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/L3/PT128S NASA NumericalData ACE Solar Wind Electron Proton Alpha Monitor (SWEPAM) Suprathermal Electron Pitch Angle 128-Second Level 3 Data https://doi.org/10.48322/3fs6-7328 2026-06-26T13:14:21Z 2020-07-07T21:14:15Z Last known prior metadata Release Date 2022-04-20T12:34:56.789Z ACE: DOI and PublicationInfo added, metadata revised by J.M. Weygand on 2022-04-08, reviewed by LFB 2022-05-17T12:34:56.789Z ACE: Updated to SPASE Version 2.4.0, two 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. Updated to 2.7.1. ZCB 2026-06-26T13:14:21Z Add 'Z' to RevisionEvent:ReleaseDate(s), PublicationDate. ZCB Suprathermal Electron Pitch Angle data from ACE/SWEPAM. Level 3 data, 128-second averages. These pitch angle distributions are calculated automatically by a computer code, and have not been validated by a person. It is therefore likely that they include some artifacts and erroneous values. These data files contain suprathermal electron pitch angle distribution functions (s^3 cm^-6) at 272 eV from the ACE/SWEPAM-E instrument. The energy channel is ~12% wide, centered at 272 eV. Pitch angle bins are 9 degrees wide, and run from 0 to 180 degrees (so 0-9, 9-18, 18-27 degrees, etc.). The break between the core and suprathermal electrons is generally around 70 eV at 1 AU, but varies around this value, at times exceeding 100 eV. Electrons at 272 eV are generally well within the suprathermal range, and the distribution at this energy typically shows very little contribution from the core population. The measured count rates at 272 eV energy provide excellent statistical significance. In addition, because of the high count rates, very few artifacts (for example due to sunlight contamination) are seen in the data at this energy. The data are in the solar wind frame, and have been corrected for the spacecraft potential. The spacecraft potential determination requires measurement of the lower energy electrons, and so the potentials calcuated at these times have been interpolated to the times of the suprathermal electron measurements. Transformation to the solar wind frame requires interpolation of the measurements (each at a different energy in the solar wind frame) to the desired energy (272 eV). Also note that the detector gains on the SWEPAM-E instrument change over time, including both slowly decreasing gains and abrupt increases when the instrument voltages are increased. The use of these data for long-term studies of the distribution function amplitudes is therefore strongly discouraged. Please acknowledge the ACE/SWEPAM instrument team and the ACE Science Center McComas, D., Skoug, R., Delapp, D., Elliott, H., and Davis, A. 2022-04-27T00:00:00Z Space Physics Data Facility spase://SMWG/Person/Andrew.J.Davis TechnicalContact ACE SWEPAM Level 3 Suprathermal Electron Pitch Angle Home Page https://izw1.caltech.edu/ACE/ASC/DATA/level3/swepam/index.html ACE Science Center site hosting description of the data set spase://VHO/NumericalData/ACE/SWEPAM/L3_PT128S spase://VSPO/NumericalData/ACE/SWEPAM/L3/PT128S spase://SMWG/Repository/ACE_SC Online Open ACE Science Center Data Set Page https://izw1.caltech.edu/ACE/ASC/DATA/level3/swepam/data/ HTTP file listing of the ACE SWEPAM Suprathermal Electron Pitch Angle files available at ACE Science Center Text.ASCII ZIP Please acknowledge the ACE/SWEPAM instrument team and the ACE Science Center ACE SWEPAM Suprathermal Electron Pitch Angle Level 3 Data Level 3 spase://SMWG/Instrument/ACE/SWEPAM ThermalPlasma 1997-12-16T00:00:00Z -P12M PT128S Heliosphere.NearEarth Year Column_1 Year of the data point Temporal DOY Column_2 Day of year Temporal Hour Column_3 Hour of the data point Temporal Minute Column_4 Minute of the data point Temporal Second Column_5 Second of the data point Temporal SCT Column_6 Spacecraft Time Temporal Suprathermal electron pitch angle distribution functions Column_7 thru Column_27 Suprathermal electron pitch angle distribution functions at 272 eV from the ACE/SWEPAM-E instrument. The energy channel is ~12% wide, centered at 272 eV. Pitch angle bins are 9 degrees wide, and run from 0 to 180 degrees (so 0-9, 9-18, 18-27 degrees, etc.). s^3 cm^-6 20 Electron PhaseSpaceDensity