FOS Data Handbook

calfos uses three different types of input files:

Input data files: these are the observation data files, in Generic Edited Information Set (GEIS) format, i.e., a multi-group image.

Reference files (GEIS format images).

Reference tables (STSDAS tables).

31.2.1 Science Files Required by calfos

Table 31.2 lists the science files that are used as required input to calfos.

Observation Input Files for calfos

File Extension File Contents
.shh and .shd

Standard header packet

.ulh and .uld

Unique data log

.d0h and .d0d

Science data

.q0h and .q0d

Science data quality

.x0h and .x0d

Science header line

.xqh and .xqd

Science header line data quality

.d1h and .d1d

Science trailer line

.q1h and .q1d

Science trailer line data quality

File Extension	File Contents
.`shh` and .`shd`	Standard header packet
.`ulh` and .`uld`	Unique data log
.`d0h` and .`d0d`	Science data
.`q0h` and .`q0d`	Science data quality
.`x0h` and .`x0d`	Science header line
.`xqh` and .`xqd`	Science header line data quality
.`d1h` and .`d1d`	Science trailer line
.`q1h` and .`q1d`	Science trailer line data quality

31.2.2 Reference Files and Tables

Table 31.1b lists the types of calibration reference files that are used in the pipeline and the information these files contain. Although reference files can be generated for any combination of NXSTEPS, FCHNL (first channel), NCHNLS, and OVERSCAN, the routine calibration reference files have a length of 2064 pixels, corresponding to the standard keyword values:

NXSTEPS = 4

FCHNL = 0

NCHNLS = 512

OVERSCAN = 5

For other values of FCHNL, NCHNLS, and NXSTEPS calfos interpolates from or resamples the standard reference files. Only OVERSCAN = 5 is supported by FOS calibration. Highly accurate OVERSCAN=1 reference files can not be simply extracted from the standard reference files as different values of OVERSCAN produced contributions from different numbers of physical diodes to the observed pixels. All FOS calibration observations were made with OVERSCAN=5.

**Reference Tables and Files Required by calfos**
Header Keyword	Data Base Relation	Filename Extension	File Contents
CCS0	cyccs0r	.cy0	Aperture areas
CCS1	cyccs1r	.cy1	Aperture positions
CCS2	cyccs2r	.cy2	Sky emission line positions
CCS3	cyccs3r	.cy3	Sky and background filter widths
CCS4	cyccs4r	.cy4	Polarimetry parameters
CCS5	cyccs5r	.cy5	Sky shift parameters
CCS6	cyccs6r	.cy6	Wavelength dispersion coefficients
CCS7	cyccs7r	.cy7	GIM correction scale factors
CCS8	cyccs8r	.cy8	Predicted background (count rate)
CCS9	cyccs9r	.cy9	Un-illuminated diodes for scattered light correction
CCSA	cyccsar	.cya	OTA focus positions for aperture throughputs
CCSB	cyccsbr	.cyb	Aperture throughput coefficients
CCSC	cyccscr	.cyc	Throughput corrections versus focus
CCSD	cyccsdr	.cyd	Instrument sensitivity throughput correction factors
CCG2	coccg2r	.cmg	Paired-pulse coefficients
BACHFILE	cybacr	.`r0h` & .`r0d`	Default background file (count rate)
FLnHFILE	cyfltr	.`r1h` & .`r1d`	Flatfield file
IVnHFILE	cyivsr	.`r2h` & .`r2d`	Inverse sensitivity file (ergs cm^-2 Å^-1 count^-1 diode^-1 )¹
RETHFILE	cyretr	.`r3h` & .`r3d`	Retardation file for polarimetry data
DDTHFILE	cyddtr	.`r4h` & .`r4d`	Disabled diode file
DQnHFILE	cyqinr	.`r5h` & .`r5d`	Data quality initialization file
AISHFILE	cyaisr	.`r8h` & .`r8d`	Average inverse sensitivity file

¹ Note that all references to inverse sensitivity, IVS, in the version 6 FOS Instrument Handbook contain the per diode component of this definition implicitly. The meaning of IVS is identical in both this document and in the FOS Instrument Handbook.

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Last updated: 01/14/98 14:47:13

31.2 Input Files

31.2.1 Science Files Required by calfos

31.2.2 Reference Files and Tables