Page 1 18-APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover RHESSI LEVEL 0 DATA AND QUICKLOOK DATA PRODUCTS J MCTIERNAN UCB/SSL

Page 2 18-APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover LINKS: (All in need of updates) This Document: Level 0 Data Handling: Quicklook Data Products: Flare List: File database: Quicklook info and data structures:

Page 3 18-APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover

Page 4 18-APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover Data Products LEVEL 0 DATA FILES: usually 1 per orbit, telemetry packets with appended catalog; FITS binary extensions. “hsi_yyyymmdd_hhmmss_nnn.fits “. Max. Size=100Mbytes. “Orbits” start and end in SC night. Plot files (PNG format), images, spectra, and count rate plots. Daily Catalog files, online: “hessi_catalog_yyyymmdd.fits”, hsi_instrument_log_yyyymmdd.fits, available with SSW. Flare List,: “hessi_flare_list.fits”, also an ascii file: “hessi_flare_list.txt” Database file, contains file names, time ranges: “hsi_filedb.fits”

Page 5 18-APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover Data Issues and Gaps: 1.8 Gbytes per day of data (128 Gbytes total as of 15-Apr-2002) Approximately 2/3 of files need reprocessing due to : Ground Station - SOC (Science Ops Center) connection (rare) SOC Unix scripts (rare) IDL bugs and ‘features’ (common, but easier to fix) Files for HEDC flares have been reprocessed and qlook data has been appended, should work as planned.

Page 6 18-APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover HSI_FILEDB Each file is recorded as an entry in the filedb structure. This is written into a FITS file, which is opened and read and rewritten for every ground station contact. The database file for all level 0 data is distributed as part of the software. Contents: version = A version number file_id = file name orbit_start, orbit_end = Orbit number (GDS) at start and end of the file start_time, end_time = data start and end times status_flag = set to -1 if the file has been discarded, and the packets are contained in another file, set to 0 if the file is active npackets = Number of packets clock_drift_start, clock_drift_end = the value of the clock drift at file start and end

Page 7 18-APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover For Each Level 0 File: Observing Summary Hsi_obs_summ_rate: Spin-averaged count rates in 9 energy bands, summed over detectors, 4 second (~one spin period) time resolution. (Excludes detectors 2, 7, 8) hsi_mod_variance: Modulation variance, Front Segments 8 and 9. Hsi_ephemeris: S/C position and velocity, 20 sec (~5 spin periods) resolution. Hsi_qlook_roll_period, hsi_qlook_pointing: 10 arcsec resolution S/C pointing estimate and Roll period estimate, 20sec time resolution. (Not yet Implemented) hsi_obs_summ_flag: Data Flags, including: ['SAA_FLAG', 'ECLIPSE_FLAG', 'FLARE ‘, ’NON_SOLAR_EVENT', 'FRONT_RATIO', 'DECIMATION WEIGHT', ‘DECIMATION ENERGY’, 'SSR_STATE', 'ATTENUATOR_STATE’]

Page 8 18-APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover

Page 9 18-APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover Instrument Log : Hsi_qlook_monitor_rate: Quicklook Monitor Rates, 20 sec cadence hsi_qlook_rate_per_det: Count Rates per detector, summed over all energies, 20 sec hsi_qlook_packet_rate: Packet Rate, all app_ids, 5 minutes To be included: SOH data, temperatures, On-board memory usage, etc…

Page APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover Finding Flares: Use 1 min running average in 12 to 25 keV range to determine threshold count rate. Intervals with count rates from 12 to 25 keV greater than the threshold are flagged. Threshold is 3 sigma. (All thresholds are expected to be changed after we see real data). All the files for a given orbit are used in the flare_list routines Verify Solar events by checking: 1) Modulation variance must be greater than 3 sigma above background level. (modvar=10*(variance per spin)/(counts per spin)). 2) Front-Rear count ratio must be greater than 3 sigma above background level (front_ratio=front_counts( 300keV))). For events determined to be solar, the above criteria are used to adjust the flare end time.

Page APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover Flare Position: Flare position is found using a back-projection image for the peak 4 second interval of the flare. (Not Currently Implemented) 64 X 64 pixels - 35 arcsec resolution.

Page APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover Flare List Hsi_flare_list: Id number. Start, peak and end times, in energy range [12.0, 25.0] keV Peak count rate, counts/sec/segment and total counts, corrected for attenuator state Background Count rate and Time Range. Highest energy of observed photons. Flare position, arcsec from Sun center. Flags for flares that start/end in Eclipse or SAA, flares at file SOF, EOF. Non-solar event flag. Detector Id's (Fronts only are used for flares, both can be used for others). File(s) which have the data.

Page APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover Quicklook Spectra and Images Hsi_qlook_spectrum: “Semi-Calibrated” (I.e., diagonal response matrix) photon spectrum at flare peak, 392 energy channels, dE = 1 to 100 keV, larger at higher energies, with 1 keV channels near 511 and 2200 keV. (Not Implemented) hsi_qlook_image: Images at flare peak, 5 arcsecond spatial resolution, CLEAN algorithm, in the energy bands given by the Observing Summary, [3, 6, 12, 25, 50,100,300,1000,10000, 20000] keV (Not Implemented)

Page APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover Data Access: Command Line Interface: Define object: IDL> o=hsi_obs_summary(class_name=‘hsi_obs_summ_rate’) OR IDL> o = obj_new(‘hsi_obs_summ_rate’) IDL> data=o->getdata(obs_time_interval=‘20-feb-2002 ‘+[‘09:00’, ‘11:00’]) Use of obs_time_interval reads data from the data in HSI_DATA_ARCHIVE, with filenames found from the file ‘hsi_filedb.fits’ in $SSW/hessi/dbase. Other control parameters: filename, time_range, all are for use on files independent of the archive Other Methods (from Kim): plot, list IDL> o -> plot, /saa, /flare, /eclipse

Page APR-2002 RHESSI Data Analysis Workshop RHESSI Reuven Ramaty High Energy Solar Spectroscopic Imager Use or disclosure of data contained on this page is subject to the restrictions on the volume cover HSI_QLOOK_SUMMARY_PAGE Summarizes data for each orbit: o=hsi_qlook_summary_page(obs_time_int = [whatever]) o->list