Name: IMP 7 LANL 1-hr plasma data
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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 IMP 7 LANL 1-hr plasma data ResourceID spase://NASA/NumericalData/IMP7/LEPEDEA/PT60M Description This set of IMP 7 LANL 1-hour solar wind plasma parameter data includes temperature anisotropy and alpha/proton ratio. This hourly resolution data set was created at NSSDC in the year 2003 by averaging 2-min resolution solar wind data provided over the years by LANL. Magnetosheath data were excluded from the 2-min data by LANL. This data set supersedes hourly solar wind data provided by LANL over the years. 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/IMP7/LEPEDEA/PT60M NamingAuthority NASA ResourceType NumericalData ResourceHeader ResourceName IMP 7 LANL 1-hr plasma data ReleaseDate 2026-06-26 13:17:53Z RevisionHistory RevisionEvent ReleaseDate 2020-07-07 21:14:38Z Note Only known prior ReleaseDate of the metadata RevisionEvent ReleaseDate 2025-12-04 13:29:33Z Note Added MetadataRightsList and RightsList(s). Added ResourceType and NamingAuthority. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB RevisionEvent ReleaseDate 2026-06-26 13:17:53Z Note Add 'Z' to TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB Description This set of IMP 7 LANL 1-hour solar wind plasma parameter data includes temperature anisotropy and alpha/proton ratio. This hourly resolution data set was created at NSSDC in the year 2003 by averaging 2-min resolution solar wind data provided over the years by LANL. Magnetosheath data were excluded from the 2-min data by LANL. This data set supersedes hourly solar wind data provided by LANL over the years. Acknowledgement Please acknowledge NASA Space Physics Data Facility, National Space Science Data Center and the Principal Investigator for data usage. Contacts Role Person StartDate StopDate Note 1. GeneralContact spase://SMWG/Person/John.T.Gosling PriorIDs spase://VSPO/NumericalData/P_IMP7_HDR_LANL_1HR spase://VMO/NumericalData/IMP7/LANL/PT1H spase://VSPO/NumericalData/IMP7/LEPEDEA/PT60M 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/imp/imp7/plasma_lanl/solarwind_1hr/ AccessURL Name HTTPS from SPDF URL https://spdf.gsfc.nasa.gov/pub/data/imp/imp7/plasma_lanl/solarwind_1hr/ Description In CDF via HTTP from SPDF Format Text Acknowledgement National Aeronautics and Space Administration; National Space Science Data Center and Space Physics Data Facility, Dr John Gosling ProcessingLevel Calibrated ProviderResourceName Los Alamos National Laboratory IMP-7 Solar Plasma Electrostatic Analyzer data ProviderProcessingLevel Calibrated InstrumentIDs spase://SMWG/Instrument/IMP7/LEPEDEA spase://SMWG/Instrument/IMP7/GOSLING MeasurementType ThermalPlasma TemporalDescription TimeSpan StartDate 1972-10-06 00:00:00Z StopDate 1978-09-30 00:00:00Z Cadence PT60M ObservedRegion Heliosphere.NearEarth ObservedRegion Earth.Magnetosphere ObservedRegion Earth.NearSurface Parameter #1 Name Universal Time ParameterKey Column_1 Column_2 Column_3 Description The three universal time columns from left to right are: year, day of year, and hour of the day. Cadence PT1H Structure Size 3 Description Universal Time expressed in two columns yymmdd and hhmms. Element Name Year Index 1 ParameterKey Column_1 Units year Element Name day of year Index 2 ParameterKey Column_2 Units days Element Name Hour of the day Index 3 ParameterKey Column_3 Units hours Support SupportQuantity Temporal Parameter #2 Name Number of Points ParameterKey Column_4 Description Numer of points to determine average values. Not entirely clear if this is correct interpretation from the descripttion in IMP7_1hrave_00readme.txt. Cadence PT1H Support SupportQuantity Other Parameter #3 Name IMP7 Spacecraft Position Vector in Solar Ecliptic