2.7.1 https://spdx.org/licenses/ SPDX 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/PADRE/MeDDEA/Level0/Photon/FITS NASA NumericalData PADRE MeDDEA Level0 Photon FITS PADRE/MeDDEA Level0 Photon FITS MeDDEA Level0 Photon FITS https://doi.org/10.48322/szm6-x118 2026-08-04T14:51:19Z 2026-06-01T00:08:46Z Only known prior ReleaseDate of the metadata 2026-06-26T13:25:34Z Add 'Z' to PublicationDate. Added ResourceType and NamingAuthority. Added MetadataRightsList. ZCB 2026-07-20T00:08:46Z Added Parameter descriptions for the SCI and PKT FITS extensions. SY. 2026-07-21T12:06:13Z Added HelioData InformationURL. JWL 2026-07-28T15:31:01Z Add 'Z' to RevisionEvent:ReleaseDate(s). ZCB 2026-08-04T14:51:19Z Matched version number in schemaLocation attribute to updated value in Version tag. Added DOI. tlk PADRE MeDDEA Level0 Photon FITS data are uncalibrated hard X-ray event data obtained by the Measuring Directivity to Determine Electron Anisotropy (MeDDEA) instrument on the Solar Polarization and Directivity X-Ray Experiment (PADRE) CubeSat observatory. The Level0 photon files contain the same photon event data as the raw MeDDEA binary data, but converted to FITS format for more convenient analysis. Each raw photon data file generates a single Level0 photon FITS file. The photon product is an on-demand X-ray photon list that is generally available during large flares and calibration periods. Level0 photon files contain event data from detector triggers, including packet-level timing information and science event information such as detector identifier, channel, clock value, and uncalibrated event pulse height in ADC counts. These data support investigations of the directivity of solar flare hard X-ray emission and the angular distribution of flare-accelerated electrons. The PADRE MeDDEA Team: NASA Goddard Space Flight Center (USA); Space Sciences Laboratory, University of California Berkeley (USA); Southwest Research Institute (USA); University of Applied Sciences and Arts Northwestern Switzerland (Switzerland); CEA-Saclay (France) 2025-11-24T00:00:00Z NASA Goddard Space Flight Center, Solar Data Analysis Center (SDAC) spase://SMWG/Person/Steven.Christe PrincipalInvestigator PADRE MeDDEA Data Documentation https://padre-meddea.readthedocs.io/en/latest/user-guide/data.html Documentation describing MeDDEA data products, data levels, file naming conventions, and reading software. PADRE MeDDEA Level 0 Data Documentation https://padre-meddea.readthedocs.io/en/latest/user-guide/level0.html Documentation describing the organization of PADRE MeDDEA Level 0 FITS files, including photon, spectrum, and housekeeping files. HelioData https://helio.data.nasa.gov/dataset/PADRE_MeDDEA_Level0_Photon_FITS The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more. spase://SMWG/Repository/SDAC Online Open https://spdx.org/licenses/ SPDX 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. NASA/GSFC/SDAC PADRE MeDDEA Level 0 Photon FITS https://umbra.nascom.nasa.gov/padre/padre-meddea/l0/photon/ Directory listing for PADRE MeDDEA Level 0 photon FITS data at NASA/GSFC/SDAC. FITS Uncalibrated spase://SMWG/Instrument/PADRE/MeDDEA Spectrum 2025-06-23T00:00:00Z -P1M HardXRays Sun Sun.Chromosphere Sun.Corona Photon Event Data, FITS Extension 1 SCI FITS extension 1, named SCI, is a binary table containing one row for each detected photon event. Each row provides the packet sequence number, event clock, ASIC, electronic channel, uncalibrated pulse height in ADC counts, baseline, packet time, packet subsecond clock, and detector pixel identifier. Photon Intensity Photon Packet Data, FITS Extension 2 PKT FITS extension 2, named PKT, is a binary table containing one row for each telemetry packet. The table contains packet timing and acquisition information, instrument status and data-quality values, and packet-level event summary quantities. Its columns are seqcount, pkttimes, pktclock, pktlength, livetime, inttime, flags, decim_lvl, drop_cnt, int_time_flag, num_hits, rate, and corr_rate. Other