field brightness

field brightness

[′fēld ‚brīt·nəs]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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On a good night with a Sky Quality Meter (SQM) reading of the sky background at 21.4 mag/[arcsec.sup.2], I estimate the faintest visible portions of the M81/M82 cirrus are 25.5 mag/[arcsec.sup.2], offering a contrast of a scant several percent in terms of field brightness.
OMA is the difference between the observed field brightness temperature and the analysis field brightness temperature value, and OMB is the difference between the observed field brightness temperature value and the background field brightness temperature value.