[daip] [!12019]: AIPS - AIPS clcorprm(8,9) reference time

[Eric Greisen]

Eric Greisen updated #12019
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       Staff (Owner): Eric Greisen (was: -- Unassigned --)

AIPS clcorprm(8,9) reference time
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           Ticket ID: 12019
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/12019
                Name: Jackie Villadsen
       Email address: jrv at astro.caltech.edu
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 09 May 2018 12:25 AM
             Updated: 09 May 2018 10:33 PM
           Reply due: 11 May 2018 12:25 AM (1d 1h 51m)
      Resolution due: 02 February 2021 12:00 AM (999d 1h 26m)

A good question and I am not sure I am happy with the answer.It uses IAT 0 on the reference date.  In other words it      RAINT = CLCORP(8) * Timewhere time 0 is midnight IAT on the header reference date.Assuming the observation was made at a position relevantto the start of the first scan on uvceti then it over-correctsby the time of that first scan.  I suspect that (when INFILEis not used) there should be a t0 specified in some way,e.g. CLCORP(10) or something.I am assuming that uvceti had a constant coordinate through the data set and now needs phase shifting sothat all times line up.  I expect that the zero time is notall that important but you will need to take the imagedcoordinate and correct for the t0.Eric Greisen


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