Name: ACE Solar Wind Electron, Proton, and Alpha Monitor (SWEPAM) Plasma Moments, Level 2 (H2), 1 h Data
Creator: McComas, D., Skoug, R., Delapp, D., Elliott, H., and Davis, A.
Published: 2022-04-27
License: https://spdx.org/licenses/CC0-1.0.html

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} 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(); Data Access FTPS from SPDF (not with most browsers) HTTPS from SPDF CDAWeb WebService: CDAWeb Programmatic Data Access HAPI: CDAWeb HAPI Server ACE Solar Wind Electron, Proton, and Alpha Monitor (SWEPAM) Plasma Moments, Level 2 (H2), 1 h Data var authors='McComas, D., Skoug, R., Delapp, D., Elliott, H., and Davis, A.'; document.write(authors); (2022). ACE Solar Wind Electron, Proton, and Alpha Monitor (SWEPAM) Plasma Moments, Level 2 (H2), 1 h Data. [Data set]. Space Physics Data Facility. https://doi.org/10.48322/9w01-2555. 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/ACE/SWEPAM/L2/PT1H Description This Data Product contains Measurements from the ACE Solar Wind Electron Proton Alpha Monitor (SWEPAM) Instrument. The Quality of the ACE Level 2 Data are such that it is suitable for serious Scientific Study. However, to avoid Confusion and Misunderstanding, it is recommended that Users consult with the appropriate ACE Team Members before publishing Work derived from the Data. The ACE Team has worked hard to ensure that the Level 2 Data are free from Errors, but the Team cannot accept Responsibility for erroneous Data, or for Misunderstandings about how the Data may be used. This is especially true if the appropriate ACE Team Members are not consulted before Publication. At the very least, Preprints should be forwarded to the ACE Team before Publication. SWEPAM References: https://izw1.caltech.edu/ACE/ 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/ACE/SWEPAM/L2/PT1H NamingAuthority NASA ResourceType NumericalData ResourceHeader ResourceName ACE Solar Wind Electron, Proton, and Alpha Monitor (SWEPAM) Plasma Moments, Level 2 (H2), 1 h Data DOI https://doi.org/10.48322/9w01-2555 ReleaseDate 2025-12-04 13:28:25Z RevisionHistory RevisionEvent ReleaseDate 2021-04-27 15:38:11 Note Last known prior metadata Release Date RevisionEvent ReleaseDate 2022-04-20 12:34:56.789 Note ACE: DOI and PublicationInfo added, metadata revised by J.M. Weygand on 2022-04-08, reviewed by LFB RevisionEvent ReleaseDate 2022-05-17 12:34:56.789 Note ACE: Updated to SPASE Version 2.4.0, three InformationURL URLs updated, revised by LFB on 2022-05-17 RevisionEvent ReleaseDate 2025-09-30 14:27:19Z 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 13:28:25Z Note Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB Description This Data Product contains Measurements from the ACE Solar Wind Electron Proton Alpha Monitor (SWEPAM) Instrument. The Quality of the ACE Level 2 Data are such that it is suitable for serious Scientific Study. However, to avoid Confusion and Misunderstanding, it is recommended that Users consult with the appropriate ACE Team Members before publishing Work derived from the Data. The ACE Team has worked hard to ensure that the Level 2 Data are free from Errors, but the Team cannot accept Responsibility for erroneous Data, or for Misunderstandings about how the Data may be used. This is especially true if the appropriate ACE Team Members are not consulted before Publication. At the very least, Preprints should be forwarded to the ACE Team before Publication. SWEPAM References: https://izw1.caltech.edu/ACE/ Acknowledgement D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. See the Rules Of Use available from the ACE Science Center at: http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. PublicationInfo Authors McComas, D., Skoug, R., Delapp, D., Elliott, H., and Davis, A. PublicationDate 2022-04-27 00:00:00 PublishedBy