AIPS HELP file for ROTMEAS in 31DEC25

As of Thu Nov 13 13:03:26 2025

HELP SECTION

ROTMEAS
Type: Adverb  (real)
Use:  Used to tell a task a rotation measure in radians per meter
      squared.

Null value:  0 -> no rotation measure

Tasks:
   RLDIF.........Determines Right minus Left phase difference, corrects
                 cal files.  ROTMEAS applies to the first calibration
                 source.
   SPLIT.........Converts multi-source to single-source UV files with
                 calibration.  It ROTMEAS is not zero, the output is
                 forced to IQUV or RR/LL/RL/LR Stokes and Q and U are
                 corrected by the rotation measure into the values they
                 would have at 0 wavelength.
                     Qout = Uin sin(2D) + Qin cos(2D)
                     Uout = Uin cos(2D) - Qin sin(2D)
                     RLout = RLin (cos(2D) - j sin(2D))
                     LRout = LRin (cos(2D) + j sin(2D))
                 where j = sqrt(-1) and D = ROTMEAS * Lambda^2.

EXPLAIN SECTION