SWS Data File Descriptions

Last update: 22-Apr-96 The SWS pipeline data are distributed by ESA as binary FITS tables.

SWS Compact Status: ssta*

SWS Edited Raw Data (ERD): swer*

On 24 Hz basis: 24 blocks of 52 det. readouts; 13 housekeeping parameters
For each second of data the following is stored:
- 52 detector gains; 48 housekeeping parameters
- status word containing flags:
  which aperture?; internal CAL on/off?; reset pulse on/off?; etc.

Example: plot the 12th sample of the 200th second for detector 10 via:
idl>plot,erd.data(200).e24(12).det(10)

Standard Processed Data (SPD): swsp*

Header
Detector independent data (for each 1 second interval):

itk: instrument time key
raster: raster point ID
status: status word (bitcode)
grpos: grating position
grang: grating angle [deg]
fpcur: currends [dn]
fppos: FP position
fpgap: FP gap
det: replicate({spd_det},52); detector-dependent data

Detector dependent data (table with 5 columns):

det.wave: wavelength [micron]
det.flux: flux density [uV/sec]
det.offset: offset [uV/sec]
det.stdev: standard deviation in flux [uV/sec]
det.flag: flag [bitcode]

Example: Plot the flux versus wavelength for detector 10, second 200 via:
idl>plot,spd.data(200).det(10).wave,spd.data(200).det(10).flux

SWS Auto Analysis Results (AAR): swaa*

Field	Number	Format	Unit	Description
SWAAWAVE	1	R*4	micron	Wavelength of data point
SWAAFLUX	1	R*4	Jy	Flux density of data point
SWAASTDV	1	R*4	Jy	Standard Deviation
SWAATINT	1	I*4	sec	Total integration time
SWAADETN	1	I*4		Detector number
SWAAITK	1	I*4		SWS instrument time key
SWAAUTK	1	I*4		ISO uniform time key
SWAARPID	2	I*1		Raster point ID
SWAASPAR	2	I*1		Spare
SWAALINE	1	I*4		Line number
SWAASDIR	1	I*4		Scan direction
SWAASCNT	1	I*4		Scan number
SWAASTAT	1	I*4		Status word
SWAAFLAG	1	I*4		Flag word

SWS Insrument Data Users Manual, Issue 1.0 (SAI/95-221/Dc), K. Leech, ISO Science Operations, Vilspa, 24 November 1995.

SWS Calibration ("Cal-G" files)

FITS	Mission
Filename	Filename	Description (Click for Details)
SC01	SWS Cal-G 1	Electronic crosstalk matrices
SC02	SWS Cal-G 2	RC Correction timescales
SC03	SWS Cal-G 3	Reset cutout lengths
SC04	SWS Cal-G 4	Amplifier limits
SC05	SWS Cal-G 5	Switchable gains
SC06	SWS Cal-G 6	Glitch reject levels
SC07	SWS Cal-G 7	Grating detector noise
SC08	SWS Cal-G 8	Grating calibration specs
SC09	SWS Cal-G 9	LVDT-Angle relation
SC10	SWS Cal-G 10	Key wavelengths
SC11	SWS Cal-G 11	FP Calibration spectrum
SC12	SWS Cal-G 12	FP Gap-position relation
SC13	SWS Cal-G 13	Relative flux
SC14	SWS Cal-G 14	Intensity of internal cal sources
SC15	SWS Cal-G 15	Intensity of cal sources
SC16A	SWS Cal-G 16A	Aperture effects
SC16B	SWS Cal-G 16B	Element offsets
SC16C	SWS Cal-G 16C	Grating constants
SC16D	SWS Cal-G 16D	Telescope area
SC16E	SWS Cal-G 16E	Scanner curve coefficients
SC18	SWS Cal-G 18	Effective gap relation
SC19	SWS Cal-G 19	Grating FWHM
SC20	SWS Cal-G 20	Relative detector response
SC21_1	SWS Cal-G 21_1	Det. dark current/noise for 1 sec reset
SC21_2	SWS Cal-G 21_2	Det. dark current/noise for 2 sec reset
SC21_4	SWS Cal-G 21_4	Det. dark current/noise for 4 sec reset
SC21_8	SWS Cal-G 21_8	Det. dark current/noise for 8 sec reset
SC22	SWS Cal-G 22	Det. response: diffuse source and flusher
SC23	SWS Cal-G 23	Wave limits for bands
SC24	SWS Cal-G 24	Wave limits for apertures
SC25_1A	SWS Cal-G 25_1A	Spectral responsivity for band 1A
SC25_1B	SWS Cal-G 25_1B	Spectral responsivity for band 1B
SC25_1D	SWS Cal-G 25_1D	Spectral responsivity for band 1D
SC25_1E	SWS Cal-G 25_1E	Spectral responsivity for band 1E
SC25_2A	SWS Cal-G 25_2A	Spectral responsivity for band 2A
SC25_2B	SWS Cal-G 25_2B	Spectral responsivity for band 2B
SC25_2C	SWS Cal-G 25_2C	Spectral responsivity for band 2C
SC25_3A	SWS Cal-G 25_3A	Spectral responsivity for band 3A
SC25_3C	SWS Cal-G 25_3C	Spectral responsivity for band 3C
SC25_3D	SWS Cal-G 25_3D	Spectral responsivity for band 3D
SC25_4	SWS Cal-G 25_4	Spectral responsivity for band 4
SC25_5A	SWS Cal-G 25_5A	Spectral responsivity for band 5A
SC25_5B	SWS Cal-G 25_5B	Spectral responsivity for band 5B
SC25_5C	SWS Cal-G 25_5C	Spectral responsivity for band 5C
SC25_5D	SWS Cal-G 25_5D	Spectral responsivity for band 5D
SC25_6	SWS Cal-G 25_6	Spectral responsivity for band 6

References

ISO SWS Observer's Manual
IA3 User's Manual
IA3 Programmers's Manual
IA3 Reference Manual
Various memos and communications from the SWS Instrument Dedicated Team.

Disclaimer

These are personal notes of J. Mazzarella which are in no way complete or intended to be a substitute for the original SWS document set. They are made available in case they may be of use to others.