InSight HP3/RAD Release Notes Users are encouraged to provide comments to the PDS Geosciences Node if errors are found either in data or in documentation in this archive. Please send comments by e-mail or U.S. mail to: PDS Geosciences Node Washington University Dept. of Earth and Planetary Sciences 1 Brookings Drive St. Louis, MO 63130 U.S.A. Web: http://pds-geosciences.wustl.edu Email: geosci@wunder.wustl.edu This document, release_notes.txt, contains release notes and errata concerning the InSight HP3 and RAD archives. It is updated with each release of HP3 and RAD data. Section A of this document contains an entry for each HP3/RAD release with general information about the contents of the release, in order from newest to oldest. Updates to previously released files are reported in these entries, along with any known errata. Section B of this file contains general notes, if any, concerning the archive as a whole. ******** SECTION A ******** ------------------------------------------------------------ Release Number: 7 Release Date: 2021-01-04 Data Coverage: 2020-07-01 through 2020-10-12 (Sols 567-668) New products have been added to these collections: urn:nasa:pds:insight_rad:data_calibrated urn:nasa:pds:insight_rad:data_derived urn:nasa:pds:insight_rad:data_raw Comments: With this data release the RAD archive now includes almost one year of surface data, starting on sol 14. Due to insufficient availability of energy during this season with high dust opacity, the activities of this instrument were very limited. Only one diurnal curve was measured on sol 602/603. Otherwise activities were restricted to occasional measurements of the approximate minimum and maximum temperatures shortly before 6 and 13 hours of local solar time, respectively. Self calibration requires more energy and it was decided to use the scarce energy for science measurements instead, since changes to the calibration, e.g. from deposition of dust on the filter windows, can likely be interpolated for this period using future self-calibration measurements with only a small loss of accuracy. This however means that the data in this release might have to be modified in the future, if the self-calibration measurements indicate that a drift of calibration coefficients has occurred. Release Number: 6 Release Date: 2020-10-01 Data Coverage: 2020-04-01 through 2020-06-30 (Sols 478-567) New products have been added to these collections: urn:nasa:pds:insight_rad:data_calibrated urn:nasa:pds:insight_rad:data_derived urn:nasa:pds:insight_rad:data_raw Comments: The self-calibration data acquired during this release period do not show clear evidence of an ongoing sensor drift and the previous coefficients continue to be used for data calibration. The data of this release period includes observations during Phobos eclipses on sols 495, 498 and 501. FOV1, observing near the lander is increasingly affected by the passage of the solar panel shadow in the afternoon and early morning. Release Number: 5 Release Date: 2020-07-01 Data Coverage: 2020-01-01 through 2020-03-31 (Sols 390-478) New products have been added to these collections: urn:nasa:pds:insight_rad:data_calibrated urn:nasa:pds:insight_rad:data_derived urn:nasa:pds:insight_rad:data_raw Comments: The data in this release do not show evidence of an ongoing drift of sensor 2C, and they are calibrated using a constant sensitivity. The resolution of calibration measurements is not sufficient to exclude the possibility that a slow drift is still ongoing, which might be revealed by calibration measurements later. In this case the data of this release will likely be calibrated again, using a time varying sensitivity representing the drift. Release Number: 4 Release Date: 2020-04-01 Data Coverage: 2019-10-01 through 2019-12-31 (Sols 300-390) New products have been added to these collections: urn:nasa:pds:insight_rad:data_calibrated urn:nasa:pds:insight_rad:data_derived urn:nasa:pds:insight_rad:data_raw Comments: On of the radiometer sensors (2C, field of view 2 broadband sensor) experienced a significant drift of its calibration. On about sol 325 the brightness temperatures derived from this sensor started to progressively diverge from expected seasonal trends and the trends observed by the other sensors. The normal self-calibrations are run once per four weeks while new commands are uplinked once per week. The next performed self-calibration on sol 340 confirmed an increase in sensitivity. Following, more frequently scheduled calibrations showed that the drift continued to increase sensitivity and reached an apparently stable state at some point after sol 355. The exact timeline of the drift is however not well resolved by the self-calibrations and we assume that the sensitivity exponentially decays to the new state with a half life of 18 sols, starting on sol 325. It is possibly that better understanding of the root cause of this drift would lead us to modifying this timeline. This would result in an update of the calibrated and derived datasets in this release, however any changes will likely stay within the range of uncertainty provided in this release. ------------------------------------------------------------ Release Number: 3 Release Date: 2020-01-01 Data Coverage: 2019-07-01 through 2019-09-30 (Sols 210-299) New products have been added to these collections: urn:nasa:pds:insight_rad:data_calibrated urn:nasa:pds:insight_rad:data_derived urn:nasa:pds:insight_rad:data_raw Comments: Due to the conjunction the radiometer was off after sol 263. A typographical error in the release number 2 comments data coverage has been corrected. The table in the release notes for release 1A provided operation mode codes that are inconsistent with those in the raw data files. The raw data files provide the operation mode codes as they are used by the flight software, which are: Ops mode # | Description -----------|-------------------------------------------------------------- 0 | no operation mode, controlled by ground commands 65-66 | standard mode - not used due to technical issues 33-34 | hourly mode 97-98 | single mode 129-130 | calibration mode - only usable for