Absolute spectra for 26 August 2002 flare

Channel's No 3 spectra are the result of subtraction of ~95% of the fluorescence contribution from the total signal (concerns observations taken in 2002). Therefore we recommend NOT using this channel's (No 3) spectra for quantitative analysis. The work on fluorescence calibration is in progress and the data will (hopefully) be better corrected later on.

  • 26 August 2002 flare (max ~ 16:24 UT)



    • Download:

       Fits data file (1.8 MB)
       Program for reading RESIK fits files (3.2 kB)


      Reading RESIK fits files

      resik_read_fits, fname_fits, dset, index, data

      where:
      1) fname_fits - fits file name (input)
      2) dset - data set to read. (input)
           (To read entire fits file content set dset to -1 -> resik_read_fits, fname_fits, -1, index, data)
      3) index - RESIK index structure (output see description below)
      4) data - RESIK data cube (output see description below)

      Description of RESIK index tags and data cube

      1) index - the RESIK index structure contains the following tags:

         INSTRUMENT STRING INSTRUMENT NAME
         OBSERVATION_TYPE     STRING       TYPE OF OBSERVATION
         SPECTRA_UNITS     STRING       UNITS OF RESIK ABSOLUTE SPECTRA
         WVL_UNITS     STRING        WAVELENGTHS UNITS
         SPC_N      LONG        NUMBER OF SPECTRA IN THE FILE
         BIN_N      INT        NUMBER OF BINS per RESIK CHANNEL
         CHAN_N      INT        NUMBER RESIK CHANNELS
         SPEC_ID      LONG        SPECTRUM NUMBER (starting from 0)
         STIME_ST      STRING        SPECTRUM START TIME
         STIME_CE      STRING        SPECTRUM CENTRAL TIME
         STIME_EN      STRING         SPECTRUM END TIME
         TIME_ST      DOUBLE        SPECTRUM START TIME - JULIAN TIME
         TIME_CE      DOUBLE        SPECTRUM CENTRAL TIME - JULIAN TIME
         TIME_EN      DOUBLE        SPECTRUM END TIME - JULIAN TIME
         EXPDUR      FLOAT        SPECTRUM EXPOSURE DURATION IN SECONDS

      2) data - the RESIK data cube is a (256, 16, n) array where n is the number of spectra read by resik_read_fits.

      data(*, 0:3, *)     -      wavelengths of particular RESIK channels
      data(*, 4:7, *)     -      absolute RESIK spectra
      data(*, 8:11, *)     -     uncertaintees of RESIK spectra
      data(*, 12:15, *)     -      Level-0 data, RESIK spectra corrected for orbital background

      Using RESIK data within IDL environment (examples)

       Plotting single spectrum in selected channel with uncertainties

      1) plot resik spectrum for channel 1

      plot, data[*, 0, 0], data[*, 4, 0], yst=10, xra=[3.3, 3.9],xst=1
      errplot, data[*, 0, 0], data[*, 4, 0]*(1-data[*, 8, 0]), data[*, 4, 0]*(1+data[*, 8, 0])

      2) Plotting spectrum selected channel integrated over all spectra with uncertainties

      a) summing the array
       zz=total(reform(data[*, 4, *]),2)

      b) processing uncertainties (summation of assumed Gaussian dispersions)
       uu=sqrt(total(reform(data[*, 8, *]^2),2))/n_elements(index)

       plot,data[*, 0, *],zz,psym=10,xra=[3.3, 3.9],xst=1,yst=1
       errplot,data[*, 0, 0],zz*(1-uu),zz*(1+uu)