KEYWORD gives the name of the FITS keyword and may be up to 8 characters.
TYPE refers to the data type and the size of the data:
S String I Integer R RealThe size of the data depends upon the data type. For example S*2 is a 2 character string, whereas I*2 is a 2 byte integer (16 bits).
VALUES shows the range of values that the KEYWORD can take.
DESCRIPTION gives a short description of the keyword.
KEYWORD TYPE VALUES DESCRIPTION
SIMPLE S*1 T Conforms to FITS standard
BITPIX I*2 8,16,32 Number of bits per pixel
NAXIS I*2 2 Number of axes in the image
NAXIS1 I*2 Positive Length of the first axis (columns)
Number
NAXIS2 I*2 Positive Length of the second axis (rows)
Number
TELESCOP S*8 SOHO Name of the satellite
INSTRUME S*8 LASCO Name of the instrument
DETECTOR S*8 C1,C2,C3 Name of the telescope within LASCO
FILENAME S*30 Any Name of the FITS file. For the
archive data we conform to the DOS
8.3 standard.
FILEORIG S*17 Any Name of the raw telemetry file in
the format YYMMDD_HHMMSS.img. The
implied date and time are the date
and time stamp of when the data
were put into the telemetry stream.
DATE S*23 Any Date of file generation in CSSDS
standard format, eg
1996/05/21 17:28:48.208
DATE-OBS S*10 Any Date of the start of the exposure,
eg: 1996/05/20
TIME-OBS S*12 Any Time of the start of the exposure,
eg: 00:40:05.407
MID_DATE I*2 Any Modified Julian Date at the mid-
point of the exposure
MID_TIME R*4 Any Number of seconds of the day at the
mid-point of the exposure
OBT_TIME R*4 Any Value of the On-Board Time
EXPTIME R*4 Any Number of seconds of the exposure time
EXP0 R*4 Any Measured exposure delay time
EXPCMD R*4 Any Commanded exposure delay time
EXP1 R*4 Any Length of time since CCD clear
EXP2 R*4 Any Length of time to open shutter
EXP3 R*4 Any Length of time to close shutter
READPORT S*1 A,B,C,D CCD readout port
SUMROW I*2 0,2,4 Number of rows being summed on the CCD
SUMCOL I*2 0,2,4 Number of columns being summed on the CCD
LEBXSUM I*2 1,2,4,.. Number of columns being summed in the LEB
LEBYSUM I*2 1,2,4,.. Number of rows being summed in the LEB
SHUTTR I*2 0 Shutter was commanded open during the exposure
1 Shutter was not commanded during the exposure
LAMP I*2 0 Calibration lamp was not commanded on
1 Calibration lamp was commanded on
FILTER S*8 Clear Position of the filter wheel
Orange
FeXIV
FeX
CaXV
Blue
Red
IR
Lens
POLAR S*8 Clear Position of the polarizer wheel
0 deg
+60 deg
-60 deg
H alpha
ND
LP_NUM S*8 Normal Description of the LEB Program (LP) used to
Cal Lamp generate the image
Dark
Line Scan
Pol Seq
OS_NUM I*2 Any Observing Sequence Number
An arbitrary number that specifies similar
instrument configuration and can be used to search
the data base for other exposures taken under the
same conditions.
IMGCTR I*2 Any Sequential counter since the last LEB reboot
IMGSEQ I*2 Any Number of the image in the current sequence,
starting at 0
COMPRSSN S*8 Code indicating the steps used in compressing the
data
PLATESCL R*4 Any Number of arc seconds per pixel
OFFSET I*2 Any Electronic offset in DN
P1COL I*2 Any CCD column number of start of image, 0-19 are
underscan pixels, 20-1043 are imaging pixels, 1044
- 32000 are overscan pixels
P1ROW I*2 Any CCD row number of start of image, 1-1044 are
imaging rows, 1025-32000 are overscan rows
P2COL I*2 Any CCD column number at end of image, 0-19 are
underscan pixels, 20-1043 are imaging pixels, 1044
- 32000 are overscan pixels
P2ROW I*2 Any CCD row number at end of image, 1-1044 are
imaging rows, 1025-32000 are overscan rows
RECTIFY S*8 TRUE Status of rectification to put solar north
FALSE to the top of the image
R1COL I*2 Any The rectified coordinate, equivalent to P1COL, as
though the image had been read out with this
coordinate
R1ROW I*2 Any Rectified P1ROW
R2COL I*2 Any Rectified P2COL
R2ROW I*2 Any Rectified P2ROW
EFFPORT S*8 A,B,C,D Rectified read out port
VERSION I*2 Any Version number of LEB header
DATAMIN R*4 Any Minimum value of the image, including the bias
DATAMAX R*4 Any Maximum value of the image
DATAZER I*4 Any Number of zero pixels in the image
DATASAT I*4 Any Number of saturated values in the image
DATAAVG R*4 Any Average value of the image
DATASIG R*4 Any Standard deviation in computing the average
DATAP01 I*4 Any Intensity of 1st percentile of image
DATAP10 I*4 Any Intensity of 10th percentile image
DATAP25 I*4 Any Intensity of 25th percentile of image
DATAP75 I*4 Any Intensity of 75th percentile of image
DATAP90 I*4 Any Intensity of 90th percentile of image
DATAP95 I*4 Any Intensity of 95th percentile of image
DATAP98 I*4 Any Intensity of 98th percentile of image
DATAP99 I*4 Any Intensity of 99th percentile of image
CRPIX1 R*4 Any Column number of the reference pixel. SOHO
practice has been to use this as the center of the
sun.
CRPIX2 R*4 Any Row number of the reference pixel. SOHO
practice has been to use this as the center of the
sun.
CRVAL1 R*4 Any Number of arc seconds of the center of the sun
from the reference position in the azimuthal
direction (E-W). Positive is to the solar west
CRVAL2 R*4 Any Number of arc seconds of the center of the sun
from the reference position in the elevation
direction (N-S). Positive is to solar north
CROTA1 R*4 Any Rotation of axis 1 with respect to solar north
Positive is westward (clockwise)
CROTA2 R*4 Any Rotation of axis 2 with respect to solar north
Positive is westward (clockwise)
CTYPE1 S*8 SOLAR-X Type of units of axis #1
CTYPE2 S*8 SOLAR-Y Type of units of axis #2
CUNIT1 S*8 ARCSEC Units along axis #1
CUNIT2 S*8 ARCSEC Units along axis #1
CDELT1 R*8 Any Increment along axis #1 (Same as PLATESCL)
CDELT2 R*8 Any Increment along axis #1 (Same as PLATESCL)
HISTORY S*80 Any History of processing. Can be repeated
COMMENT S*80 Any Comments. Can be repeated
END Last keyword in the FITS header