Space Physics Data Facility Contacts Role Person StartDate StopDate Note 1. PrincipalInvestigator spase://SMWG/Person/David.J.McComas 2. DataProducer spase://SMWG/Person/Ruth.Skoug 3. MetadataContact spase://SMWG/Person/Robert.E.McGuire 4. MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze InformationURL Name ACE Science Center Home Page for Level 2 Data Release Notes URL https://izw1.caltech.edu/ACE/ASC/level2/index.html Description ACE Level 2 Data Release Notes Home Page InformationURL Name ACE Science Center Home Page for Level 2 Rules of Use URL https://izw1.caltech.edu/ACE/ASC/level2/policy_lvl2.html Description ACE Level 2 Rules of Use Home Page InformationURL Name ACE SWEPAM Instrument Description URL https://doi.org/10.1023/A:1005040232597 Description McComas, D.J., Bame, S.J., Barker, P., Feldman, W.C., Phillips, J.L., Riley, P., and J.W. Griffee, Solar Wind Electron Proton Alpha Monitor (SWEPAM) for the Advanced Composition Explorer, Space Sci. Rev., 86, 563–612, 1998 PriorIDs spase://VSPO/NumericalData/ACE/SWEPAM/L2/PT3600S spase://VSPO/NumericalData/P_ACE_HDR_SWEPAM_1HR spase://VSPO/NumericalData/ACE/SWEPAM/L2/PT1H AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF 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/ace/swepam/level_2_cdaweb/swe_h2/ Description Access to Data in CDF Format via ftp from SPDF AccessURL Name HTTPS from SPDF URL https://spdf.gsfc.nasa.gov/pub/data/ace/swepam/level_2_cdaweb/swe_h2/ Description Access to Data in CDF Format via http from SPDF AccessURL Name CDAWeb URL https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=AC_H2_SWE&index=sp_phys ProductKey AC_H2_SWE Description Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb Format CDF Encoding None AccessDirectoryTemplate https://cdaweb.gsfc.nasa.gov/pub/data/ace/swepam/level_2_cdaweb/swe_h2/$Y AccessFilenameTemplate ac_h2_swe_$Y$m$d_$v.cdf Acknowledgement D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. See the Rules Of Use available from the ACE Science Center at: http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. 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/AC_H2_SWE/clientLibraryExample/ Style WebService ProductKey AC_H2_SWE Description Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS. Format Binary Acknowledgement D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. See the Rules Of Use available from the ACE Science Center at: http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. Please acknowledge the Data Providers and CDAWeb when using these Data. AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF 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 AC_H2_SWE Description Web Service to this product using the HAPI interface. Format CSV Acknowledgement D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. See the Rules Of Use available from the ACE Science Center at: http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. Please acknowledge the Data Providers and CDAWeb when using these Data. ProviderProcessingLevel Calculated InstrumentIDs spase://SMWG/Instrument/ACE/Ephemeris spase://SMWG/Instrument/ACE/SWEPAM MeasurementType Ephemeris MeasurementType ThermalPlasma TemporalDescription TimeSpan StartDate 1998-02-04 00:00:00.000 RelativeStopDate -P3M Note The Data become available about three Months after Observation Cadence PT1H ObservedRegion Heliosphere ObservedRegion Heliosphere.Inner ObservedRegion Heliosphere.NearEarth Parameter #1 Name Epoch Time ParameterKey Epoch Description Epoch Time, Beginning of Interval Caveats Average Type: standard This Parameter exhibits an increasing Monotonic Progression. Cadence PT1H Units ms UnitsConversion 1.0e-3>s RenderingHints AxisLabel Epoch ValueFormat E14.8 ScaleMin 6.2987652219904e+13 ScaleMax 6.3745034619904e+13 ScaleType LinearScale ValidMin 01-Jan-1996 