* { margin: 0; padding: 0; border: 0; outline: 0; font-size: 100%; vertical-align: baseline; background: transparent; } body { background-color: #f0f0f0; // #eaf5e9; #277bc0; #d3d3f9; color: black; font-family: Verdana, Arial, sans-serif; font-size:12px; line-height: 1.2; } h1,h2,h3,h4,h5,h6 { margin-top: 10px; margin-bottom: 10px; font-weight:bold; } h1 { font-size: 140%; } h2 { font-size: 120%; } h3 { font-size: 110%; font-style: oblique; } p { margin-bottom: 0.75ex; } a:link, a:visited { color: #277bc0;/* #339;*/ font-weight:bolder; text-decoration:none; } a:hover { color: blue; font-weight:bolder; text-decoration:underline; } ul { list-style: square inside ; margin-bottom: 0.75ex; } table { border: thin solid #666; margin-top: 5px; margin-bottom: 10px; } table.nested { margin-left: 2em; } thead,tbody { border: thin solid #666; } td, th { margin: 0; padding: 2px 2px 2px 2px; } th { font-style: oblique; } h1.detail { } .header { width:100%; padding: 1em 10px 1em 10px; color: #fff; background: #5e87b0; font-weight: bold; text-shadow: 0 /*{b-bar-shadow-x}*/ 1px /*{b-bar-shadow-y}*/ 1px /*{b-bar-shadow-radius}*/ #3e6790 /*{b-bar-shadow-color}*/; text-align: center; font-size: 16px; display: block; text-overflow: ellipsis; overflow: hidden; white-space: nowrap; outline: 0 !important; } .usa-banner { padding-left: 10px; overflow: hidden; } .official-websites { float: left; width: 50%; } .secure-websites { float: left; width: 50%; } .image-left { float: left; margin-right: 10px; } .footer { width: 100%; padding: 1em 10px 1em 10px; /* color: #fff; */ color: Black; background: #5e87b0; font-weight: bold; font-size: 16px; display: table; } div.footer-item { float: left; padding-left: 1em; padding-right: 1em; } /* this does not work a.footer-item:link { all: revert; } a.footer-item:visited { all: revert; } a.footer-item:hover { all: revert; } */ .inset { margin-left: 22%; } .page { padding: 10px 3% 10px 3%; } div.indent { margin-left: 2em; } div.term { margin-top: 5px; padding-left: 5px; border-top: 1px solid #DDD; font-weight: bold; } div.definition { margin-left: 5ex; } div.value { margin-left: 5ex; } div.product { background-color: white; border: thin solid #333; padding: 10px 15px 10px 15px; margin-top: 10px; } div.parameter { margin-top: 10px; padding: 5px 10px 10px 10px; border: thin dotted #333; background-color: #ebebeb; } #toc { border: thin solid #333; background-color: #F5F5F5; padding: 10px 15px 10px 15px; margin-left: 5%; margin-right: 5%; margin-bottom: 30px; } #toc ol, ul, li { padding-left: 5ex; } #toc ol { list-style-type: decimal; list-style-position: inside; } #toc ul { list-style-type: square; list-style-position: inside; } p.version { float: right; width: 100%; margin-top: 5px; text-align: right; font-size: x-small; } p.right { float: right; text-align: right; } .box-title { font-size: 120%; font-weight:bold; text-align: center; border-bottom: 1px solid #DDD; } ul.list { list-style-position: outside; padding-left: 1.5em; } li.list { text-align: left; padding-left: 0px; } .no-break { white-space: nowrap; } p.author { font-size: 120%; } div.brand { width: 100%; text-align: right; } div.abstract { display: table; position: relative; width: 100%; } div.citation { } div.access { float: left; width: 20%; background-color: white; border: thin solid #333; padding: 5px 5px 5px 5px; margin-right: 1em; } a.xml-logo:link, a.xml-logo:visited { background: #ff6600; color: #ffffff; font-weight:bolder; text-decoration:none; padding-left:2px; padding-right:2px; } a.xml-logo:hover { text-decoration:underline; } button { background-color: #5e87b0; border: none; /* 2px solid black; */ border-radius: 8px; color: white; padding: 3px 5px; text-align: center; text-decoration: none; display: inline-block; } button.usa-banner-button { background-color: initial; border: initial; border-radius: initial; color: initial; padding: initial; text-align: initial; text-decoration: underline; display: initial; } async function getResponseText(response) { document.body.style.cursor = 'default'; return await response.text(); } function getVersionedBibTeX(bibtex) { /* Add version field as suggested by August (Gus) Muench, Journals Data Editor, American Astronomical Society (email dated 7/7/25) */ const accessVersion = ", version={Accessed on " + currentIsoDateStr + "}"; const modifiedBibtex = bibtex.substring(0, bibtex.lastIndexOf("}")) + accessVersion + "}"; return modifiedBibtex; } function getBlob(text) { return new Blob([text], { type: "text/plain"}); } function clipboardAlert(text) { alert(text + "\nCopied to clipboard"); } function clipCitation(doi) { document.body.style.cursor = 'wait'; let url = "https://citation.doi.org/format?doi=" + doi.replace("https://doi.org/", "") + String.fromCodePoint(38) + "style=bibtex" + String.fromCodePoint(38) + "lang=en-US"; const text = new ClipboardItem({ "text/plain": fetch(url) .then(getResponseText) .then(getVersionedBibTeX) .then(getBlob) }); navigator.clipboard.write([text]); text.getType("text/plain") .then(getResponseText) .then(clipboardAlert); } function toggle_usa_banner_details() { const details = document.getElementById("usa-banner-details"); const indicator = document.getElementById("usa-banner-indicator"); if (details.style.display === "none") { details.style.display = "block"; indicator.textContent = "^"; } else { details.style.display = "none"; indicator.textContent = "v"; } } const monthName=new Array("January","February","March","April","May","June","July","August","September","October","November","December"); let currentDate = new Date(); let currentIsoDateStr = currentDate.toISOString().substring(0, 10); let currentDateStr = currentDate.getFullYear() + '-' + monthName[currentDate.getMonth()] + '-' + currentDate.getDate();  An official website of the United States government Here's how you know v Official websites use .gov A .gov websites belongs to an official government organization in the United States Secure .gov website use HTTPS A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. HDPWS Data Access FTPS from the MMS SDC (not with most browsers) HTTPS from the MMS SDC FTPS from SPDF (not with most browsers) HTTPS from SPDF CDAWeb WebService: CDAWeb Programmatic Data Access HAPI: CDAWeb HAPI Server MMS 2 Fast Plasma Investigation, Dual Electron Spectrometer (FPI, DES) Instrument Distributions, Level 2 (L2), Fast Mode, 4.5 s Data var authors='Gershman, Daniel, J.; Giles, Barbara, L.; Pollock, Craig, J.; Moore, Thomas, E.; Burch, James, L.'; document.write(authors); (2022). MMS 2 Fast Plasma Investigation, Dual Electron Spectrometer (FPI, DES) Instrument Distributions, Level 2 (L2), Fast Mode, 4.5 s Data. [Data set]. Laboratory for Atmospheric and Space Physics; Space Physics Data Facility. https://doi.org/10.48322/nf79-gp85. Accessed on document.write(currentDateStr);. Note: Proper references, including Copy BibTeX Citation or other formats, should include the "Accessed on date" to identify the version of the resource being cited in a given publication. ResourceID spase://NASA/NumericalData/MMS/2/FastPlasmaInvestigation/DES/Fast/Level2/Distribution/PT4.5S Description The Fast Plasma Instrument (FPI) usually Operates in Fast Survey (FS) Mode in the MMS Region Of Interest (ROI) for the current Mission Phase. Data are taken at Burst (30/150 ms for DES/DIS) Resolution are aggregated onboard and made available at Survey (4.5 s) Resolution in this Mode. This Product contains Phase Space Distribution Maps of Results from surveying the High Resolution Observations during each 4.5 s Period. In particular, the (highest possible Quality at the Time of Release) corrected/converted "Fast Survey Sky Map" Distributions are reported with Time Stamps and other Annotation characterizing the State of the Instrument System at the indicated Time. Metadata Rights CC0-1.0: Creative Commons Zero v1.0 Universal Note CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license. View XML | Edit Details Version:2.7.1 NumericalData ResourceID spase://NASA/NumericalData/MMS/2/FastPlasmaInvestigation/DES/Fast/Level2/Distribution/PT4.5S NamingAuthority NASA ResourceType NumericalData ResourceHeader ResourceName MMS 2 Fast Plasma Investigation, Dual Electron Spectrometer (FPI, DES) Instrument Distributions, Level 2 (L2), Fast Mode, 4.5 s Data AlternateName MMS2_FPI_FAST_L2_DES-DIST DOI https://doi.org/10.48322/nf79-gp85 ReleaseDate 2025-12-04 13:30:01Z RevisionHistory RevisionEvent ReleaseDate 2021-04-27 15:38:11 Note Only known prior ReleaseDate of the metadata RevisionEvent ReleaseDate 2022-08-04 12:34:56.789 Note Added DOI and PublicationInfo minted by LFB, updated the RepositoryID, updated the SPDF MetadataContact Person to Robert M. Candey, metadata updated to SPASE 2.4.1, reviewed by LFB 20220803 RevisionEvent ReleaseDate 2023-03-04 12:34:56.789 Note Standardized the ResourceName Format, Set AlternateName equal to the ProductKey, Revised the Acknowledgement, PublicationInfo Authors, and Contact Person list per request of the MMS FPI team, metadata updated to SPASE 2.5.0, reviewed by LFB 20230304 RevisionEvent ReleaseDate 2023-03-28 12:34:56.789 Note Remove Stephen Kreisler from Author and Acknowledgment lists per request of the MMS FPI team, revised by LFB 20230328 RevisionEvent ReleaseDate 2025-10-02 15:12:10Z Note Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB RevisionEvent ReleaseDate 2025-12-04 13:30:01Z Note Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB Description The Fast Plasma Instrument (FPI) usually Operates in Fast Survey (FS) Mode in the MMS Region Of Interest (ROI) for the current Mission Phase. Data are taken at Burst (30/150 ms for DES/DIS) Resolution