2.7.2 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/MarsScienceLaboratory/RAD/Observation/Level2 NASA NumericalData Mars Science Laboratory (MSL), Radiation Assessment Detector (RAD), Level 2 Observation Dosimetry, LET, and Neutral-Particle Data MSL_RAD_OBS-L2 https://doi.org/10.48322/20qb-4e17 2026-10-03T19:00:04Z 2025-07-07T12:34:56.789Z Initial release of metadata, ADAPT generated, LFB 2026-09-16T12:34:56.789Z Curated and checked for SPASE 2.7.2 structural and semantic consistency, OK 2026-10-03T19:00:04Z Added DOI. tlk Mars Science Laboratory Radiation Assessment Detector (RAD) Level 2 observation data for Mars surface operations. The record contains quality-filtered variables, identified by the _f suffix, and corresponding all-quality variables for detector alive time, dose-rate products, linear energy transfer (LET) spectra, and neutral-radiation histograms, together with associated bin and axis support variables and the FLAGGED_DATA quality indicator. Dose products include total detector B dose rate, MMRTG-corrected detector B dose rate, detector E dose rate, and 16 sub-observation time-slice values. Neutral histograms represent neutron and gamma-ray events measured by detectors D and E. The RAD instrument is described in detail by Hassler et al. (2012). Please acknowledge the RAD Principal Investigator Dr. Donald M. Hassler, the MSL/RAD data providers, and NASA/GSFC SPDF/CDAWeb when using these data. Donald M. Hassler 2026-10-03T15:17:54.000Z Space Physics Data Facility spase://SMWG/Person/Donald.M.Hassler PrincipalInvestigator The Radiation Assessment Detector (RAD) Investigation https://link.springer.com/article/10.1007/s11214-012-9913-1 Instrument description in The Radiation Assessment Detector (RAD) Investigation by Hassler et al. (2012). en MSL RAD Reduced Data Record Software Interface Specification https://pds-ppi.igpp.ucla.edu/data/MSL-M-RAD-3-RDR-V1.0/DOCUMENT/RAD_RDR_SIS.PDF RAD reduced-data product structure, processing, histogram, and dosimetry definitions. en spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb 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/aaa_planetary/msl/rad/cdf/obs-l2/ MSL_RAD_OBS-L2 Access to Data in CDF Format via ftps from SPDF HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/aaa_planetary/msl/rad/cdf/obs-l2/ MSL_RAD_OBS-L2 Access to Data in CDF Format via https from SPDF CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=MSL_RAD_OBS-L2&index=sp_phys MSL_RAD_OBS-L2 Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb CDF None Please acknowledge the Principal Investigator D.M. Hassler, the MSL/RAD data providers, and NASA/GSFC SPDF/CDAWeb when using these data. Calibrated spase://SMWG/Instrument/MarsScienceLaboratory/RAD EnergeticParticles 2011-11-20T18:29:59.000Z P0D Mars Alive Time of detector electronics Time series defined by using: EPOCH ALIVE_TIME_f [Quality filtered] Actual instrument observation time s TimeSeries Alive Time F8.2 0.00 5000.00 -1.0e+31 Temporal Total Dose for B both total, and corrected for RTG background Time series defined by using: EPOCH DOSIMETRY_TOTAL_f [Quality filtered] Radiation dose rate on Mars (recorded in Si, corrected for MMRTG contribution, and tissue-equivalent plastic) µGy/day TimeSeries F10.3 3 Total Dose B 1 RTG Corrected Dose B 2 Total Dose E 3 0.000 100000.000 -1.0e+31 Other Array Total Dose for B and E in 1/16th time increments of an observation Time series defined by using: EPOCH DOSIMETRY_TIMESLICE_f [Quality filtered] Dose-rate array for detectors B and E at 16 sub-observation time slices; dimension 1 uses DOSIMETRY_TIMESLICE_AXIS and dimension 2 uses DOSIMETRY_DOSE_AXIS. µGy/day Spectrogram F10.3 16 3 -1.0e+31 Other Array Bin start time Time series defined by using: EPOCH DOSIMETRY_TIMESLICE_AXIS Start-time support axis for the 16 sub-observation dosimetry intervals. rclk 1/16th timestamp I10 LinearScale 16 0 9999 4294967295 Array Temporal Total Dose Time series defined by using: EPOCH DOSIMETRY_DOSE_AXIS Three-element support axis identifying total detector