AIPS NRAO AIPS HELP file for SPECURVE in 31DEC22



As of Sun Dec 4 7:42:05 2022



HELP SECTION

SPECURVE
Type: Adverb (Real array(3))
Use:  Spectral index curvature defined so that the flux density goes
      as

            log(T(f)/T(f0) = S * log(f/f0) + C(1) * (log(f/f0))^2
               + C(2) * (log(f/f0))^3 + C(3) * (log(f/f0))^4

      where S is SPECINDEX and C is SPECURVE, f0 is 1 GHz for
      simplicity, and all logs are base 10.  It is unlikely for you to
      have reliable values for SPECURV(3); SETJY uses only through
      SPECURVE(2) for the basic flux calibration sources.

Tasks:
  BLCHN.....Compute closure offset corrections on a channel-by-channel
            basis.  Curvature value with f0 1 GHz.
  BPASS.....Computes spectral bandpass correction table.
            SPECURVE is used to remove curvature from the derived
            bandpass amplitude spectrum.  f0 is the frequency in the
            UV data set header and is independent of IF and channel.
  CPASS.....Computes polynomial spectral bandpass correction table
            Curvature value with f0 1 GHz.
  EVAUV.....Subtracts & divides a model into UV data, does statistics
            on results.  Spectral curvature if using SMODEL with f0
            the header frequency.
  SETJY.....Task to enter source info into source (SU) table.
            Curvature value with f0 1 GHz.
  SOUSP.....Fits SPECINDX and SPECURVE to the fluxes in an SU table
            returning the values for input to BPASS.et al.

EXPLAIN SECTION


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