are aggregated onboard and made available at Survey (4.5 s) Resolution in this Mode. This Product contains Phase Space Distribution Maps of Results from surveying the High Resolution Observations during each 4.5 s Period. In particular, the (highest possible Quality at the Time of Release) corrected/converted "Fast Survey Sky Map" Distributions are reported with Time Stamps and other Annotation characterizing the State of the Instrument System at the indicated Time. Acknowledgement Please acknowledge D.J. Gershman, B.L. Giles, C.J. Pollock, T.E. Moore, and J.L. Burch for use of these data PublicationInfo Authors Gershman, Daniel, J.; Giles, Barbara, L.; Pollock, Craig, J.; Moore, Thomas, E.; Burch, James, L. PublicationDate 2022-01-01 00:00:00 PublishedBy Laboratory for Atmospheric and Space Physics; Space Physics Data Facility Contacts Role Person StartDate StopDate Note 1. InstrumentLeadCoInvestigator spase://SMWG/Person/Daniel.J.Gershman 2. InstrumentLeadCoInvestigator spase://SMWG/Person/Barbara.L.Giles Retired 3. InstrumentLeadCoInvestigator spase://SMWG/Person/Craig.J.Pollock Retired 4. InstrumentLeadCoInvestigator spase://SMWG/Person/Thomas.E.Moore Retired 5. Developer spase://SMWG/Person/Stephen.Kreisler GroundSystemLead 6. PrincipalInvestigator spase://SMWG/Person/James.L.Burch 7. HostContact spase://SMWG/Person/MMS_SDC_POC 8. MetadataContact spase://SMWG/Person/Robert.M.Candey 9. MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze InformationURL Name The Magnetospheric Multiscale (MMS) Mission home page at Goddard Space Flight Center (GSFC) URL https://mms.gsfc.nasa.gov/ Description The Magnetospheric Multiscale (MMS) Mission Home Page hosted by the Goddard Space Flight Center (GSFC). InformationURL Name The Magnetospheric Multiscale (MMS) Mission home page at Goddard Space Flight Center (GSFC) URL https://mms.gsfc.nasa.gov/ Description The Magnetospheric Multiscale (MMS) Mission Home Page hosted at the Goddard Space Flight Center (GSFC) InformationURL Name The MMS Mission home page at the Science Data Center (SDC) LASP, UC Boulder URL https://lasp.colorado.edu/mms/sdc/public/ Description The Magnetospheric Multiscale (MMS) Mission Home Page hosted by the Laboratory of Atmospheric and Space Physics, Science Data Center (LASP, SDC) at the University of Colorado, Boulder InformationURL Name NASA Web Page providing Inforamtion for the Magnetospheric Multiscale (MMS) Fast Plasma Investigation (FPI) Instrument URL https://www.nasa.gov/mission_pages/mms/spacecraft/mms-instruments.html#fpi Description NASA Web Page providing an Overview of the Magnetospheric Multiscale (MMS) Fast Plasma Investigation (FPI) Instrument PriorIDs spase://VSPO/NumericalData/MMS/2/FastPlasmaInvestigation/DES/Burst/Level2/Distribution/PT4.5S spase://VSPO/NumericalData/MMS/2/FastPlasmaInvestigation/DES/Fast/Level2/Distribution/PT4.5S AccessInformation RepositoryID spase://SMWG/Repository/UCOLO/LASP/MMS_SDC Availability Online AccessRights Open AccessURL Name FTPS from the MMS SDC (not with most browsers) URL ftps://lasp.colorado.edu/mms/sdc/public/data/mms2/fpi/fast/l2/des-dist/ Description In CDF via ftp from the MMS Science Data Center AccessURL Name HTTPS from the MMS SDC URL https://lasp.colorado.edu/mms/sdc/public/data/mms2/fpi/fast/l2/des-dist/ Description In CDF via http from the MMS Science Data Center Format CDF Encoding None Acknowledgement Please acknowledge D.J. Gershman, B.L. Giles, C.J. Pollock, T.E. Moore, and J.L. Burch. Also please acknowledge the data providers and CDAWeb when using these data. AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Availability Online AccessRights Open RightsList Rights SchemeURI https://spdx.org/licenses/ RightsIdentifierScheme SPDX RightsIdentifier CC0-1.0 RightsURI https://spdx.org/licenses/CC0-1.0.html RightsName Creative Commons Zero v1.0 Universal Note CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products AccessURL Name FTPS from SPDF (not with most browsers) URL ftps://spdf.gsfc.nasa.gov/pub/data/mms/mms2/fpi/fast/l2/des-dist/ Description In CDF via ftp from SPDF AccessURL Name HTTPS from SPDF URL https://spdf.gsfc.nasa.gov/pub/data/mms/mms2/fpi/fast/l2/des-dist/ Description In CDF via http from SPDF AccessURL Name CDAWeb URL https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=MMS2_FPI_FAST_L2_DES-DIST&index=sp_phys ProductKey MMS2_FPI_FAST_L2_DES-DIST Description Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb Format CDF Encoding None AccessDirectoryTemplate https://cdaweb.gsfc.nasa.gov/pub/data/mms/mms2/fpi/fast/l2/des-dist/$Y/$m AccessFilenameTemplate mms2_fpi_fast_l2_des-dist_$Y$m$d$H$M$S_$v.cdf Acknowledgement Please acknowledge D.J. Gershman, B.L. Giles, C.J. Pollock, T.E. Moore, and J.L. Burch. Also please acknowledge the data providers and CDAWeb when using these data. AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF Availability Online AccessRights Open AccessURL Name CDAWeb Programmatic Data Access URL https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/MMS2_FPI_FAST_L2_DES-DIST/clientLibraryExample/ Style WebService ProductKey MMS2_FPI_FAST_L2_DES-DIST Description Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS. Format Binary Acknowledgement Please acknowledge D.J. Gershman, B.L. Giles, C.J. Pollock, T.E. Moore, and J.L. Burch. Also please acknowledge the data providers and CDAWeb when using these data. AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Availability Online AccessRights Open RightsList Rights SchemeURI https://spdx.org/licenses/ RightsIdentifierScheme SPDX RightsIdentifier CC0-1.0 RightsURI https://spdx.org/licenses/CC0-1.0.html RightsName Creative Commons Zero v1.0 Universal Note CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products AccessURL Name CDAWeb HAPI Server URL https://cdaweb.gsfc.nasa.gov/hapi Style HAPI ProductKey MMS2_FPI_FAST_L2_DES-DIST Description Web Service to this product using the HAPI interface Format CSV Acknowledgement Please acknowledge D.J. Gershman, B.L. Giles, C.J. Pollock, T.E. Moore, and J.L. Burch. Also please acknowledge the data providers and CDAWeb when using these data. ProcessingLevel Calibrated InstrumentIDs spase://SMWG/Instrument/MMS/1/FastPlasmaInstrument/DES MeasurementType EnergeticParticles TemporalDescription TimeSpan StartDate 2015-06-22 00:00:00.000 StopDate 2018-09-16 23:59:59.999 Cadence PT4.5S ObservedRegion Earth.Magnetosheath ObservedRegion Earth.Magnetosphere ObservedRegion Earth.Magnetosphere.Magnetotail ObservedRegion Earth.Magnetosphere.Main ObservedRegion Earth.Magnetosphere.RadiationBelt ObservedRegion Earth.NearSurface.EquatorialRegion ObservedRegion Earth.NearSurface.Plasmasphere ObservedRegion Heliosphere.NearEarth Caveats This SPASE Numerical Data Description is for the MMS2_FPI_FAST_L2_DES-DIST Data Product. This Numerical Data Description has been written by utilizing the ADAPT Software Package. ADAPT can harvest Metadata that are embedded in Data Files stored in Common Data File Format that are then leveraged to populate corresponding SPASE Schema Text Fields. Typically, the CDF embedded Metadata are harvested from CDF Master Files, which contain no actual Data, in order to populate SPASE Documents. In this case, the Metadata were harvested from a "Data" CDF, which contains actual Data Observations from one of the four MMS FPI Instruments. The "Data" CDF used by ADAPT has the following Specifications: Data Product Version Number: 3.3.0, CDF Generation Date: 2018-11-02T19:05:20, CDF Skeleton Version Revision Number: 8026, and CDF Skeleton Version Revision Date: 2017-05-26T15:45:00. Parameter #1 Name Epoch Time ParameterKey Epoch Description Epoch Time Tags in Terrestrial Time 2000 (TT2000), Nanoseconds since J2000 Caveats Fast Survey Data Begin Time, derived from the Fast Survey Packet Time. This Parameter exhibits an increasing Monotonic Progression. Cadence PT4.5S Units ns UnitsConversion 1.0e-9>s RenderingHints AxisLabel Epoch ScaleType LinearScale ValidMin 1990-01-01T00:00:00.000000000 ValidMax 2100-01-01T00:00:01.000000000 FillValue 9999-12-31T23:59:59.999999999 Support SupportQuantity Temporal Parameter #2 Name Epoch Plus Var ParameterKey Epoch_plus_var Description Epoch Plus Var Cadence PT4.5S Units s UnitsConversion 1.0>s RenderingHints ValueFormat F4.2 ValidMin 0.0 ValidMax 4.5 Support SupportQuantity Temporal Parameter #3 Name Epoch Minus Var ParameterKey Epoch_minus_var Description Epoch Minus Var Cadence PT4.5S Units s UnitsConversion 1.0>s RenderingHints ValueFormat F4.2 ValidMin 0.0 ValidMax 4.5 Support SupportQuantity Temporal Parameter #4 Name Data Quality Error Flags Set Time Series defined by using: EPOCH ParameterKey mms2_des_errorflags_fast Description Vector of Data Quality Indicator Flag Flags at Survey Start Time Caveats A Value of Zero signifies no Quality Errors. For Non-Zero Values: Bit-0=Manually flagged Interval, Bit-1=Overcounting/Saturation Effects likely present in Sky Map, Bit-2=Compression Pipeline Error Cadence PT4.5S RenderingHints DisplayType TimeSeries AxisLabel Error_Flags ValueFormat I10 ScaleType LinearScale ValidMin 0 ValidMax 4294967294 FillValue 4294967295 Support SupportQuantity Other Parameter #5 Name Compression Flag ParameterKey mms2_des_compressionloss_fast Description Compression Lossless/Lossy Indicator Flag at Survey Start Time Caveats Compression Loss Indicator, 0=Lossless, 1=Lossy Cadence PT4.5S RenderingHints DisplayType TimeSeries AxisLabel Compress_Flag ValueFormat I1 ScaleType LinearScale ValidMin 0 ValidMax 1 FillValue 255 Support SupportQuantity Other Parameter #6 Name Start Del-Phi Count Set Time Series defined by using: EPOCH ParameterKey