Translation of IHAP header

The IHAP header contains the description of the data in a fixed, binary format. With reference to the IHAP manual, the translation of this information into MIDAS descriptors are given in Table 7.2.1. IHAP defines the end of exposure which is converted to exposure time. Also, start and end are given for image axes instead of start and number of pixels

 

Table 7.5: Name translation between IHAP header and MIDAS descriptors. Asterisk indicates that the value is transformed (see text).

IHAP header	MIDAS descriptor	IHAP header	MIDAS descriptor
DRASC	O_POS(1)	JUSR1	IHAPUSER(1)
DECLN	O_POS(2)	JUSR2	IHAPUSER(2)
JYEAR/JDAT	O_TIME(1)	DUSR1	IHAPUSER(3)
DCRAT	O_TIME(5)	DUSR2	IHAPUSER(4)
DSTTM	O_TIME(6)	AHGC	LHCUTS(2)
DENTM	O_TIME(7)*	ALWC	LHCUTS(1)
JDENT	IDENT	DAIRM	O_AIRM
DXSTR/DYSTR	START
DXSTP/DYSTP	STEP
DXEND/DYEND	NPIX*

 

In addition to the main header, keywords and comments may exist. They are saved in the descriptor O_COM in ASCII format.