science under certain conditions |(Temperature calibration target = temperature sensorhead) ------------------------------------------------------------ Release Number: 2 Release Date: 2019-09-26 Data Coverage: 2019-04-01 through 2019-06-30 (Sols 122-210) New products have been added to these collections: urn:nasa:pds:insight_rad:data_calibrated urn:nasa:pds:insight_rad:data_derived urn:nasa:pds:insight_rad:data_raw Comments: On about Sol 150 a jump in measured voltages about +4 microvolt has been observed in all channels of ADC-1 in the RAD Sensorhead. This offset has been corrected in all calibrated and derived data from sol 150 on, but not in the raw data. ------------------------------------------------------------ Release Number: 1, part 2 Release Date: 2019-06-26 Data Coverage: 2018-11-26 through 2019-03-31 (Sols 1-122) New products have been added to these collections: urn:nasa:pds:insight_rad:data_calibrated urn:nasa:pds:insight_rad:data_derived Products have been revised in these collections: urn:nasa:pds:insight_rad:data_raw Comments: The raw data table has been updated to extend through 2019-03-31 as well. For the calibrated and derived data products only those data vectors are used that can be calibrated. That means only data with operation modes 0-98 (see table below) and acquired while the instrument is within 0.1 K of its target temperature setpoint are used. Also, all data before 2018-12-11T07:30:42.598Z have been excluded because the dust cover was still closed. During ground calibration it was discovered that calibration uncertainties are larger than expected. The calibration coefficient also had to be updated using data gathered after landing on Mars, before the opening of the dust cover/calibration target. This results in large systematic errors in the sensors using narrow spectral bandpasses, i.e. sensors 1A, 1C, 2A, 2B. The derived data products are based on the calibrated data of sensors 1B and 2C. Assumed is a surface emissivity of 0.98 with an uncertainty of 0.02. (Morgan et al., A Pre-Landing Assessment of Regolith Properties at the InSight Landing Site. Space Sci Rev (2018) 214:104. doi:10.1007/s11214-018-0537-y.) The documentation (SIS) currently (2018-03-06) does not provide which of the three spectral filters is used in each of the six thermopile sensors. The spectral bandpasses are described in section 2.6.3.5 of the HP3 PDS SIS are given for each sensor in the following table: Sensor | Spectral Filter --------+------------------------ 1A | 8-10µm Bandpass 1B | 8-14µm Bandpass 1C | 16-19µm Bandpass 2A | 16-19µm Bandpass 2B | 8-10µm Bandpass 2C | 8-14µm Bandpass Raw data tables include a number indicating what operation mode was used. The modes are the following: Ops mode # | Description -----------|-------------------------------------------------------------- 0 | no operation mode, controlled by ground commands 65-66 | standard mode - not used due to technical issues 33-34 | hourly mode 97-98 | single mode 129-130 | calibration mode - only usable for science under certain conditions |(Temperature calibration target = Temperature Sensorhead) ------------------------------------------------------------ Release Number: 1, part 1 Release Date: 2019-04-22 Data Coverage: 2018-11-26 through 2019-02-28 (Sols 1-92) New products have been added to these collections: urn:nasa:pds:insight_rad:data_raw Products have been revised in these collections: none Comments: The first release of InSight data by PDS takes place in two parts. In Part 1 only raw data products are released. In Part 2, one month later, the calibrated versions of those products are released. Subsequent InSight releases are scheduled for every three months and will include both raw and calibrated products. ******** SECTION B ******** The self-calibration results are applied to the data by modifying one or more of the three calibration coefficients described in the RAD calibration paper (doi:10.1029/2020EA001086). The initial calibration coefficients are provided for each sensor and each instrument operating temperature T_SH in table 2 of that paper. These coeffiecients are an offset voltage C ([C] = µV), sensitivity to instrument heaters H ([H] = µV/W), and sensitivity to radiative heat flux of the observed surface S ([S] = µV/W). The updated coefficient is denoted by a prime and valid after the mission sol provided in the first column of the following table. Table B 1: Changes to published calibration coefficients sol | Coefficient change --------+--------------------------------------------------------------------- 154 | All ADC1 channels, specifically thermopile 1A, 1B, 1C: | C' = C - 4µV --------+--------------------------------------------------------------------- 326 | Sensitivity of thermopile 2C: | S' = S * ( x - (x-1) * exp( -(sol - 325)/18)) | x = [ 1.0173243 , 1.0617046 , 1.1231704] | for T_SH = [238.7 K, 268.7 K, 298.7 K] respectively --------+--------------------------------------------------------------------- Previous versions of the SIS documentation did not provide which of the three spectral filters is used in each of the six thermopile sensors. The spectral bandpasses are described in section 2.6.3.5 of the HP3 PDS SIS are given for each sensor in the following table: Table B 2: Identification of spectral bandpasses for the different sensors Sensor | Spectral Filter --------+------------------------ 1A | 8-10µm Bandpass 1B | 8-14µm Bandpass 1C | 16-19µm Bandpass 2A | 16-19µm Bandpass 2B | 8-10µm Bandpass 2C | 8-14µm Bandpass The SIS further does not clarify what the RAD operation mode codes provided in the raw data files mean. This information is provided in the following table. Table B 3: Identification codes of RAD software operation modes provided in the RAD raw data tables Ops mode # | Description -----------|-------------------------------------------------------------- 0 | no operation mode, controlled by ground commands 65-66 | standard mode - not used due to technical issues 33-34 | hourly mode 97-98 | single mode 129-130 | calibration mode - only usable for science under certain conditions |(Temperature calibration target = Temperature Sensorhead)