mms2_des_startdelphi_count_fast Description Del-Phi (Observatory Spin Phase) Count at Survey Start Time Caveats Nominally, the Spin Phase Counts range over [0000,5759] Counts. Each Count represents 1/16 of a Degree (0.0625°) of Observatory Spin Phase. Zero Spin Phase Angle indicates that the Observatory +X-axis is aligned with the Sun Sensor Axis. Cadence PT4.5S RenderingHints DisplayType TimeSeries AxisLabel DelPhi_Count ValueFormat I4.4 ScaleType LinearScale ValidMin 0 ValidMax 5761 FillValue 65535 Support SupportQuantity Other Parameter #7 Name Start Del-Phi Angle Set Time Series defined by using: EPOCH ParameterKey mms2_des_startdelphi_angle_fast Description Del-Phi (Observatory Spin Phase) Angle at Survey Start Time Caveats Nominally, the Spin Phase Angles range over [0°,360°). Each Count represents 1/16 of a Degree (0.0625°) of Observatory Spin Phase. Zero Spin Phase Angle indicates that the Observatory +X-axis is aligned with the Sun Sensor Axis. Cadence PT4.5S Units ° UnitsConversion 0.0174532925>rad RenderingHints DisplayType TimeSeries AxisLabel DelPhi_Angle ValueFormat E12.2 ScaleType LinearScale ValidMin 0.0 ValidMax 360.0 FillValue -1.0e+31 Support Qualifier DirectionAngle.AzimuthAngle Qualifier PhaseAngle SupportQuantity Positional Parameter #8 Name Electron Sky Map Distribution Set Time Series defined by using: EPOCH ParameterKey mms2_des_dist_fast Description Electron Fast Survey Sky Map Instrument Distribution. Column 1 Labels from MMS2_DES_PHI_FAST: ["2.7500 deg","14.000 deg","25.250 deg","36.500 deg","47.750 deg","59.000 deg","70.250 deg","81.500 deg","92.750 deg","104.00 deg","115.25 deg","126.50 deg","137.75 deg","149.00 deg","160.25 deg","171.50 deg","182.75 deg","194.00 deg","205.25 deg","216.50 deg","227.75 deg","239.00 deg","250.25 deg","261.50 deg","272.75 deg","284.00 deg","295.25 deg","306.50 deg","317.75 deg","329.00 deg","340.25 deg","351.50 deg"]. Column 2 Labels from MMS2_DES_THETA_FAST: ["5.6250 deg","16.875 deg","28.125 deg","39.375 deg","50.625 deg","61.875 deg","73.125 deg","84.375 deg","95.625 deg","106.88 deg","118.13 deg","129.38 deg","140.63 deg","151.88 deg","163.13 deg","174.38 deg"]. Column 3 Labels from MMS2_DES_ENERGY_FAST: ["energy00","energy01","energy02","energy03","energy04","energy05","energy07","energy07","energy08","energy09","energy10","energy11","energy12","energy13","energy14","energy15","energy16","energy17","energy18","energy19","energy20","energy21","energy22","energy23","energy24","energy25","energy26","energy27","energy28","energy29","energy30","energy31"]. Caveats Azimuth Bin: Sector Index=00 looks "after" (Spin Phase) the Sun Direction, ..., Sector Index=31 looks "before" the Sun Direction. Head Field of View: Pixel Index=00 looks to Zenith, ..., Pixel Index=15 looks to Nadir. FPI Operations nominally bin Data from 64 Energy Filters into 32 pairwise Energy Bins, indexed 00-31. Nominally, Bins are indexed in increasing Energy Order. See the FPI Documents for Details. Cadence PT4.5S Units s^3/cm^6 UnitsConversion 1.0e12>s^3/m^6 RenderingHints DisplayType Spectrogram ValueFormat E12.2 ScaleType LogScale Structure Size 32 16 32 FillValue -1.0e+31 Particle ParticleType Electron Qualifier Array ParticleQuantity PhaseSpaceDensity EnergyRange Low 0.0 High 32000.0 Units eV Bin BandName Energy 00, Bin Center 6.52 eV Low 5.51 High 7.53 Bin BandName Energy 01, Bin Center 8.54 eV Low 7.53 High 9.55 Bin BandName Energy 02, Bin Center 11.2 eV Low 9.57 High 12.83 Bin BandName Energy 03, Bin Center 14.6 eV Low 12.78 High 16.42 Bin BandName Energy 04, Bin Center 19.1 eV Low 16.4 High 21.8 Bin BandName Energy 05, Bin Center 25.1 eV Low 21.88 High 28.32 Bin BandName Energy 06, Bin Center 32.8 eV Low 28.27 High 37.33 Bin BandName Energy 07, Bin Center 43.0 eV Low 37.39 High 48.61 Bin BandName Energy 08, Bin Center 56.2 eV Low 48.54 High 63.86 Bin BandName Energy 09, Bin Center 73.6 eV Low 63.88 High 83.32 Bin BandName Energy 10, Bin Center 96.3 eV Low 83.3 High 109.3 Bin BandName Energy 11, Bin Center 126.0 eV Low 109.3 High 142.7 Bin BandName Energy 12, Bin Center 165.0 eV Low 142.8 High 187.2 Bin BandName Energy 13, Bin Center 216.0 eV Low 187.2 High 244.8 Bin BandName Energy 14, Bin Center 283.0 eV Low 245.0 High 321.0 Bin BandName Energy 15, Bin Center 370.0 eV Low 320.6 High 419.4 Bin BandName Energy 16, Bin Center 485.0 eV Low 420.0 High 550.0 Bin BandName Energy 17, Bin Center 635.0 eV Low 550.2 High 719.8 Bin BandName Energy 18, Bin Center 831.0 eV Low 720.0 High 942.0 Bin BandName Energy 19, Bin Center 1090.0 eV Low 945.0 High 1235.0 Bin BandName Energy 20, Bin Center 1420.0 eV Low 1229.0 High 1611.0 Bin BandName Energy 21, Bin Center 1860.0 eV Low 1611.0 High 2109.0 Bin BandName Energy 22, Bin Center 2440.0 eV Low 2113.0 High 2767.0 Bin BandName Energy 23, Bin Center 3190.0 eV Low 2763.0 High 3617.0 Bin BandName