coordinates ParameterKey Column_5 Column_6 Column_7 Description Location of the spacecraft in solar ecliptic coordinates in units of kilometers and degrees. The coordinate system is not clear. Assumed thhat the coordinate system is solar ecliptic based on the 2 min averages. Cadence PT1H CoordinateSystem CoordinateRepresentation Spherical CoordinateSystemName SE Structure Size 3 Element Name Radius Qualifier Component.I Index 1 ParameterKey column_5 Units km Element Name SELat Qualifier Component.J Index 2 ParameterKey column_6 Units degrees Element Name SELong Qualifier Component.K Index 3 ParameterKey column_7 Units degrees Support SupportQuantity Positional Parameter #4 Name IMP7 Density ParameterKey Column_8 Description IMP7 density values in units of #/cm^3. Cadence PT1H Units #/cm^3 Particle ParticleType Proton Qualifier Magnitude ParticleQuantity NumberDensity Parameter #5 Name IMP7 Flow Speed ParameterKey Column_9 Description IMP7 speed values in units of km/s. Cadence PT1H Units km/s Particle ParticleType Proton Qualifier Magnitude ParticleQuantity FlowSpeed Parameter #6 Name IMP7 Flow Azimuth ParameterKey Column_10 Description IMP7 flow azimuth direction in units of degrees. The units are not entirely clear. Assumed thhat the units are degrees based on the 2 min averages. Cadence PT1H Units degrees Particle ParticleType Proton Qualifier Magnitude ParticleQuantity ArrivalDirection Parameter #7 Name Maximum Temperature ParameterKey Column_11 Description Maximum proton temprature in units of Kelvin. Cadence PT1H Units K Particle ParticleType Proton Qualifier Maximum ParticleQuantity Temperature Parameter #8 Name Minimum Temperature ParameterKey Column_12 Description Minimum proton temprature in units of Kelvin. Cadence PT1H Units K Particle ParticleType Proton Qualifier Minimum ParticleQuantity Temperature Parameter #9 Name Proton Temperature ParameterKey Column_13 Description Proton temprature in units of degrees. Cadence PT1H Units K Particle ParticleType Proton Qualifier Average ParticleQuantity Temperature Parameter #10 Name Pressure Tensor ParameterKey Column_14 Description Pressure tensor symmetry axis in units of degrees. This description is based on the IMP7 2 min averaged data. Cadence PT1H Units degrees Particle ParticleType Proton Qualifier DirectionAngle ParticleQuantity Pressure Parameter #11 Name Alpha Proton Ratio ParameterKey Column_15 Description Ratio of alphas to protons. Cadence PT1H Particle ParticleType AlphaParticle ParticleType Proton Qualifier Ratio ParticleQuantity NumberDensity Parameter #12 Name Relative Alpha Proton flow speed ParameterKey Column_16 Description Relative flow speed of alphas to protons in units of km/s. Cadence PT1H Units km/s Particle ParticleType AlphaParticle ParticleType Proton Qualifier Magnitude ParticleQuantity FlowSpeed Parameter #13 Name Relative Alpha to Proton Angle ParameterKey Column_17 Description Relative Flow Angle of alphas to protons in units of degrees. Cadence PT1H Units degrees Particle ParticleType AlphaParticle ParticleType Proton Qualifier Magnitude ParticleQuantity ArrivalDirection Parameter #14 Name Alpha proton temperature ratio ParameterKey Column_18 Description Ratio of the temperature of the alphas to the temperature of the protons. Cadence PT1H Particle ParticleType AlphaParticle ParticleType Proton Qualifier Ratio ParticleQuantity Temperature Parameter #15 Name Standard Deviation in the Spacecraft Position Vector in Solar Ecliptic coordinates ParameterKey Column_19 Column_20 Column_21 Description Standard deviation of the location of the spacecraft in solar ecliptic coordinates in units of kilometers and degrees. The coordinate system is not clear. Assumed thhat the coordinate system is solar ecliptic based on the 2 min average data files. Cadence PT1H