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As explained in section 3.3.2, there are usually two
spectra per observation: one which is the simple average of all the
dumps within the observations, one for which each individual spectra
is corrected by a phase
, where
is the
correction for atmospheric phase derived from the Water Vapor
Radiometer (WVR) for antenna
, prior to the averaging. For older
data (before 2006), the 1mm total power data have also been used to
monitor atmospheric phases (see HELP MONITOR).
STORE CORRECTION can be used to store in the observation
header whether the atmospheric phase correction is valid or
not. Besides the GOOD or BAD keywords, keyword
AUTO is the one that is recommended to be used. It will
compare the amplitude of the phase corrected or uncorrected data (with
a bias toward uncorrected data) on calibrators, and then automatically
decide which should be used for the science scans according to the
closest in time phase calibrator correction validity.
Gildas manager
2024-04-19