SOT-FG FITS Keywords

The following table lists the keywords found in the FITS headers for Level 0 SOT-FG data.

KeywordTypeDescription
CRPIX1FltHorizontal position of the reference pixel in the data, e.g., the center of the CCD (e.g., 1024.5) [pixels]
CRPIX2FltVertical position of the reference pixel in the data, e.g., the center of the CCD (e.g., 512.5) [pixels]
CRVAL1FltHeliocentric coordinates (X) of the reference pixel specified by CRPIX1 [arcsec]
CRVAL2FltHeliocentric coordinates (Y) of the reference pixel specified by CRPIX2 [arcsec]
CDELT1FltPixel scale in the horizontal (X) direction [arcsec/pixel]
CDELT2FltPixel scale in the vertical (Y) direction [arcsec/pixel]
CUNIT1StrUnit of CRVAL1 (e.g., arcsec)
CUNIT2StrUnit of CRVAL2 (e.g., arcsec)
CTYPE1StrLabel of the first dimension of the data (e.g., Solar-X)
CTYPE2StrLabel of the second dimension of the data (e.g., Solar-Y)
XSCALEFltPixel scale in the horizontal (X) direction [arcsec/pixel]
YSCALEFltPixel scale in the vertical (Y) direction [arcsec/pixel]
EXP0FltMeasured exposure duration [sec]
TIMESPANFltTime span to get the image [sec]
OBS_IDIntNumerical identifier that correlates to OBS_TYPE, but note that there is many-to-one correlation between OBS_ID and OBS_TYPE
GEN_IDIntNumerical identifier with a one-to-one correspondence to OBS_TYPE
FRM_IDIntNumerical identifier of frame definition block
WAVEIDIntNumerical identifier of observed wavelength
FGXOFFIntX offset for ROI definition [arcsec]
FGYOFFIntY offset for ROI definition [arcsec]
FGCCDIX0IntIndex of the first pixel in the CCD X-direction (e.g., 0) [pixels]
FGCCDIX1IntIndex of the last pixel in the CCD X-direction (e.g., 4095) [pixels]
FGCCDIY0IntIndex of the first pixel in the CCD Y-direction (e.g., 0) [pixels]
FGCCDIY1IntIndex of the last pixel in the CCD Y-direction (e.g., 2047) [pixels]
XCENFltHeliocentric coordinate (X) at the center of the image [arcsec]
YCENFltHeliocentric coordinate (Y) at the center of the image [arcsec]
FOVXFltWidth of the field-of-view in the X direction [arcsec]
FOVYFltWidth of the field-of-view in the Y direction [arcsec]
FGBINXIntPixels summed in the X direction by the on-board software
FGBINYIntPixels summed in the Y direction by the on-board software
DARKFLAGIntIndicates whether the shutter is open (0) or closed (1)
FGMODEStrIndicates the FG camera mode (either shuttered or shutterless)
FGNINTIntIndicates how many images are integrated
ROILOOPIntIndicates whether the ROI loop is used in the shutterless mode (either 0 or 1)
NROILOOPIntNumber of ROI loops used when in shutterless mode
MASKIntPosition of NFI mask wheel [steps]
WBFWIntPosition of BFI filter wheel [steps]
NBFWIntPosition of NFI filter wheel [steps]
TF1IntPosition of tunable filter motor 1 [steps]
TF2IntPosition of tunable filter motor 2 [steps]
TF3IntPosition of tunable filter motor 3 [steps]
TF4IntPosition of tunable filter motor 4 [steps]
TF5IntPosition of tunable filter motor 5 [steps]
TF6IntPosition of tunable filter motor 6 [steps]
TF7IntPosition of tunable filter motor 7 [steps]
TF8IntPosition of tunable filter motor 8 [steps]
WBEXPIntBFI last requested exposure time [msec]
NBEXPIntNFI last requested exposure time [msec]
WAVEOFFIntOffset from baseline wavelength of observable given in WAVE [mÅ]
ROISTARTIntCamera read-out parameter of ROI start
ROISTOPIntCamera read-out parameter of ROI stop