CoordinateSystem CoordinateRepresentation Spherical CoordinateSystemName SE Structure Size 3 Element Name Standard deviation of theRadius Qualifier Component.I Index 1 ParameterKey column_19 Units km Element Name Standard deviation of the SELat Qualifier Component.J Index 2 ParameterKey column_20 Units degrees Element Name Standard deviation of the SELong Qualifier Component.K Index 3 ParameterKey column_21 Units degrees Support Qualifier StandardDeviation SupportQuantity Positional Parameter #16 Name Standard Deviation in the Density ParameterKey Column_22 Description Standard deviation in the density values in units of #/cm^3. Cadence PT1H Units #/cm^3 Particle ParticleType Proton Qualifier StandardDeviation ParticleQuantity NumberDensity Parameter #17 Name Standard Deviation in the Flow Speed ParameterKey Column_23 Description Standard deviation in the speed values in units of km/s. Cadence PT1H Units km/s Particle ParticleType Proton Qualifier StandardDeviation ParticleQuantity FlowSpeed Parameter #18 Name Standard Deviation in the Flow Azimuth ParameterKey Column_24 Description Standard deviation in the flow azimuth direction in units of degrees. The units are not entirely clear. Assumed thhat the units are degrees based on the 2 min averages. Cadence PT1H Units degrees Particle ParticleType Proton Qualifier StandardDeviation ParticleQuantity ArrivalDirection Parameter #19 Name Standard Deviation in the Maximum Temperature ParameterKey Column_25 Description Standard deviation in the maximum proton temprature in units of Kelvin. Cadence PT1H Units K Particle ParticleType Proton Qualifier StandardDeviation ParticleQuantity Temperature Parameter #20 Name Standard Deviation in the Minimum Temperature ParameterKey Column_26 Description Standard deviation in the minimum proton temprature in units of Kelvin. Cadence PT1H Units K Particle ParticleType Proton Qualifier StandardDeviation ParticleQuantity Temperature Parameter #21 Name Standard Deviation in the Proton Temperature ParameterKey Column_27 Description Standard deviation in the proton temprature in units of degrees. Cadence PT1H Units K Particle ParticleType Proton Qualifier StandardDeviation ParticleQuantity Temperature Parameter #22 Name Standard Deviation in the Pressure Tensor ParameterKey Column_28 Description Pressure tensor symmetry axis in units of degrees. This description is based on the IMP7 2 min averaged data. Cadence PT1H Units degrees Particle ParticleType Proton Qualifier StandardDeviation ParticleQuantity Pressure Parameter #23 Name Standard Deviation in the Alpha Proton Ratio ParameterKey Column_29 Description Standard deviation in the ratio of alphas to protons. Cadence PT1H Particle ParticleType AlphaParticle ParticleType Proton Qualifier StandardDeviation ParticleQuantity Fluence Parameter #24 Name Standard Deviation in the Relative Alpha Proton Flow Speed ParameterKey Column_30 Description Standard deviation in the relative flow speed of alphas to protons in units of km/s. Cadence PT1H Units km/s Particle ParticleType AlphaParticle ParticleType Proton Qualifier StandardDeviation ParticleQuantity FlowSpeed Parameter #25 Name Standard Deviation in the Relative Alpha to Proton Angle ParameterKey Column_31 Description Standard deviation in the relative flow angle of alphas to protons in units of degrees. Cadence PT1H Units degrees Particle ParticleType AlphaParticle ParticleType Proton Qualifier StandardDeviation ParticleQuantity ArrivalDirection Parameter #26 Name Standard Deviation in the Alpha Proton Temperature Ratio ParameterKey Column_32 Description Standard deviation in the ratio of the temperature of the alphas to the temperature of the protons. Cadence PT1H Particle ParticleType AlphaParticle ParticleType Proton Qualifier StandardDeviation ParticleQuantity Temperature