does responsivity calibration:
respcal does the responsivity calibration by scaling the signals with
the Relative Spectral Response Function (RSRF):
- responsivity calibration is done per AOT band and detector
- the wavelength dependent responsivities for each AOT band are normalized
with respect to the key wavelength.
- the signals that belong to certain AOT bands are then divided by the
normalized responsivities for these AOT bands
- for SWS01 observations the responsivities are additionally smoothed by a
fluxconserving interpolation, using wavelength dependent factors, which
determine the range of wavelengths over which the smoothing has to be done.
These factors depend on AOT speed, AOT band and on wavelength.
Cal-files:
- cal13: relative flux
- cal19: grating FWHM Responsivity
- cal25_xx: spectral responsivity (for all bands: xx = 1A - 6)
Help text: IA auto analysis
Alternative: use IA routine
resp_inter as substitute for respcal
Comment:
The true RSRF depends on the position of the source in the entrance slit and
its extension. Therefore respcal can not remove the quickly varying,
periodical features in the response function esp. of band 2C and 3A to 3E
completely. Fringe pattern remain, which can be (partially) removed by using
the IA routines fringes or aarfringe.
The IA routine resp_inter
accounts for a shift of the RSRF due to slight mis-pointing and a scaling
for RSRFs determined with inadequately resolution (the RSRF functions used
currently have been determined at a resolution below the nominell instrument
resolution).
