Name: Mars Science Laboratory (MSL), Radiation Assessment Detector (RAD), Level 2 Observation Dosimetry, LET, and Neutral-Particle Data
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const indicator = document.getElementById("usa-banner-indicator"); if (details.style.display === "none") { details.style.display = "block"; indicator.textContent = "^"; } else { details.style.display = "none"; indicator.textContent = "v"; } } const monthName=new Array("January","February","March","April","May","June","July","August","September","October","November","December"); let currentDate = new Date(); let currentIsoDateStr = currentDate.toISOString().substring(0, 10); let currentDateStr = currentDate.getFullYear() + '-' + monthName[currentDate.getMonth()] + '-' + currentDate.getDate(); Data Access FTPS from SPDF (not with most browsers) HTTPS from SPDF CDAWeb WebService: CDAWeb Programmatic Data Access Mars Science Laboratory (MSL), Radiation Assessment Detector (RAD), Level 2 Observation Dosimetry, LET, and Neutral-Particle Data ResourceID spase://NASA/NumericalData/MarsScienceLaboratory/RAD/Observation/Level2 Description 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). Metadata Rights CC0-1.0: Creative Commons Zero v1.0 Universal Note CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license. View XML | Edit Details Version:2.7.2 NumericalData ResourceID spase://NASA/NumericalData/MarsScienceLaboratory/RAD/Observation/Level2 NamingAuthority NASA ResourceType NumericalData ResourceHeader ResourceName Mars Science Laboratory (MSL), Radiation Assessment Detector (RAD), Level 2 Observation Dosimetry, LET, and Neutral-Particle Data AlternateName MSL_RAD_OBS-L2 ReleaseDate 2026-09-16 12:34:56.789Z RevisionHistory RevisionEvent ReleaseDate 2025-07-07 12:34:56.789Z Note Initial release of metadata, ADAPT generated, LFB RevisionEvent ReleaseDate 2026-09-16 12:34:56.789Z Note Curated and checked for SPASE 2.7.2 structural and semantic consistency, OK Description 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). Acknowledgement Please acknowledge the RAD Principal Investigator Dr. Donald M. Hassler, the MSL/RAD data providers, and NASA/GSFC SPDF/CDAWeb when using these data. Contacts Role Person StartDate StopDate Note 1. PrincipalInvestigator spase://SMWG/Person/Donald.M.Hassler InformationURL Name The Radiation Assessment Detector (RAD) Investigation URL https://link.springer.com/article/10.1007/s11214-012-9913-1 Description Instrument description in The Radiation Assessment Detector (RAD) Investigation by Hassler et al. (2012). Language en InformationURL Name MSL RAD Reduced Data Record Software Interface Specification URL https://pds-ppi.igpp.ucla.edu/data/MSL-M-RAD-3-RDR-V1.0/DOCUMENT/RAD_RDR_SIS.PDF Description RAD reduced-data product structure, processing, histogram, and dosimetry definitions. Language en AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Availability Online AccessRights Open RightsList Rights SchemeURI https://spdx.org/licenses/ RightsIdentifierScheme SPDX RightsIdentifier CC0-1.0 RightsURI https://spdx.org/licenses/CC0-1.0.html RightsName Creative Commons Zero v1.0 Universal Note CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products AccessURL Name FTPS from SPDF (not with most browsers) URL ftps://spdf.gsfc.nasa.gov/pub/data/aaa_planetary/msl/rad/cdf/obs-l2/ ProductKey MSL_RAD_OBS-L2 Description Access to Data in CDF Format via ftps from SPDF AccessURL Name HTTPS from SPDF URL https://spdf.gsfc.nasa.gov/pub/data/aaa_planetary/msl/rad/cdf/obs-l2/ ProductKey MSL_RAD_OBS-L2 Description Access to Data in CDF Format via https from SPDF AccessURL Name CDAWeb URL https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=MSL_RAD_OBS-L2&index=sp_phys ProductKey MSL_RAD_OBS-L2 Description Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb Format CDF Encoding None AccessDirectoryTemplate https://cdaweb.gsfc.nasa.gov/pub/data/aaa_planetary/msl/rad/cdf/obs-l2/$Y AccessFilenameTemplate msl_rad_obs-l2_$Y$j_$v.cdf Acknowledgement Please acknowledge the Principal Investigator D.M. Hassler, the MSL/RAD data providers, and NASA/GSFC SPDF/CDAWeb when using these data. AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF Availability Online AccessRights Open AccessURL Name CDAWeb Programmatic Data Access URL https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/MSL_RAD_OBS-L2/clientLibraryExample/ Style WebService ProductKey MSL_RAD_OBS-L2 Description Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS. Format Binary Acknowledgement