3. Data Output for SPEX.

Now let's do more accurate spectral analysis using SPEX. First we'll make some files for SPEX to use. Let's go back to the SPECTRA window and click on the box next to "Use Semi-calibrated Data" so that the check disappears.

Now we can create and save two FITS file for SPEX to use. The first will contain a time series of spectra, one for each of the 20 time bins, with 97 energy bins in each spectrum. The second FITS file will contain the SRM of the instrument for the specific time of this flare. To do this, click on the button labeled "Write output file..." at the bottom of the SPECTRA window. The following window will appear:

 

 

The "Create SRM file" is checked by default but we need to decide if we want to use just the diagonal terms, an approximation of the off-diagonal elements, or " the "full calculation of off diagonal, diagonal elements" from the pull-down list of choices next to the word "Simplify." For now, to speed up the demonstration and since the flare we are analyzing is detectable only up to about 100 keV, we will leave it set at the default choice of "2- Diagonal terms only." Also, since the thin shutter was in place at this time, we will limit the analysis to >10 keV.

Now go ahead and click the "Write FITS file" button.

It will offer you the following file names (based on the start date and time) for the spectrum and srm files, respectively:

hsi_spectrum_20020220_110000.fits

hsi_srm_20020220_110000.fits

You may accept these and put them in your default IDL Working Directory or you can enter different paths and/or names to save them in a different directory. Be sure to use the same file names and locations when you enter SPEX. When the box that says "Working..." disappears, you may click on the "Close" button in the "Write Spectrum FITS or GENX file" window.

 

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