00:00:00.000 ValidMax 01-Jan-2020 00:00:00.000 FillValue -1.0e+31 Support SupportQuantity Temporal Parameter #2 Name Time PB5 Set Time Series defined by using: EPOCH ParameterKey Time_PB5 Description Time PB5, Time of Observation, Year, Day, and Milliseconds of Day Caveats This Parameter exhibits an increasing Monotonic Progression. Cadence PT1H RenderingHints ScaleType LinearScale Structure Size 3 Element Name Year Index 1 Units a ValidMin 1997 ValidMax 2020 RenderingHints AxisLabel year ScaleMin 1997 ScaleMax 2020 Element Name Day of Year (Jan 1 = Day 1) Index 2 Units d ValidMin 1 ValidMax 366 RenderingHints AxisLabel day ScaleMin 1 ScaleMax 366 Element Name Elapsed milliseconds of day Index 3 Units ms ValidMin 0 ValidMax 86400 RenderingHints AxisLabel msec ScaleMin 0 ScaleMax 86400 FillValue -2147483648 Support SupportQuantity Temporal Parameter #3 Name Solar Wind Proton Number Density Set Time Series defined by using: EPOCH ParameterKey Np Description Solar Wind Proton Number Density Caveats Np is the Solar Wind Proton Number Density in Units of cm^-3, as calculated by Integration of the Ion Distribution Function. Cadence PT1H Units cm^-3 UnitsConversion 1.0e6>m^-3 RenderingHints DisplayType TimeSeries AxisLabel H_Density ValueFormat F8.4 ScaleMin 0.0 ScaleMax 100.0 ValidMin 0.0 ValidMax 200.0 FillValue -1.0e+31 Particle ParticleType Proton Qualifier Magnitude Qualifier Moment ParticleQuantity NumberDensity AtomicNumber 1 Parameter #4 Name Solar Wind Proton Bulk Speed Set Time Series defined by using: EPOCH ParameterKey Vp Description Solar Wind Proton Bulk Speed Caveats Vp is the Solar Wind Proton Speed, or more generally just the Solar Wind Bulk Speed. It is obtained by Integration of the Ion (Proton) Distribution Function. Cadence PT1H Units km/s UnitsConversion 1.0e3>m/s RenderingHints DisplayType TimeSeries AxisLabel SW_H_Speed ValueFormat F8.2 ScaleMin 0.0 ScaleMax 500.0 ValidMin 0.0 ValidMax 2000.0 FillValue -1.0e+31 Particle ParticleType Proton Qualifier Moment Qualifier Scalar ParticleQuantity FlowSpeed AtomicNumber 1 Parameter #5 Name Solar Wind Proton Temperature, Radial Set Time Series defined by using: EPOCH ParameterKey Tpr Description Solar Wind Proton Temperature, Radial Component Caveats The Radial Component of the Proton Temperature is the (1,1) Component of the Temperature Tensor, along the Radial Direction. It is obtained by Integration of the Ion (Proton) Distribution Function. Cadence PT1H Units °K RenderingHints DisplayType TimeSeries AxisLabel H_Temp_radial ValueFormat F9.1 ScaleMin 1000.0 ScaleMax 1.1e+06 ValidMin 1000.0 ValidMax 1.1e+06 FillValue -1.0e+31 Particle ParticleType Proton Qualifier Component.I ParticleQuantity Temperature AtomicNumber 1 Parameter #6 Name Solar Wind Alpha Particle to Proton Density Ratio Set Time Series defined by using: EPOCH ParameterKey alpha_ratio Description Solar Wind Alpha Particle to Proton, He++/H+, Density Ratio Caveats Alpha Ratio (Na/Np) is the Ratio of the Number Density of Helium++ Ions to the Number Density of Protons Cadence PT1H RenderingHints DisplayType TimeSeries AxisLabel Na/Np ValueFormat F8.4 ScaleMin 0.0 ScaleMax 0.5 ValidMin 0.0 ValidMax 10.0 FillValue -1.0e+31 Particle ParticleType AlphaParticle ParticleType Proton Qualifier Ratio Qualifier Scalar ParticleQuantity NumberDensity AtomicNumber 1 AtomicNumber 2 Parameter #7 Name Solar Wind Bulk Velocity Vector, GSE, Cartesian Coordinates Set Time Series defined by using: EPOCH ParameterKey V_GSE Description Solar Wind Bulk Velocity Vector, Geocentric Solar Ecliptic, GSE, Cartesian Coordinates Cadence PT1H Units km/s UnitsConversion 1.0e3>m/s CoordinateSystem CoordinateRepresentation Cartesian CoordinateSystemName GSE RenderingHints DisplayType TimeSeries ValueFormat F8.1 Structure Size 3 Element Name VX (GSE) Index 1 ValidMin -1800.0 ValidMax 0.0 RenderingHints