[CALIBRATE\]SCALE_FLUX Find|Apply|List|Calibrate [Args...]
A set of commands to check flux calibration on a day to day basis. It
gives the ratio between the observed flux (in the current UV data set)
and the model flux for each separate period. The Model flux can be de-
rived from Clean Component Tables using the MODEL command, or read from
an outer file using READ MODEL.
Error bars are approximate. The User-defined command SOLVE_FLUX performs
a more accurate evaluation of the error, but is typically 50 times slow-
er.
SCALE_FLUX FIND [DateTolerance [UVmin UVmax]]
determines, by linear regression, the best scaling factor to match date
by date the UV data set with the MODEL data set. Separate Periods are
defined when Dates differ more than DateTolerance (default 1 day). Only
data with baseline lengths in the range UVmin UVmax are considered for
the regression (default all).
SCALE_FLUX APPLY VarName
apply previously determined flux scale factors to the MODEL data set,
previously read by READ MODEL. This is in general used only in an itera-
tive search way, e.g. by the user-defined command SOLVE_FLUX (which
calls procedure solve_flux). The resulting UV data set is loaded into
the specified VarName SIC variable.
SCALE_FLUX LIST
print out dates, baselines and determined flux factors
SCALE_FLUX CALIBRATE
apply previously determined flux scale factors to the current UV data
set (i.e. divide the visibilities by the scaling factor of each date,
and correct the weight accordingly). This may then be written using
command WRITE UV .
SCALE_FLUX SOLVE [DateTolerance [UVmin UVmax]]
combines FIND and PRINT behaviours.
Gildas manager
2023-06-01