Energy 24, Bin Center 4180.0 eV Low 3621.0 High 4739.0 Bin BandName Energy 25, Bin Center 5470.0 eV Low 4738.0 High 6202.0 Bin BandName Energy 26, Bin Center 7160.0 eV Low 6201.0 High 8119.0 Bin BandName Energy 27, Bin Center 9370.0 eV Low 8120.0 High 10620.0 Bin BandName Energy 28, Bin Center 12300.0 eV Low 10660.0 High 13940.0 Bin BandName Energy 29, Bin Center 16100.0 eV Low 13950.0 High 18250.0 Bin BandName Energy 30, Bin Center 21000.0 eV Low 18190.0 High 23810.0 Bin BandName Energy 31, Bin Center 27500.0 eV Low 23820.0 High 31180.0 AzimuthalAngleRange Low 0.0 High 360.0 Units ° Bin BandName Sector 00, 5.625° Bin Center Low 0.0 High 11.25 Bin BandName Sector 01, 16.875° Bin Center Low 11.25 High 22.5 Bin BandName Sector 02, 28.125° Bin Center Low 22.5 High 33.75 Bin BandName Sector 03, 39.375° Bin Center Low 33.75 High 45.0 Bin BandName Sector 04, 50.625° Bin Center Low 45.0 High 56.25 Bin BandName Sector 05, 61.875° Bin Center Low 56.25 High 67.5 Bin BandName Sector 06, 73.125° Bin Center Low 67.5 High 78.75 Bin BandName Sector 07, 84.375° Bin Center Low 78.75 High 90.0 Bin BandName Sector 08, 95.625° Bin Center Low 90.0 High 101.25 Bin BandName Sector 09, 106.875° Bin Center Low 101.25 High 112.5 Bin BandName Sector 10, 118.125° Bin Center Low 112.5 High 123.75 Bin BandName Sector 11, 129.375° Bin Center Low 123.75 High 135.0 Bin BandName Sector 12, 140.625° Bin Center Low 135.0 High 146.25 Bin BandName Sector 13, 151.875° Bin Center Low 146.25 High 157.5 Bin BandName Sector 14, 163.125° Bin Center Low 157.5 High 168.75 Bin BandName Sector 15, 174.375° Bin Center Low 168.75 High 180.0 Bin BandName Sector 16, 185.625° Bin Center Low 180.0 High 191.25 Bin BandName Sector 17, 196.875° Bin Center Low 191.25 High 202.5 Bin BandName Sector 18, 208.125° Bin Center Low 202.5 High 213.75 Bin BandName Sector 19, 219.375° Bin Center Low 213.75 High 225.0 Bin BandName Sector 20, 230.625° Bin Center Low 225.0 High 236.25 Bin BandName Sector 21, 241.875° Bin Center Low 236.25 High 247.5 Bin BandName Sector 22, 253.125° Bin Center Low 247.5 High 258.75 Bin BandName Sector 23, 264.375° Bin Center Low 258.75 High 270.0 Bin BandName Sector 24, 275.625° Bin Center Low 270.0 High 281.25 Bin BandName Sector 25, 286.875° Bin Center Low 281.25 High 292.5 Bin BandName Sector 26, 298.125° Bin Center Low 292.5 High 303.75 Bin BandName Sector 27, 309.375° Bin Center Low 303.75 High 315.0 Bin BandName Sector 28, 320.625° Bin Center Low 315.0 High 326.25 Bin BandName Sector 29, 331.875° Bin Center Low 326.25 High 337.5 Bin BandName Sector 30, 343.125° Bin Center Low 337.5 High 348.75 Bin BandName Sector 31, 354.375° Bin Center Low 348.75 High 360.0 PolarAngleRange Low 0.0 High 180.0 Units ° Bin BandName Pixel 00, 5.625° Bin Center Low 0.0 High 11.25 Bin BandName Pixel 01, 16.875° Bin Center Low 11.25 High 22.5 Bin BandName Pixel 02, 28.125° Bin Center Low 22.5 High 33.75 Bin BandName Pixel 03, 39.375° Bin Center Low 33.75 High 45.0 Bin BandName Pixel 04, 50.625° Bin Center Low 45.0 High 56.25 Bin BandName Pixel 05, 61.875° Bin Center Low 56.25 High 67.5 Bin BandName Pixel 06, 73.125° Bin Center Low 67.5 High 78.75 Bin BandName Pixel 07, 84.375° Bin Center Low 78.75 High 90.0 Bin BandName Pixel 08, 95.625° Bin Center Low 90.0 High 101.25 Bin BandName Pixel 09, 106.875° Bin Center Low 101.25 High 112.5 Bin BandName Pixel 10, 118.125° Bin Center Low 112.5 High 123.75 Bin BandName Pixel 11, 129.375° Bin Center Low 123.75 High 135.0 Bin BandName Pixel 12, 140.625° Bin Center Low 135.0 High 146.25 Bin BandName Pixel 13, 151.875° Bin Center Low 146.25 High 157.5 Bin BandName Pixel 14, 163.125° Bin Center Low 157.5 High 168.75 Bin BandName Pixel 15, 174.375° Bin Center Low 168.75 High 180.0 Parameter #9 Name Electron Sky Map Distribution, Error Set Time Series defined by using: EPOCH ParameterKey mms2_des_disterr_fast Description Electron Fast Survey Sky Map Instrument Distribution, 1-sigma Error. Column 1 Labels from MMS2_DES_PHI_FAST: ["2.7500 deg","14.000 deg","25.250 deg","36.500 deg","47.750 deg","59.000 deg","70.250 deg","81.500 deg","92.750 deg","104.00 deg","115.25 deg","126.50 deg","137.75 deg","149.00 deg","160.25 deg","171.50 deg","182.75 deg","194.00 deg","205.25 deg","216.50 deg","227.75 deg","239.00 deg","250.25 deg","261.50 deg","272.75 deg","284.00 deg","295.25 deg","306.50 deg","317.75 deg","329.00 deg","340.25 deg","351.50 deg"]. Column 2 Labels from MMS2_DES_THETA_FAST: ["5.6250 deg","16.875 deg","28.125 deg","39.375 deg","50.625 deg","61.875 deg","73.125 deg","84.375 deg","95.625 deg","106.88 deg","118.13 deg","129.38 deg","140.63 deg","151.88 deg","163.13 deg","174.38 deg"]. Column 3 Labels from MMS2_DES_ENERGY_FAST: ["energy00","energy01","energy02","energy03","energy04","energy05","energy07","energy07","energy08","energy09","energy10","energy11","energy12","energy13","energy14","energy15","energy16","energy17","energy18","energy19","energy20","energy21","energy22","energy23","energy24","energy25","energy26","energy27","energy28","energy29","energy30","energy31"]. Caveats Azimuth Bin: Sector Index=00 looks "after" (Spin Phase) the Sun Direction, ..., Sector Index=31 looks "before" the Sun Direction. Head Field of View: Pixel Index=00 looks to Zenith, ..., Pixel Index=15 looks to Nadir. FPI Operations nominally bin Data from 64 Energy Filters into 32 pairwise Energy Bins, indexed 00-31. Nominally, Bins are indexed in increasing Energy Order. See the FPI Documents for Details. Cadence PT4.5S Units s^3/cm^6 UnitsConversion 1.0e12>s^3/m^6 RenderingHints DisplayType Spectrogram ValueFormat E12.2 ScaleType LogScale Structure Size 32 16 32 FillValue -1.0e+31 Particle ParticleType Electron Qualifier Array Qualifier Uncertainty ParticleQuantity PhaseSpaceDensity EnergyRange Low 0.0 High 32000.0 Units eV Bin BandName Energy 00, Bin Center 6.52 eV Low 5.51 High 7.53 Bin BandName Energy 01, Bin Center 8.54 eV Low 7.53 High 9.55 Bin BandName Energy 02, Bin Center 11.2 eV Low 9.57 High 12.83 Bin BandName Energy 03, Bin Center 14.6 eV Low 12.78 High 16.42 Bin BandName Energy 04, Bin Center 19.1 eV Low 16.4 High 21.8 Bin BandName Energy 05, Bin Center 25.1 eV Low 21.88 High 28.32 Bin BandName Energy 06, Bin Center 32.8 eV Low 28.27 High 37.33 Bin BandName Energy 07, Bin Center 43.0 eV Low 37.39 High 48.61 Bin BandName Energy 08, Bin Center 56.2 eV Low 48.54 High 63.86 Bin BandName Energy 09, Bin Center 73.6 eV Low 63.88 High 83.32 Bin BandName Energy 10, Bin Center 96.3 eV Low 83.3 High 109.3 Bin BandName Energy 11, Bin Center 126.0 eV Low 109.3 High 142.7 Bin BandName Energy 12, Bin Center 165.0 eV Low 142.8 High 187.2 Bin BandName Energy 13, Bin Center 216.0 eV Low 187.2 High 244.8 Bin BandName Energy 14, Bin Center 283.0 eV Low 245.0 High 321.0 Bin BandName Energy 15, Bin Center 370.0 eV Low 320.6 High 419.4 Bin BandName Energy 16, Bin Center 485.0 eV Low 420.0 High 550.0 Bin BandName Energy 17, Bin Center 635.0 eV Low 550.2 High 719.8 Bin BandName Energy 18, Bin Center 831.0 eV Low 720.0 High 942.0 Bin BandName Energy 19, Bin Center 1090.0 eV Low 945.0 High 1235.0 Bin BandName Energy 20, Bin Center 1420.0 eV Low 1229.0 High 1611.0 Bin BandName Energy 21, Bin Center 1860.0 eV Low 1611.0 High 2109.0 Bin BandName Energy 22, Bin Center 2440.0 eV Low 2113.0 High 2767.0 Bin BandName Energy 23, Bin Center 3190.0 eV Low 2763.0 High 3617.0 Bin BandName Energy 24, Bin Center 4180.0 eV Low 3621.0 High 4739.0 Bin BandName Energy 25, Bin Center 5470.0 eV Low 4738.0 High 6202.0 Bin BandName Energy 26, Bin Center 7160.0 eV Low 6201.0 High 8119.0 Bin BandName Energy 27, Bin Center 9370.0 eV Low 8120.0 High 10620.0 Bin BandName Energy 28, Bin Center 12300.0 eV Low 10660.0 High 13940.0 Bin BandName Energy 29, Bin Center 16100.0 eV Low 13950.0 High 18250.0 Bin BandName Energy 30, Bin Center 21000.0 eV Low 18190.0 High 23810.0 Bin BandName Energy 31, Bin Center 27500.0 eV Low 23820.0 High 31180.0 AzimuthalAngleRange Low 0.0 High 360.0 Units ° Bin BandName Sector 00, 5.625° Bin Center Low 0.0 High 11.25 Bin BandName Sector 01, 16.875° Bin Center Low 11.25 High 22.5 Bin BandName Sector 02, 28.125° Bin Center Low 22.5 High 33.75 Bin BandName Sector 03, 39.375° Bin Center Low 33.75 High 45.0 Bin BandName Sector 04, 50.625° Bin Center Low 45.0 High 56.25 Bin BandName Sector 05, 61.875° Bin Center Low 56.25 High 67.5 Bin BandName Sector 06, 73.125° Bin Center Low 67.5 High 78.75 Bin BandName Sector 07, 84.375° Bin Center Low 78.75 High 90.0 Bin BandName Sector 08, 95.625° Bin Center Low 90.0 High 101.25 Bin BandName Sector 09, 106.875° Bin Center Low 101.25 High 112.5 Bin BandName Sector 10, 118.125° Bin Center Low 112.5 High 123.75 Bin BandName Sector 11, 129.375° Bin Center Low 123.75 High 135.0 Bin BandName Sector 12, 140.625° Bin Center Low 135.0 High 146.25 Bin BandName Sector 13, 151.875° Bin Center Low 146.25 High 157.5 Bin BandName Sector 14, 163.125° Bin Center Low 157.5 High 168.75 Bin BandName Sector 15, 174.375° Bin Center Low 168.75 High 180.0 Bin BandName Sector 16, 185.625° Bin Center Low 180.0 High 191.25 Bin BandName Sector 17, 196.875° Bin Center Low 191.25 High 202.5 Bin BandName Sector 18, 208.125° Bin Center Low 202.5 High 213.75 Bin BandName Sector 19, 219.375° Bin Center Low 213.75 High 225.0 Bin BandName Sector 20, 230.625° Bin Center Low 225.0 High 236.25 Bin BandName Sector 21, 241.875° Bin Center Low 236.25 High 247.5 Bin BandName Sector 22, 253.125° Bin Center Low 247.5 High 258.75 Bin BandName Sector 23, 264.375° Bin Center Low 258.75 High 270.0 Bin BandName Sector 24, 275.625° Bin Center Low 270.0 High 281.25 Bin BandName Sector 25, 286.875° Bin Center Low 281.25 High 292.5 Bin BandName Sector 26, 298.125° Bin