EIT data are stored in FITS files.
EIT images are store as 16 bits/pixel non-signed integer images
Number of dimensions
NAXIS=3 data cube
DATE = '23/04/98' / Date of file creation
TIME-OBS= '23:39:25' /
DATE-OBS= '29-FEB-96' / UTC at spacecraft
ORIGIN = 'Rocket Science' / Rocket Science = NASA GSFC
DATASRC = 'LZ file ' /
TELESCOP= 'SOHO' /
INSTRUME= 'EIT' /
OBJECT = 'full FOV' /
BSCALE = 1. /
BZERO = 0. /
BUNIT = 'counts / pixel ' /
WAVELNTH= 284 / 171 = Fe IX/X, 195 = Fe XII,
/ 284 = Fe XV, 304 = He II
FILTER = 'Al +2 ' /
DATE_OBS= '1996-02-29T23:39:25.428Z' /
SCI_OBJ = '284 SEQUENCE IN AL INF ' /
OBS_PROG= '284_60SEC_ALINF.000 ' /
CMP_NO = 1 / Unique campaign instance (1 = synoptic)
EXPTIME = 62.100 / s (total commanded + shutter close)
EXPMODE = 'backside ' /
FILENAME= 'efz19960229.233925' /
CFTEMP = -66.71 / CCD cold finger temperature (C)
CCDTEMP = 7.55 / CCD temperature (DN/100)
CTYPE1 = 'Solar-X ' /
CTYPE2 = 'Solar-Y ' /
Note : the lower left corner pixel is (1, 1)
The EIT plate scale is identical in X and Y.
The apparent solar photospheric radius expressed in EIT pixel. The size of an EIT pixel is 2.269 arcseconds and is contained in the CDELT1 and CDELT2. The apparent solar photospheric radius varies with the Sun to SOHO distance.
SOLAR_B0= -7.21 / Degrees
SC_X0 = 0.00 / s/c yaw (arc sec)
SC_Y0 = 0.00 / s/c pitch (arc sec; -109.14 after 1996/04/16)
SC_ROLL = -0.05 / s/c roll (deg.,
Solar north + CCW from nominal)
HEC_X = -138886544.00 / s/c heliocentric ecliptic x (km)
HEC_Y = 48173424.00 / s/c heliocentric ecliptic y (km)
HEC_Z = 91409.52 / s/c heliocentric ecliptic z (km)
CAR_ROT = 1906.00 / Carrington rotation at earth
COMMENT CORRECTED DATE_OBS = '1996-02-29T23:39:25.428Z'
COMMENT COMMANDED EXPOSURE TIME = 60.000 s
COMMENT SHUTTER CLOSE TIME = 2.100 s
COMMENT LINE_SYNC = 'no'
COMMENT CAMERA_ERR = 'no'
COMMENT IMAGE_OF_SEQ = 0
COMMENT READOUT PORT = 'B'
COMMENT NUM_LEB_PROC = 3
COMMENT LEB_PROC = 26 (no ROI)
COMMENT LEB_PROC = 27 (no occ mask)
COMMENT LEB_PROC = 12 (Rice)
Size of the image in blocks. A block is 32x32 pixels.
Coordinates of the lower left and top right corner of the image. The 20 first lines (lines 0 to 19) are "virtual" lines.
COMMENT N_MISSING_BLOCKS = 0
HISTORY Version 4.0, 2001 December 10, Pointing update.