Please acknowledge the Principal Investigator D.M. Hassler, the MSL/RAD data providers, and NASA/GSFC SPDF/CDAWeb when using these data. ProcessingLevel Calibrated InstrumentIDs spase://SMWG/Instrument/MarsScienceLaboratory/RAD MeasurementType EnergeticParticles TemporalDescription TimeSpan StartDate 2011-11-20 18:29:59.000Z RelativeStopDate P0D ObservedRegion Mars Parameter #1 Name Alive Time of detector electronics Set Time series defined by using: EPOCH ParameterKey ALIVE_TIME_f Description [Quality filtered] Actual instrument observation time Units s RenderingHints DisplayType TimeSeries AxisLabel Alive Time ValueFormat F8.2 ValidMin 0.00 ValidMax 5000.00 FillValue -1.0e+31 Support SupportQuantity Temporal Parameter #2 Name Total Dose for B both total, and corrected for RTG background Set Time series defined by using: EPOCH ParameterKey DOSIMETRY_TOTAL_f Description [Quality filtered] Radiation dose rate on Mars (recorded in Si, corrected for MMRTG contribution, and tissue-equivalent plastic) Units µGy/day RenderingHints DisplayType TimeSeries ValueFormat F10.3 Structure Size 3 Element Name Total Dose B Index 1 Element Name RTG Corrected Dose B Index 2 Element Name Total Dose E Index 3 ValidMin 0.000 ValidMax 100000.000 FillValue -1.0e+31 Mixed MixedQuantity Other Qualifier Array Parameter #3 Name Total Dose for B and E in 1/16th time increments of an observation Set Time series defined by using: EPOCH ParameterKey DOSIMETRY_TIMESLICE_f Description [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. Units µGy/day RenderingHints DisplayType Spectrogram ValueFormat F10.3 Structure Size 16 3 FillValue -1.0e+31 Mixed MixedQuantity Other Qualifier Array Parameter #4 Name Bin start time Set Time series defined by using: EPOCH ParameterKey DOSIMETRY_TIMESLICE_AXIS Description Start-time support axis for the 16 sub-observation dosimetry intervals. Units rclk RenderingHints AxisLabel 1/16th timestamp ValueFormat I10 ScaleType LinearScale Structure Size 16 ValidMin 0 ValidMax 9999 FillValue 4294967295 Support Qualifier Array SupportQuantity Temporal Parameter #5 Name Total Dose Set Time series defined by using: EPOCH ParameterKey DOSIMETRY_DOSE_AXIS Description Three-element support axis identifying total detector B dose rate, MMRTG-corrected detector B dose rate, and total detector E dose rate. Units µGy/day RenderingHints AxisLabel Dosimetry ValueFormat I4 Structure Size 3 ValidMin 0 ValidMax 255 FillValue 255 Support Qualifier Array SupportQuantity Other Parameter #6 Name LET spectrum in silicon Set Time series defined by using: EPOCH ParameterKey LET_A1A2_f Description [Quality filtered] LET spectrum on Mars in Si (geometric factor ~ 0.9 cm^2 sr) Units counts RenderingHints DisplayType Spectrogram AxisLabel LET A1+A2 ValueFormat F10.2 ScaleType LogScale Structure Size 52 ValidMin 0.00 ValidMax 1000000.00 FillValue -1.0e+31 Particle ParticleType Proton ParticleType AlphaParticle ParticleType Ion Qualifier Array ParticleQuantity Counts Parameter #7 Name Bin Start Set Time series defined by using: EPOCH ParameterKey LET_BIN_ENERGY Description LET bin-start value for the 52-element silicon LET spectrum. Units keV/micron RenderingHints AxisLabel Energy ValueFormat F10.2 Structure Size 52 ValidMin 0.00 ValidMax 45000.00 FillValue -1.0e+31 Support Qualifier Array SupportQuantity Other Parameter #8 Name Det. D + Det. E counts Set Time series defined by using: EPOCH ParameterKey HISTOGRAM_NEUTRAL_DE_f Description [Quality filtered] Neutral particle (neutrons + gamma rays) counts on Mars Units counts RenderingHints DisplayType Spectrogram AxisLabel Neutral D+E ValueFormat F12.3 ScaleType LogScale Structure Size 96 ValidMin 0.000 ValidMax 10000000.000 FillValue -1.0e+31 Mixed MixedQuantity Other ParticleType Neutron Qualifier Array Parameter #9 Name Counts in Det. D Set Time series defined by using: EPOCH ParameterKey HISTOGRAM_NEUTRAL_D_f Description [Quality filtered] Neutral particle counts in CsI Units counts RenderingHints DisplayType Spectrogram AxisLabel Neutral D ValueFormat F12.3 ScaleType LogScale Structure Size 96 ValidMin 0.000 ValidMax 10000000.000 FillValue -1.0e+31 Mixed MixedQuantity Other ParticleType Neutron Qualifier Array Parameter #10 Name Counts in Det. E Set Time series defined by using: EPOCH ParameterKey HISTOGRAM_NEUTRAL_E_f Description [Quality filtered] Neutral particle counts in tissue-equivalent plastic Units counts RenderingHints DisplayType Spectrogram AxisLabel Neutral E ValueFormat F12.3 ScaleType LogScale Structure Size 96 ValidMin 0.000 