2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/ACE/SWEPAM/KeyParameter/PT5M NASA NumericalData ACE Solar Wind Electron, Proton, and Alpha Monitor (SWEPAM) Plasma Moments, Preliminary Values, Key Parameter (K0), 5 min Data https://doi.org/10.48322/pfr6-fg57 2025-12-04T13:28:25Z 2021-04-27T15:38:11 Last known prior metadata Release Date 2022-04-20T12:34:56.789 ACE: DOI and PublicationInfo added, metadata revised by J.M. Weygand on 2022-04-08, reviewed by LFB 2022-05-17T12:34:56.789 ACE: Updated to SPASE Version 2.4.0, three InformationURL URLs updated, revised by LFB on 2022-05-17 2025-09-30T14:27:19Z 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 2025-12-04T13:28:25Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB The ACE Browse Data are designed for monitoring large-scale Particle and Field Behavior and for selecting interesting Time Periods. The Data are automatically generated from the Spacecraft Data Stream using simple Algorithms provided by the Instrument Teams. It is not routinely checked for Accuracy and is subject to revision. Use this Data at your own Risk, and consult with the appropriate Instrument Teams about citing it. These are SWEPAM Browse Data. These Data have not validated by the Experimenters and should not be used except for preliminary Examination prior to detailed Studies. SWEPAM - Solar Wind Electron Proton Alpha Monitor References: https://izw1.caltech.edu/ACE/. D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. McComas, D., Skoug, R., Delapp, D., Elliott, H., and Davis, A. 2022-04-27T00:00:00 Space Physics Data Facility spase://SMWG/Person/David.J.McComas PrincipalInvestigator spase://SMWG/Person/Robert.E.McGuire MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact ACE Science Center Home Page for Level 2 Data Release Notes https://izw1.caltech.edu/ACE/ASC/level2/index.html ACE Level 2 Data Release Notes Home Page ACE Science Center Home Page for Level 2 Rules of Use https://izw1.caltech.edu/ACE/ASC/level2/policy_lvl2.html ACE Level 2 Rules of Use Home Page ACE SWEPAM Instrument Description https://doi.org/10.1023/A:1005040232597 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 spase://VSPO/NumericalData/ACE/SWEPAM/PT300S spase://VSPO/NumericalData/P_ACE_HDR_SWEPAM_300S spase://VSPO/NumericalData/ACE/SWEPAM/KeyParameter/PT5M spase://SMWG/Repository/NASA/GSFC/SPDF Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/ace/swepam/level_2_cdaweb/swe_k0/ Access to Data in CDF Format via ftp from SPDF HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/ace/swepam/level_2_cdaweb/swe_k0/ Access to Data in CDF Format via http from SPDF CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=AC_K0_SWE&index=sp_phys AC_K0_SWE Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb CDF None https://cdaweb.gsfc.nasa.gov/pub/data/ace/swepam/level_2_cdaweb/swe_k0/$Y ac_k0_swe_$Y$m$d_$v.cdf D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. Please acknowledge the Data Providers and CDAWeb when using these Data. spase://SMWG/Repository/NASA/GSFC/SPDF Online Open CDAWeb Programmatic Data Access https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/AC_K0_SWE/clientLibraryExample/ AC_K0_SWE Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS. Binary D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. Please acknowledge the Data Providers and CDAWeb when using these Data. spase://SMWG/Repository/NASA/GSFC/SPDF Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products CDAWeb HAPI Server https://cdaweb.gsfc.nasa.gov/hapi AC_K0_SWE Web Service to this product using the HAPI interface. CSV D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. Please acknowledge the Data Providers and CDAWeb when using these Data. Calculated spase://SMWG/Instrument/ACE/SWEPAM ThermalPlasma 2017-01-01T00:00:00.000 -P7D The Data become available about one Week after Observation PT5M Heliosphere Heliosphere.Inner Heliosphere.NearEarth Epoch Time Epoch Epoch Time, Centered Average Type: standard This Parameter exhibits an increasing Monotonic Progression. PT5M ms 1.0e-3>s Epoch E14.8 6.2987652219904e+13 6.3745034619904e+13 LinearScale 01-Jan-1996 00:00:00.000 01-Jan-2020 00:00:00.000 -1.0e+31 Temporal Time PB5 Time Series defined by using: EPOCH Time_PB5 Time PB5, Time of Observation, Year, Day, and Milliseconds of Day This Parameter exhibits an increasing Monotonic Progression. PT5M LinearScale 3 Year 1 a 1997 2020 year 1997 2020 Day of Year (Jan 1 = Day 1) 2 d 1 366 day 1 366 Elapsed milliseconds of day 3 ms 0 86400 msec 0 86400 -2147483648 Temporal Solar Wind Proton Number Density Time Series defined by using: EPOCH Np Solar Wind Proton Number Density Np is the Solar Wind Proton Number Density in Units of cm^-3, as calculated by Integration of the Ion Distribution Function. These Data are Preliminary Values and are for Browse use only. PT5M cm^-3 1.0e6>m^-3 TimeSeries SW H Num Density F6.2 0.0 200.0 0.0 1000.0 -1.0e+31 Proton Magnitude Moment NumberDensity 1 Solar Wind Proton Bulk Speed Time Series defined by using: EPOCH Vp Solar Wind Proton Bulk Speed 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. These Data are Preliminary Values and are for Browse use only. PT5M km/s 1.0e3>m/s TimeSeries SW Bulk Speed F8.1 0.0 500.0 0.0 1000.0 -1.0e+31 Proton Moment Scalar FlowSpeed 1 Solar Wind Alpha Particle to Proton Density Ratio, Percentage Time Series defined by using: EPOCH He_ratio Solar Wind Alpha Particle to Proton, He++/H+, Density Ratio, Percentage He_ratio is the Ratio of the Number Density of Helium++ Ions to the Number Density of Protons. These Data are Preliminary Values and are for Browse use only. PT5M TimeSeries He++/H+ F7.3 0.0 100.0 0.0 100.0 -1.0e+31 AlphaParticle Proton Ratio Scalar NumberDensity 1 2 Solar Wind Proton Temperature, Radial Time Series defined by using: EPOCH Tpr Solar Wind Proton Temperature, Radial 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. These Data are Preliminary Values and are for Browse use only. PT5M K TimeSeries H Temp (radical) F9.1 1000.0 100000.0 1000.0 1.0e+06 -1.0e+31 Proton Moment Scalar Temperature 1 Weight, Number of Measurements in Average Time Series defined by using: EPOCH Weight Weight, Number of Measurements in Average for 5 min Data PT5M Weight F4 0.0 10.0 LinearScale 0.0 10.0 -1.0e+31 Other