Fields in SWS AAR (swaa*) Files

SWAAFLUX: Flux density of data point in Jy.

SWAASTDV: Uncertainty (standard deviation) of flux density in Jy.

SWAATINT: Total integration time in sec.

SWAADETN: Detector number ranging 1-52 defined as follows:

Detector Numbers	Wavelength (um)	Detectors	AOT Band
1-12	2.38-4.05	12* InSb (SW Grating)	1
13-24	4.05-12.0	12* Si:Ga (SW Grating)	2
25-36	12.0-29.0	12* Si:As (LW Grating)	3
37-48	28.9-45.2	12* Ge:Be (LW rating)	4
49-50	11.4-26.0	2* Si:Sb (FP)	5
51-52	26.0-44.5	2* Ge:Be (FP)	6

SWAAITK: SWS instrument time key. For SWS, ITK=UTK.

SWAAUTK: ISO uniform time key. For SWS, UTK=ITK.

SWAARPID: Raster point ID. This is copied from GPSRCPID from the SPD. the two fields always contain 1, since the instrument does not have a raster mode. This field is included only for compatibility with the LWS AAR files (LSANS).

SWAASPAR: Spare. Unused.

SWAALINE: Line number. This is a sequential integer assigned to identify individual line (AOT SWS02) or spectral regions (SWS06, 07). They are assigned in order of observation sequence. There may be up to 64 requested lines (SWS02) or spectral regions (SWS06) in a grating AOT. In theory, the user could request as many as 64 regions for the grating, and 64 simultaneous regions for the FP for SWS07. However, since additional wavelength regions are often observed simultanesouly with the requested region, SWAALINE can have values higher then the number of requested lines or regions. For the full wavelength scan SWS01, assignment of SWAALINE is TBD.

SWAASDIR: The scan direction can be either -1, meaning a DOWN scan, or +1, meaning an UP scan. Note that UP in this context means the grating scanner position number goes up, but the wavelength goes down.

SWAASCNT: Scan number, or count, assigned sequentially in time order of observation for each spectral line (AOT SWS02) or spectral region (AOTs SWS06 & SWS07). The UP and DOWN portions of a scan are assigned the same value of SWAASCNT for SWS02. For the full wavelength scan SWS01, assignment of SWAASCNT is TBD.

SWAASTAT: Status word. These are bits set as follows: )

Bits set	Meaning	Value
00000000000000000000000000000000	Dark	0
00000000000000000000000000000001	Aperture 1	1
00000000000000000000000000000010	Aperture 2	2
00000000000000000000000000000011	Aperture 3	3
00000000000000000000000000000100	Reset band 1 & 2	4
00000000000000000000000000001000	Reset other bands	8
00000000000000000000000000001100	Reset all bands	12
00000000000000000000000000010000	Diffuse cal normal	16
00000000000000000000000000110000	Diffuse cal high	48
00000000000000000000000001000000	FP check normal	64
00000000000000000000000011000000	FP check high	192
00000000000000000000000100000000	Flusher normal	256
00000000000000000000001100000000	Flusher high	768
00000000000000000000010000000000	Grating check normal	1024
00000000000000000000110000000000	Grating check high	3072
00000000000000000001000000000000	FP 2 active	4096
00000000000000000010000000000000	Band 1 requested	8192
00000000000000000100000000000000	Band 2 requested	16384
00000000000000001000000000000000	Band 3 requested	32768
00000000000000010000000000000000	Band 4 requested	65536
00000000000000100000000000000000	Band 5 requested	131072
00000000000001000000000000000000	Band 6 requested	262144
00000000000010000000000000000000	FP execute flag	524288
00000000000100000000000000000000	FP run flag	1048576
00000000001000000000000000000000	Low resolution flag	2097152
00000000010000000000000000000000	Reference scan	4194304
00000000100000000000000000000000	Photometric check	8388608
00000001000000000000000000000000	Defined dark measurement	16777216
00000010000000000000000000000000	SWS grating run flag	33554432
00000100000000000000000000000000	LWS grating run flag	67108864
00001000000000000000000000000000	SW scan direction	134217728
00010000000000000000000000000000	LW scan direction	268435456
00100000000000000000000000000000	Free	536870912
01000000000000000000000000000000	Free	1073741824
10000000000000000000000000000000	Free	2147483648

NOTE: The bits can be summed.

SWAAFLAG: Flag word

Bits set	Meaning	Value
2^0	1 glitch	1
2^1	2 glitches	2
2^0+2^1	multiple glitches	3
2^2	Partly out of limit	4
2^3	All points out of limit	8
2^4	No data	16
1*2^5 (2^5)	Grating order 1	32
2*2^5 (2^6)	Grating order 2	64
3*2^5 (2^5+2^6)	Grating order 3	96
4*2^5 (2^7)	Grating order 4	128
7*2^5 (2^5+2^6+2^7)	Multiple orders	224
2^8	Free	256
1*2^9	Gain 1	512
2*2^9 (2^10)	Gain 2	1024
3*2^9 (2^9+2^10)	Gain 3	1536
2^11 to 2^29	Free	---
2^30	MASK bit (for ISAP)	2^30

NOTE: The bits can be summed.

References