B dose rate, MMRTG-corrected detector B dose rate, and total detector E dose rate. µGy/day Dosimetry I4 3 0 255 255 Array Other LET spectrum in silicon Time series defined by using: EPOCH LET_A1A2_f [Quality filtered] LET spectrum on Mars in Si (geometric factor ~ 0.9 cm^2 sr) counts Spectrogram LET A1+A2 F10.2 LogScale 52 0.00 1000000.00 -1.0e+31 Proton AlphaParticle Ion Array Counts Bin Start Time series defined by using: EPOCH LET_BIN_ENERGY LET bin-start value for the 52-element silicon LET spectrum. keV/micron Energy F10.2 52 0.00 45000.00 -1.0e+31 Array Other Det. D + Det. E counts Time series defined by using: EPOCH HISTOGRAM_NEUTRAL_DE_f [Quality filtered] Neutral particle (neutrons + gamma rays) counts on Mars counts Spectrogram Neutral D+E F12.3 LogScale 96 0.000 10000000.000 -1.0e+31 Other Neutron Array Counts in Det. D Time series defined by using: EPOCH HISTOGRAM_NEUTRAL_D_f [Quality filtered] Neutral particle counts in CsI counts Spectrogram Neutral D F12.3 LogScale 96 0.000 10000000.000 -1.0e+31 Other Neutron Array Counts in Det. E Time series defined by using: EPOCH HISTOGRAM_NEUTRAL_E_f [Quality filtered] Neutral particle counts in tissue-equivalent plastic counts Spectrogram Neutral E F12.3 LogScale 96 0.000 10000000.000 -1.0e+31 Other Neutron Array Alive Time of detector electronics Time series defined by using: EPOCH ALIVE_TIME [All quality] Actual instrument observation time s TimeSeries Alive Time F8.2 0.00 5000.00 -1.0e+31 Temporal Total Dose for B both total, and corrected for RTG background Time series defined by using: EPOCH DOSIMETRY_TOTAL [All quality] Radiation dose rate on Mars (recorded in Si, corrected for MMRTG contribution, and tissue-equivalent plastic) µGy/h TimeSeries F10.3 3 Total Dose B 1 RTG Corrected Dose B 2 Total Dose E 3 0.000 100000.000 -1.0e+31 Other Array Total Dose for B and E in 1/16th time increments of an observation Time series defined by using: EPOCH DOSIMETRY_TIMESLICE [All quality] Dose-rate array for detectors B and E at 16 sub-observation time slices; dimension 1 uses DOSIMETRY_TIMESLICE_AXIS and dimension 2 uses DOSIMETRY_DOSE_AXIS. µGy/h Spectrogram F10.3 16 3 -1.0e+31 Other Array LET spectrum in silicon Time series defined by using: EPOCH LET_A1A2 [All quality] LET spectrum on Mars in Si (geometric factor ~ 0.9 cm^2 sr) counts Spectrogram LET A1+A2 F10.2 LogScale 52 0.00 1000000.00 -1.0e+31 Proton AlphaParticle Ion Array Counts Det. D + Det. E counts Time series defined by using: EPOCH HISTOGRAM_NEUTRAL_DE [All quality] Neutral particle (neutrons + gamma rays) counts on Mars counts Spectrogram Neutral D+E F12.3 LogScale 96 0.000 10000000.000 -1.0e+31 Other Neutron Array Counts in Det. D Time series defined by using: EPOCH HISTOGRAM_NEUTRAL_D [All quality] Neutral particle counts in CsI counts Spectrogram Neutral D F12.3 LogScale 96 0.000 10000000.000 -1.0e+31 Other Neutron Array Counts in Det. E Time series defined by using: EPOCH HISTOGRAM_NEUTRAL_E [All quality] Neutral particle counts in tissue-equivalent plastic counts Spectrogram Neutral E F12.3 LogScale 96 0.000 10000000.000 -1.0e+31 Other Neutron Array Bin Start Energy Time series defined by using: EPOCH HISTOGRAM_BIN_ENERGY_D Energy at the start of the bin for detector D MeV TimeSeries Energy F12.3 96 0.000 10000000.000 -1.0e+31 Array Other Bin Start Energy Time series defined by using: EPOCH HISTOGRAM_BIN_ENERGY_E Energy at the start of the bin for detector E MeV TimeSeries Energy F12.3 96 0.000 10000000.000 -1.0e+31 Array Other Flagged data should be removed for science Time series defined by using: EPOCH FLAGGED_DATA Data-quality indicator. Flagged values identify observations with quality issues from commanding, DAN activity, or other sources; the source metadata states that flagged data should be removed for science use. Flagged Data A16 DataQuality Epoch TT2000 EPOCH CDF TT2000 epoch time tag for each RAD observation. day-month-year hour:minute:second Epoch 2005-01-01T00:00:00.000000000 2035-01-01T00:00:00.000000000 9999-12-31T23:59:59.999999999 Temporal