Center Low 292.5 High 303.75 Bin BandName Sector 27, 309.375° Bin Center Low 303.75 High 315.0 Bin BandName Sector 28, 320.625° Bin Center Low 315.0 High 326.25 Bin BandName Sector 29, 331.875° Bin Center Low 326.25 High 337.5 Bin BandName Sector 30, 343.125° Bin Center Low 337.5 High 348.75 Bin BandName Sector 31, 354.375° Bin Center Low 348.75 High 360.0 PolarAngleRange Low 0.0 High 180.0 Units ° Bin BandName Pixel 00, 5.625° Bin Center Low 0.0 High 11.25 Bin BandName Pixel 01, 16.875° Bin Center Low 11.25 High 22.5 Bin BandName Pixel 02, 28.125° Bin Center Low 22.5 High 33.75 Bin BandName Pixel 03, 39.375° Bin Center Low 33.75 High 45.0 Bin BandName Pixel 04, 50.625° Bin Center Low 45.0 High 56.25 Bin BandName Pixel 05, 61.875° Bin Center Low 56.25 High 67.5 Bin BandName Pixel 06, 73.125° Bin Center Low 67.5 High 78.75 Bin BandName Pixel 07, 84.375° Bin Center Low 78.75 High 90.0 Bin BandName Pixel 08, 95.625° Bin Center Low 90.0 High 101.25 Bin BandName Pixel 09, 106.875° Bin Center Low 101.25 High 112.5 Bin BandName Pixel 10, 118.125° Bin Center Low 112.5 High 123.75 Bin BandName Pixel 11, 129.375° Bin Center Low 123.75 High 135.0 Bin BandName Pixel 12, 140.625° Bin Center Low 135.0 High 146.25 Bin BandName Pixel 13, 151.875° Bin Center Low 146.25 High 157.5 Bin BandName Pixel 14, 163.125° Bin Center Low 157.5 High 168.75 Bin BandName Pixel 15, 174.375° Bin Center Low 168.75 High 180.0 Parameter #10 Name Electron Sky Map Zenith Angle, Theta ParameterKey mms2_des_theta_fast Description Electron Fast Survey Sky Map Zenith Angle, Theta Caveats Pixel Zenith Angles, i.e., the Polar Angle of the Instrument Look Direction Cadence PT4.5S Units ° UnitsConversion 0.0174532925>rad RenderingHints AxisLabel Theta ValueFormat E12.2 ScaleType LinearScale Structure Size 16 ValidMin 0.0 ValidMax 180.0 FillValue -1.0e+31 Support Qualifier DirectionAngle.PolarAngle SupportQuantity Positional Parameter #11 Name Electron Sky Map Zenith Angle, Theta, Delta Value ParameterKey mms2_des_theta_delta_fast Description Electron Fast Survey Sky Map Zenith Angle, Theta, Bin Delta Value Caveats Pixel Zenith Angle Deltas Cadence PT4.5S Units ° UnitsConversion 0.0174532925>rad RenderingHints AxisLabel Delta_Theta ValueFormat E10.3 ScaleType LinearScale Structure Size 16 ValidMin 0.0 ValidMax 10.0 FillValue -1.0e+31 Support Qualifier DirectionAngle.PolarAngle SupportQuantity Positional Parameter #12 Name Electron Sky Map Energy Set Time Series defined by using: EPOCH ParameterKey mms2_des_energy_fast Description Electron Fast Survey Sky Map Energy Caveats Geometric Mean of Parity 0 and Parity 1 Energies in the 64-step FPI Energy Table Cadence PT4.5S Units eV UnitsConversion 1.602176565e-19>J RenderingHints AxisLabel Energy ValueFormat E12.2 ScaleType LogScale Structure Size 32 ValidMin 0.0 ValidMax 32000.0 FillValue -1.0e+31 Particle ParticleType Electron Qualifier Array ParticleQuantity Energy Parameter #13 Name Electron Sky Map Energy, Delta Value Set Time Series defined by using: EPOCH ParameterKey mms2_des_energy_delta_fast Description Electron Fast Survey Sky Map Energy, Delta Value Caveats Note that the Deltas are provided to indicate that the FPI is reporting the Energy Bin Centers. The Deltas do not necessarily reflect the Energy Bandwidth that is sampled by the FPI for a given Energy Step. Cadence PT4.5S Units eV UnitsConversion 1.602176565e-19>J RenderingHints AxisLabel Delta_Energy ValueFormat E12.2 ScaleType LogScale Structure Size 32 ValidMin 0.0 ValidMax 5000.0 FillValue -1.0e+31 Particle ParticleType Electron Qualifier Array ParticleQuantity Energy Parameter #14 Name Electron Sky Map Azimuth Angle, Phi ParameterKey mms2_des_phi_fast Description Fast Survey Sky Map Azimuth Angle, Phi Caveats Azimuth Angles in the Instrument Frame, i.e., the Azimuthal Angle of the Instrument Look Direction Cadence PT4.5S Units ° UnitsConversion 0.0174532925>rad RenderingHints AxisLabel Phi ValueFormat E12.2 ScaleType LinearScale Structure Size 32 ValidMin 0.0 ValidMax 360.0 FillValue -1.0e+31 Support Qualifier DirectionAngle.AzimuthAngle SupportQuantity Positional Parameter #15 Name Electron Sky Map Azimuth Angle, Phi, Delta Value ParameterKey mms2_des_phi_delta_fast Description Electron Fast Survey Sky Map Azimuth Angle, Phi, Bin Delta Value Caveats Azimuth Angle Deltas Cadence PT4.5S Units ° UnitsConversion 0.0174532925>rad RenderingHints AxisLabel Delta_Phi ValueFormat E12.2 ScaleType LinearScale Structure Size 32 ValidMin 0.0 ValidMax 360.0 FillValue -1.0e+31 Support Qualifier DirectionAngle.AzimuthAngle SupportQuantity Positional Contact SPDF: NASA-SPDF Feedback/Support Responsible NASA Official: Robert M. Candey Site Editor: Tami Kovalick SPDF ROR ID SPDF re3data ID About NASA Accessibility FOIA No FEAR Act Privacy Policy Vulnerability Disclosure Policy Last Updated: 2025-12-04