EUV FITS Header Definitions

The following table describes the FITS header for EUV combined-frame images in the EUV FITS archive and full-frame EUV images. For more information on the FITS standard, please see Definition of the Flexible Image Transport System (FITS).

keyworddefinitionsystemunitscomments
SIMPLEstandard FITS header?boolean-always true
BITPIXbits per pixel--32 bit IEEE floating point pixel values
NAXISimage dimensions--always 2
NAXIS1horizontal image dimension-pixels140 for standard EUV fits images, 600 for full-frame images
NAXIS2vertical image dimension-pixels150 for standard EUV fits images, 140 for full-frame images
LINEARcounts in the image are linear?boolean-very early FITS images had logarithmic counts
OVERLAPpixel overlap used when combining the images from the 3 cameras-pixels
TAUspins per frame-spinsthis is always 5 (so far)
IMTIMEcamera 0 start time--This shouldn't be used, use JUL_DAY instead to define the frame time
IMAGE_XIMAGE satellite X positionGCIkm
IMAGE_YIMAGE satellite Y positionGCIkm
IMAGE_ZIMAGE satellite Z positionGCIkm
IMAGE_VXIMAGE satellite X velocityGCIkm/sec
IMAGE_VYIMAGE satellite Y velocityGCIkm/sec
IMAGE_VZIMAGE satellite Z velocityGCIkm/sec
SUN_XSun X positionGCIkm
SUN_YSun Y positionGCIkm
SUN_ZSun Z positionGCIkm
MOON_XMoon X positionGCIkm
MOON_YMoon Y positionGCIkm
MOON_ZMoon Z positionGCIkm
IMAGELATIMAGE satellite latitudeGCIdegrees
IMAGELONIMAGE satellite longitudeGCIdegrees
IMAGWLONIMAGE satellite West longitudeGEOdegrees
IMAGSLONIMAGE satellite Solar longitudeGCIdegreesangle of the Sun from IMAGE (increasing eastward)
SPINAXXIMAGE satellite spin axis X componentGCI-unit vector
SPINAXYIMAGE satellite spin axis Y componentGCI-unit vector
SPINAXZIMAGE satellite spin axis Z componentGCI-unit vector
JUL_DAYJulian day of midpoint of the combined EUV framedays