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/EPAM/CA60/PHA/Ion/SEP_Event/MatrixData/PT17M NASA NumericalData ACE Electron Proton Alpha Monitor (EPAM) CA60 PHA Ion SEP Event Matrix Data, 17 min Averages EPAM-PHA-EVENT https://doi.org/10.48322/6mqq-dp50 2026-07-21T12:03:34Z 2020-07-07T21:14:06Z Last prior known metadata Release Date 2022-04-27T00:00:00Z ACE: DOI and PublicationInfo added, DataProducer PersonID updated, metadata revised by J.M. Weygand, reviewed by LFB 2022-05-17 2022-05-17T12:34:56.789Z ACE: Updated to SPASE Version 2.4.0, revised by LFB on 2022-05-17 2025-09-30T14:27:04Z 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 2025-12-04T13:28:11Z Added MetadataRightsList. Updated to 2.7.1. ZCB 2026-06-26T13:13:40Z Add 'Z' to RevisionEvent:ReleaseDate(s), PublicationDate, TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB 2026-06-26T15:23:11Z Updated PersonID for Dennis Haggerty to include middle initial (K). JWL 2026-07-21T12:03:34Z Added HelioData InformationURL. JWL Pulse Height Analyzer matrix data for a single Solar Energetic Particle event from the ACE:EPAM instrument. Using the PHA data, one can quickly and very accurately determine composition. Thomas P. Armstrong, Fundamental Technologies LLC Gold, R.E., Roelof, E.C., Krimigis, S., Haggerty, D., Armstrong, T., Manweiler, J.W., and Patterson, J.D. 2022-04-27T00:00:00Z Space Physics Data Facility spase://SMWG/Person/Dennis.K.Haggerty DataProducer Explanation of EPAM print-groups and CSV file nomenclature. http://data.ftecs.com/VHO/VEPO/ace_epam/explanation-csv-files.html The Explanation HTML page at Fundamental Technologies describes how the numeric data from the ACE EPAM instrument are divided into different print-groups, the nomenclature of the ASCII-based comma-separated variable (CSV) files, and how those files can be accessed. HelioData https://helio.data.nasa.gov/dataset/ACE_EPAM_CA60_PHA_Ion_SEP_Event_MatrixData_PT17M The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more. spase://NASA/NumericalData/ACE/EPAM/CA60/PHA/Sectored/Ion/SEP_Event/CountRates/PT17M Other spase://VEPO/NumericalData/ACE/EPAM/PHA/G120 spase://VSPO/NumericalData/ACE/EPAM/CA60/PHA/Ion/SEP_Event/MatrixData/PT17M spase://SMWG/Repository/FTECS Online Open ACE EPAM PHA Event Data http://data.ftecs.com/VHO/VEPO/ace_epam/pha/events/ Parent directory containing the PHA event data for the ACE/EPAM instrument for the entire mission. Text ASCII Thomas P. Armstrong, Fundamental Technologies LLC spase://SMWG/Instrument/ACE/EPAM EnergeticParticles 1990-01-01T00:00:00.000Z 2007-12-31T23:59:59.000Z PT17M Heliosphere.NearEarth Time for the record TimeStamp Time for the record given in year, day of year, hour, min, and decimal seconds. The given time represents the beginning of the event interval. 5 Year 1 -9999 Day of year 2 1 366 -999 Hour of day 3 0 23 -99 Minute of hour 4 0 59 -99 Seconds of minute 5 0.00 59.99 -99.99 Temporal Number of Events NEVENTS Number of C/D pairs contained in this event file. 0 1024 null Other Event time offset ETIME Time offset for a given C/D pair in hundredths of a second 0 204800 null Temporal Sector SECT Sector, 1-8, in which the C/D event pair occurs. 1 8 null Other C1 Digitized Height C1 Digitized pulse height from the first sampling of the C detector. 0 255 null Ion Energy D1 Digitized Height D1 Digitized pulse height from the first sampling of the D detector. 0 255 null Ion Energy C2 Digitized Height C2 Digitized pulse height from the second sampling of the C detector. 0 255 null Ion Energy D2 Digitized Height D2 Digitized pulse height from the second sampling of the D detector. 0 255 null Ion Energy C1 Energy C1-Eng Deposited energy from the first sampling of the C detector. keV 0.0 1.00E+06 null Ion Energy D1 Energy D1-Eng Deposited energy from the first sampling of the D detector. keV 0.0 1.00E+06 null Ion Energy C2 Energy C2-Eng Deposited energy from the second sampling of the C detector. keV 0.0 1.00E+06 null Ion Energy D2 Energy D2-Eng Deposited energy from the second sampling of the D detector. keV 0.0 1.00E+06 null Ion Energy Priority Schedule PSCHED Schedule for species priority: 0 - Fe, O, He, H 1 - O, Fe, H, He 2 - H, Fe, O, He 3 - He, Fe, O, H 0 3 null Other Event 1 Channel E1-Ch Channel which triggered the first event pair, W1-W8. Other Event 2 Channel E2-Ch Channel which triggered the second event pair, W1-W8. Other