ScaleMin -1200.0 ScaleMax 0.0 Element Name VY (GSE) Index 2 ValidMin -900.0 ValidMax 900.0 RenderingHints ScaleMin -500.0 ScaleMax 500.0 Element Name VZ (GSE) Index 3 ValidMin -900.0 ValidMax 900.0 RenderingHints ScaleMin -500.0 ScaleMax 500.0 FillValue -1.0e+31 Particle ParticleType Ion Qualifier Vector Qualifier Moment ParticleQuantity FlowVelocity Parameter #8 Name Solar Wind Bulk Velocity Vector, RTN, Cartesian Coordinates Set Time Series defined by using: EPOCH ParameterKey V_RTN Description Solar Wind Bulk Velocity Vector, Radial Tangential Normal, RTN, Cartesian Coordinates Cadence PT1H Units km/s UnitsConversion 1.0e3>m/s CoordinateSystem CoordinateRepresentation Cartesian CoordinateSystemName RTN RenderingHints DisplayType TimeSeries ValueFormat F8.1 Structure Size 3 Element Name VR (RTN) Index 1 ValidMin 0.0 ValidMax 1800.0 RenderingHints ScaleMin 0.0 ScaleMax 1200.0 Element Name VT (RTN) Index 2 ValidMin -900.0 ValidMax 900.0 RenderingHints ScaleMin -500.0 ScaleMax 500.0 Element Name VN (RTN) Index 3 ValidMin -900.0 ValidMax 900.0 RenderingHints ScaleMin -500.0 ScaleMax 500.0 FillValue -1.0e+31 Particle ParticleType Ion Qualifier Vector Qualifier Moment ParticleQuantity FlowVelocity Parameter #9 Name Solar Wind Bulk Velocity Vector, GSM, Cartesian Coordinates Set Time Series defined by using: EPOCH ParameterKey V_GSM Description Solar Wind Bulk Velocity Vector, Geocentric Solar Magnetospheric, GSM, Cartesian Coordinates Cadence PT1H Units km/s UnitsConversion 1.0e3>m/s CoordinateSystem CoordinateRepresentation Cartesian CoordinateSystemName GSM RenderingHints DisplayType TimeSeries ValueFormat F8.1 Structure Size 3 Element Name VX (GSM) Index 1 ValidMin -1800.0 ValidMax 0.0 RenderingHints ScaleMin -1200.0 ScaleMax 0.0 Element Name VY (GSM) Index 2 ValidMin -900.0 ValidMax 900.0 RenderingHints ScaleMin -500.0 ScaleMax 500.0 Element Name VZ (GSM) Index 3 ValidMin -900.0 ValidMax 900.0 RenderingHints ScaleMin -500.0 ScaleMax 500.0 FillValue -1.0e+31 Particle ParticleType Ion Qualifier Vector Qualifier Moment ParticleQuantity FlowVelocity Parameter #10 Name Spacecraft Position Vector, GSE, Cartesian Coordinates Set Time Series defined by using: EPOCH ParameterKey SC_pos_GSE Description Spacecraft Position Vector, Geocentric Solar Ecliptic, GSE, Cartesian Coordinates Caveats Average Type: standard Cadence PT1H Units km UnitsConversion 1.0e3>m CoordinateSystem CoordinateRepresentation Cartesian CoordinateSystemName GSE RenderingHints DisplayType TimeSeries ValueFormat F9.1 Structure Size 3 Element Name ACE X-GSE Index 1 ValidMin -2.0e+06 ValidMax 2.0e+06 RenderingHints ScaleMin -2.0e+06 ScaleMax 2.0e+06 Element Name ACE Y-GSE Index 2 ValidMin -1.0e+06 ValidMax 1.0e+06 RenderingHints ScaleMin -1.0e+06 ScaleMax 1.0e+06 Element Name ACE Z-GSE Index 3 ValidMin -1.0e+06 ValidMax 1.0e+06 RenderingHints ScaleMin -1.0e+06 ScaleMax 1.0e+06 FillValue -1.0e+31 Support Qualifier Vector SupportQuantity Positional Parameter #11 Name Spacecraft Position Vector, GSM, Cartesian Coordinates Set Time Series defined by using: EPOCH ParameterKey SC_pos_GSM Description Spacecraft Position Vector, Geocentric Solar Magnetospheric, GSM, Cartesian Coordinates Caveats Average Type: standard Cadence PT1H Units km UnitsConversion 1.0e3>m CoordinateSystem CoordinateRepresentation Cartesian CoordinateSystemName GSM RenderingHints DisplayType TimeSeries ValueFormat F9.1 Structure Size 3 Element Name ACE X(GSM) Index 1 ValidMin -2.0e+06 ValidMax 2.0e+06 RenderingHints ScaleMin -2.0e+06 ScaleMax 2.0e+06 Element Name ACE Y(GSM) Index 2 ValidMin -1.0e+06 ValidMax 1.0e+06 RenderingHints ScaleMin -1.0e+06 ScaleMax 1.0e+06 Element Name ACE Z(GSM) Index 3 ValidMin -1.0e+06 ValidMax 1.0e+06 RenderingHints ScaleMin -1.0e+06 ScaleMax 1.0e+06 FillValue -1.0e+31 Support Qualifier Vector SupportQuantity Positional