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SOLVE FLUX
CLIC\SOLVE FLUX [NOREFERENCE] [BEST n] [REAL] [/RESET]
*** THIS HELP HAS NOT BEEN UPDATED FOR THE NGRX ***
Calculate the fluxes of the sources in the current index or the antenna
efficiencies (Jansky to Kelvin) if the source flux is known. The command
can also be used to bootstrap source fluxes from a known source.
It should be used before computing any amplitude calibration, on an index
covering a reasonably short time interval to avoid possible efficiency
variations.
The commands should be used in the following way:
- The command SET FLUX is used to define the flux of one, or several of
the sources in the current index for which the flux is known. Frequen-
cies and dates may be specified.
- Then the command SOLVE FLUX will use the sources of known flux (op-
tionally with matching frequencies and dates) to determine the effi-
ciencies for all antennas. SOLVE FLUX now gives the decorrelation fac-
tor relative to the efficiencies logged in the scan headers (assumed
to be the standard single-dish efficiencies).
- SOLVE FLUX then uses these antenna efficiences to compute the fluxes
of all other sources. IF the keyword "BEST n" is present, the n anten-
nas giving the highest fluxes will be used for averaging (n is 1 to
the number of available antennas). Default is n=3.
- The command SHOW FLUX will give the current flux list. The reference
sources are listed with a "FIXED" keyword, while the fluxes determined
by SOLVE FLUX are listed as "FREE".
- SOLVE FLUX /RESET can be used to reset the flux list (i.e. remove from
the list all sources whose flux is not fixed) before processing.
- The command PRINT FLUX will create a procedure that may be used later
to reload these fluxes in CLIC, if needed.
- The command PRINT FLUX will create a procedure that may be used later
to reload these fluxes in CLIC, if needed.
- The command STORE FLUX will store the fluxes and efficiencies in the
headers of the observations in the current index.
If no reference sources are available, the keyword NOREFERENCE should be
given, and the default efficiencies stored in the data header will be used
(step 2 in the above list is bypassed).
The keyword REAL forces SOLVE FLUX to use the real part of the visibili-
ties instead of the amplitude to derive the antenna efficiencies and
source fluxes. This is only for test purposes and must not be used without
asking an expert.
Gildas manager
2011-04-01