[daip] possible errors in CLCOR parallactic angle corrections (OPCOD 'PANG')

[Dan Lebach]

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Hello,

I write to inform you of a finding from my analyses of dual pol. VLBA
data (3.6 cm) that perhaps suggests an error in parallactic angle
corrections computed by CLCOR (OPCODE = 'PANG').

In support of the Gravity Probe B mission, I have evaluated over a
dozen dual-pol. VLBI experiments at 3.6 cm that involve the VLBA.
One of the checks I make on the results I get from FRING after
instrumental calibration that includes parallactic angle corrections
is to difference the RCP phases from the LCP phases and plot the
differences for a strong extragalactic source (3C454.3) for which the
SNR-derived uncertainty of the phase measurements is << 1 deg.  You
can see sample plots of such phase differences in the attached
postscript file.  For all VLBA sites other than SC and MK, I
generally see phase differences that are roughly flat and
< 2 degrees.  For SC and MK, however, I NEVER see that.  In
experiment after experiment, I see phase differences that quite
suddenly shift at some point during the experiment, just as can be
seen in the plots.  I think the phase differences peak consistently
in magnitude at ~11 deg. for SC and ~4 deg. for MK.

A review of the hour angle when the sudden changes in phase
difference occur reveals the cause of the problem: the sharp changes
in phase differences occur when the source is at transit.  As it
happens, the extragalactic source I'm using for these studies is at
about 16 deg. declination, so for SC and MK, the source at transit is
also nearly at zenith (~88.5 deg. elevation at SC; ~86.5 deg.
elevation at MK).  Evidently the modelling is breaking down at these
very high elevations, when the antenna is nearly spinning about its
central axis to track the source.

The phase differences between RCP and LCP are not large enough to
cause significant errors in the astrometric measurements that we
attempt to make from our observations, so I am not requesting any
specific action.  Rather, I write merely to bring this issue to your
attention.

Note that in the plots:
F = FD
K = MK
O = OV
S = SC

Sincerly,
Daniel Lebach

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| Daniel E. Lebach         ! Harvard-Smithsonian Center for Astrophysics |
| dlebach at cfa.harvard.edu  ! 60 Garden Street, MS 42                     |
| Voice: (617) 495-7150    ! Cambridge, MA  02138                        |
| Fax:   (617) 495-7345    ! USA                                         |
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