ValidMax 10000000.000 FillValue -1.0e+31 Mixed MixedQuantity Other ParticleType Neutron Qualifier Array Parameter #11 Name Alive Time of detector electronics Set Time series defined by using: EPOCH ParameterKey ALIVE_TIME Description [All quality] Actual instrument observation time Units s RenderingHints DisplayType TimeSeries AxisLabel Alive Time ValueFormat F8.2 ValidMin 0.00 ValidMax 5000.00 FillValue -1.0e+31 Support SupportQuantity Temporal Parameter #12 Name Total Dose for B both total, and corrected for RTG background Set Time series defined by using: EPOCH ParameterKey DOSIMETRY_TOTAL Description [All quality] Radiation dose rate on Mars (recorded in Si, corrected for MMRTG contribution, and tissue-equivalent plastic) Units µGy/h RenderingHints DisplayType TimeSeries ValueFormat F10.3 Structure Size 3 Element Name Total Dose B Index 1 Element Name RTG Corrected Dose B Index 2 Element Name Total Dose E Index 3 ValidMin 0.000 ValidMax 100000.000 FillValue -1.0e+31 Mixed MixedQuantity Other Qualifier Array Parameter #13 Name Total Dose for B and E in 1/16th time increments of an observation Set Time series defined by using: EPOCH ParameterKey DOSIMETRY_TIMESLICE Description [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. Units µGy/h RenderingHints DisplayType Spectrogram ValueFormat F10.3 Structure Size 16 3 FillValue -1.0e+31 Mixed MixedQuantity Other Qualifier Array Parameter #14 Name LET spectrum in silicon Set Time series defined by using: EPOCH ParameterKey LET_A1A2 Description [All quality] LET spectrum on Mars in Si (geometric factor ~ 0.9 cm^2 sr) Units counts RenderingHints DisplayType Spectrogram AxisLabel LET A1+A2 ValueFormat F10.2 ScaleType LogScale Structure Size 52 ValidMin 0.00 ValidMax 1000000.00 FillValue -1.0e+31 Particle ParticleType Proton ParticleType AlphaParticle ParticleType Ion Qualifier Array ParticleQuantity Counts Parameter #15 Name Det. D + Det. E counts Set Time series defined by using: EPOCH ParameterKey HISTOGRAM_NEUTRAL_DE Description [All quality] Neutral particle (neutrons + gamma rays) counts on Mars Units counts RenderingHints DisplayType Spectrogram AxisLabel Neutral D+E ValueFormat F12.3 ScaleType LogScale Structure Size 96 ValidMin 0.000 ValidMax 10000000.000 FillValue -1.0e+31 Mixed MixedQuantity Other ParticleType Neutron Qualifier Array Parameter #16 Name Counts in Det. D Set Time series defined by using: EPOCH ParameterKey HISTOGRAM_NEUTRAL_D Description [All quality] Neutral particle counts in CsI Units counts RenderingHints DisplayType Spectrogram AxisLabel Neutral D ValueFormat F12.3 ScaleType LogScale Structure Size 96 ValidMin 0.000 ValidMax 10000000.000 FillValue -1.0e+31 Mixed MixedQuantity Other ParticleType Neutron Qualifier Array Parameter #17 Name Counts in Det. E Set Time series defined by using: EPOCH ParameterKey HISTOGRAM_NEUTRAL_E Description [All quality] Neutral particle counts in tissue-equivalent plastic Units counts RenderingHints DisplayType Spectrogram AxisLabel Neutral E ValueFormat F12.3 ScaleType LogScale Structure Size 96 ValidMin 0.000 ValidMax 10000000.000 FillValue -1.0e+31 Mixed MixedQuantity Other ParticleType Neutron Qualifier Array Parameter #18 Name Bin Start Energy Set Time series defined by using: EPOCH ParameterKey HISTOGRAM_BIN_ENERGY_D Description Energy at the start of the bin for detector D Units MeV RenderingHints DisplayType TimeSeries AxisLabel Energy ValueFormat F12.3 Structure Size 96 ValidMin 0.000 ValidMax 10000000.000 FillValue -1.0e+31 Support Qualifier Array SupportQuantity Other Parameter #19 Name Bin Start Energy Set Time series defined by using: EPOCH ParameterKey HISTOGRAM_BIN_ENERGY_E Description Energy at the start of the bin for detector E Units MeV RenderingHints DisplayType TimeSeries AxisLabel Energy ValueFormat F12.3 Structure Size 96 ValidMin 0.000 ValidMax 10000000.000 FillValue -1.0e+31 Support Qualifier Array SupportQuantity Other Parameter #20 Name Flagged data should be removed for science Set Time series defined by using: EPOCH ParameterKey FLAGGED_DATA Description 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. RenderingHints AxisLabel Flagged Data ValueFormat A16 Support SupportQuantity DataQuality Parameter #21 Name Epoch TT2000 ParameterKey EPOCH Description CDF TT2000 epoch time tag for each RAD observation. Units day-month-year hour:minute:second RenderingHints AxisLabel Epoch ValidMin 2005-01-01T00:00:00.000000000 ValidMax 2035-01-01T00:00:00.000000000 FillValue 9999-12-31T23:59:59.999999999 Support SupportQuantity Temporal