Design, performance and calibration documentation
Description of the product
The SREM data files contain calibrated data for the different energy and particle species channels available in the SREM. Each data file contains 24 hours of data - from midnight to midnight (note this is not an OD) - with the date covered by the file easily identifiable through the file name.
SREM calibrated data was produced from the SREM raw data acquired during the entire mission.
Data for the SREM on board Herschel can be retrieved from the Herschel Science Archive.
SREM data from previous missions can be retrieved from the SREM archive at the Paul Scherrer Institut (PSI).
- Naming convention
- The files containing the SREM calibrated data will have a name of the form SREMPlanck_PACC_YYYYMMDD.fits where PACC stands for Processed ACCumulated data and YYYYMMDD is the date the data in the file was acquired.
- Each file contains three binary table extensions named CDFFITS1,CDFFITS2 and CDFFITS3. The first extension contains the accumulated counts data, the second extension the labels to identify the data in the first extension and the third extension the total radiation dosis. The contents of each extension are as follows.
|EPOCH||vector containing 1 string with UTC for accumulation period in ISO format (YYYY-MM-DDTHH:MM:SS.MMMZ)||A24||NA|
|COUNTRATE||vector containing 1 element for each channel (15 elements in total) with counts for accumulation period identified in the EPOCH column||E15.4|
|ORBIT||position of the SREM in the XXX frame||E15.4|
|PROT FITQUAL||this is a another keyword||I1|
|ODPF||this is a another keyword||E15.4|
|ODPFERR||this is a another keyword||E15.4|
|ELEC FITQUAL||this is a another keyword||I1|
|ODEF||this is a another keyword||E15.4|
|ODEFERR||this is a another keyword||E15.4|
|ANISOTROPY||this is a another keyword||E15.4|
|TEMPERATURE||2 element vector containing temperature of the two detector heads at each EPOCH||E15.4|
|EPOCH||this is a keyword|
|RADEPOCH||this is a keyword||A24|
|RADFET||this is a another keyword||E15.4|
- N. Of Files
- 1500 (TBC)
Note: SREM calibrated data files where initially provided in the Common Data Format (cdf) format. This has traditionally been the preferred data format for SREM on board previous ESA missions. However, as cdf is not widely used in the astrophysics community it was later agreed with the provider that fits files should also be provided. This meant taking the original cdf format and converting it to fits. The original cdf files can be retrieved from the SREM site at the PSI.
For data provided in the form of fits files a table containing a description of all the header keywords should be included here. The table should follow this format
|Keyword1||this is a keyword|
|Keyword2||this is a another keyword|
Space Radiation Environment Monitor
Operation Day definition is geometric visibility driven as it runs from the start of a DTCP (satellite Acquisition Of Signal) to the start of the next DTCP. Given the different ground stations and spacecraft will takes which station for how long, the OD duration varies but it is basically once a day.
Universal Time Coordinate(d)
To be confirmed
European Space Agency