![]() LEVEL specifies the data processing level (0 for raw data, 1 for science data). WAVELNTH = 174 / bandpass peak responseĬREATOR contains the version of the software which produced the current FITS file. ORIGIN = ‘ROB-SIDC’ / Royal Observatory of BelgiumĭETECTOR = ’CMOS 1Kx1K’ / HAS CMOS detector 1024x1024 pixels LEVEL = 0 / data processing level: 0=raw, 1=scienceĬREATOR = ‘SWEDG’ / FITS creation software DATE refers to the time of FITS file creation and will often differ from DATE-OBS due to telemetry delays, level of processing … ![]() The FITS file name is specified by FILENAME, which has the format “swap_lv0_YYYYMMDD_HHMMSS.fts”, with the date/time info as in DATE-OBS below.ĭATE = ’T03:21:42.44’ / UTC time of FITS file creationĭATE-OBS = ’T00:02:17.398’ / UTC time of observationĭATE-OBS denotes both the date and time corresponding to the start of the image exposure. If EXTEND = F, there are no extensions.įILENAME = ‘swap_lv0_20100501_000217.fits’ / FITS filenameįILE_TMR = ’swap_00254518859444_117ffb14.fits’ / SWTMR filenameįILE_RAW = ’BINSWAP201005010002310000054889PROCESSED’ / raw telemetry filenameįILE_TAR= ’BINSWAP_1132_SVA1_2010.05.01T02.29.20.tar’ / raw telemetry packageįILE_RAW reveals the name of the raw binary file from which the FITS file has been created. a cosmic-ray pixel map (when it exists)) are included in the FITS file. ![]() If EXTEND = T, then one or more extensions (e.g. All SWAP images will have two axes and most images will be 1024x1024 pixels. The next 3 keywords indicate the number of axes and number of pixels along each of those axes. BITPIX states the number of bits per pixel and can take values 8, 16, 32, …, so although SWAP data will be 11 or 12 bits/pixel, BITPIX must be set to 16 (could be -32 in case of level 1 data which are still in float format). SIMPLE is a logical (either F or T) keyword specifying whether the file conforms to basic FITS standards SWAP data will always be SIMPLE = T. SIMPLE = T / SWAP data will always be SIMPLE FITS formatīITPIX = 16 / Number of bits per data pixel (’-’ means float values)ĮXTEND = F / F = no extensions T = extension(s) Therefore, it is the reference science product and does not require the user to use any proprietary software. In other words, this type of FITS file contains an image that is corrected for all known instrumental defects, with the image data in exposure-normalized units (DN/s/pixel). There are two levels of SWAP FITS files: Level Zero (LV0) and level 1 (LV1).Ī SWAP LV0 FITS file contains all information that is required to analyze any particular image (contains image data in digital numbers (DN)), but at the same time to restrict this information to that subset which is stable over time and will not require reprocessing when a new understanding of the instrument performance becomes available.Ī SWAP LV1 FITS file is to be a handy, easy-to-use format for the scientific user, thereby shielding the user from the instrumental peculiarities which are not relevant for solar physics research. All lines in the header contain a keyword and its value, and a short comment concerning the keyword definition. SWAP data are stored in FITS files, each with a keyword header containing all the information about the image.
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