FITS Keywords for SXI M Level 1 Image products
2001-05-03 SMH
FITS Primary Header
FITS Keyword	FITS Value Format	Pass-through	Contents	Range	Units	Notes
SIMPLE	logical		T, indicating FITS conformance	T
BITPIX	integer		Type indicator for Data Array	-32
NAXIS	integer		Number of axes in Data Array	2
NAXIS1	integer		Length of Data Array Axis 1	512	pixels
NAXIS2	integer		Length of Data Array Axis 2	512	pixels
EXTEND	logical		Indicates possibility of extension HDUs	T
BLANK	string		Undefined Data Array Value	'NaN     '
DATE	string		Date/time FITS file written			1
FILENAME	string		FITS file name, SXI convention			2
CRPIX1	real		Reference column coordinate, pixel#	256.5	pixels
CRPIX2	real		Reference row coordinate, pixel#	256.5	pixels
CRVAL1	real		Reference column coordinate, arcsec	0	arcsec
CRVAL2	real		Reference row coordinate, arcsec	0	arcsec
CDELT1	real		Pixel width, arcsec	5	arcsec
CDELT2	real		Pixel height, arcsec	5	arcsec
CTYPE1	string		Definition of column data units	'ARCSEC  '
CTYPE2	string		Definition of row data units	'ARCSEC  '
CROTA	real		Image rotation angle, degrees CCW	[0,360]	degrees
XCEN	real		Center of Image relative to Center of Sun, N-S	[-5400,5400]	arcsec
YCEN	real		Center of Image relative to Center of Sun, E-W	[-5400,5400]	arcsec
BZERO	real		Intercept for conversion from DN to ph		photons
BSCALE	real		Sllope for conversion from DN to ph		photons/DN
DATE_OBS	string	Yes	Earth-adjusted time of observation, UT			1
DATE-OBS	string	Yes	Time of observation at S/C, UT			1
TELESCOP	real	Yes	Spacecraft identification	'GOES-12 '
INSTRUME	string	Yes	Instrument identification	'SXI-0   '
OBJECT	string	Yes	'SUN', 'DARK', 'UV_TEST', 'OFFPOINT'
IMG_CODE	string		Image intent 'FL','AR','CS','CH','BG' etc.
VERINGST	string	Yes	Level 0 ingest version 'nnn.nnn'
VERLEVL0	string	Yes	Level 0 processing version 'nnn.nnn'
LEVEL0ID	string		Filename of input Level 0 image file
SHRTDARK	string		Filename of short dark frame used
LONGDARK	string		Filename of short dark frame used
VERLEVL1	string		Level 1 processing version	1
WAVELNTH	string	Yes	Filter mnemonic
EXPTIME	real	Yes	Actual Image integration time (sec)	[0.0,65.536]	seconds
MCP1K_V	real	Yes	Actual MCP 1kV voltage	[0,2125]	volts	3
MCP5K_V	real	Yes	Actual MCP 5kV (phosphor) voltage	[0,10625]	volts	3
RSLT_SFF	string	Yes	Packed resultant SFF
IMAG_SFF	string	Yes	Packed image SFF
GLBL_SFF	string	Yes	Packed global SFF
LIN_LOG	string	Yes	Linear/Logarithmic Output	'LIN     '.'LOG   '
LIN_DSBL	logical	Yes	Disable Line Advance	T,F
SAD_DSBL	logical	Yes	Disable SADA Synchronization	T,F
EXP_INDX	integer	Yes	Exposure setting index	314
INT_TIME	real	Yes	Integration time setting, s	[0.0,65.535]	seconds
SADA_OFF	real	Yes	SADA offset time setting, s	[0.0,8.191]	seconds
MCP_GAIN	real	Yes	MCP Gain setting, volts	[0,2500]	volts
MCP_PHOS	real	Yes	MCP Phosphor setting, volts	[0,12500]	volts
MCP_TMP	real	Yes	Ch 5, MCP Temperature Deg. C.	[-273,577]	Deg. C
CCD_TMP	real	Yes	Ch 6, CCD Assembly Temperature Deg. C.	[-273,577]	Deg. C
IMG_WDI	real		Image summed whole-disk intensity		TBD
IMG_MIN	real		Image minimum intensity (units TBD)		TBD
IMG_MAX	real		Image maximum intensity (units TBD)		TBD
IMG_MED	real		Image median  intensity (units TBD)		TBD
IMG_MEAN	real		Image mean    intensity (units TBD)		TBD
IMG_SDEV	real		Image std dev intensity (units TBD)		TBD
MISS_PIX	integer		Level-0 missing pixel count	[0,???]	pixels
MISS_LIN	integer		Level-0 missing line count	0	lines
FIX_PIX	integer		Count of missing pixels that were filled in	0	pixels
FIX_LIN	integer		Count of missing lines that were filled in	0	lines
MED_PIX	integer		Count of median filter corrected pixels	0	pixels
MED_THRS	real		Threshold for meding filter correction	0	TBD
SAT_PIX	integer		Level-0 saturated pixel count	0	pixels
FITS Primary Data Array - Pixel Data Array - absent if NAXIS = 0 above
pixels	32 bit IEEE Float		Pixels with parity errors (or missing) are set to NaN.		TBD
Note 1			The string has the form yyyy-mm-ddThh:mm:ss.sss
ISO 8601 Date/Time Strings			The T between the date and the time is ugly, but part of the standard.
			The seconds field provides millisecond precision.
			Smoothed UTC is always used. Z is not appended to the string.
Note 2			The string has the form prdctn_yyyymmdd_hhmmss_AA_12, where
Sxi Product File Names			prdctn is the 3-6 character product name: SXI, MCPSI, UVBI, or XPDIAG
			The yyyymmdd_hhmmss field is derived from the DATE_OBS value.
			The two letters of the AA field are codes for the processing level and software version.
Note 3			Value undefined if there was no Tsync packet.