[daip] Antenna elevation information for CP calibration in AIPS {External}

[Eric Greisen]

Try LISTR  OPTYPE='GAIN' INEXT-'CL' DOCRT=-3 set OUTPRINT to some file name dparm(1)=11

Eric  Greisen
________________________________
From: Ioannis Myserlis <imyserlis at iram.es>
Sent: Friday, November 21, 2025 8:51 AM
To: Eric Greisen <egreisen at nrao.edu>
Subject: Antenna elevation information for CP calibration in AIPS {External}

Dear Eric,

I’m not sure if this is the right channel to address this question. If not, please let me know to who I should write instead.

I am analyzing 43 GHz (7mm) VLBA data with AIPS to calibrate and image the circular polarization (CP) signal of my targets (AGN jets). During our analysis we see some evidence of the beam squint effect that is introducing instrumental CP to the observations. To address this effect and hopefully mitigate it we would like to perform and elevation-dependent analysis (which is the main parameter affecting beam squint) and for that we need to recover the elevation of each antenna at any given scan in the experiment.

Is there a possibility to extract this information through AIPS in a metadata or table format? I hope my question is not too naive and apologize in that case.

Best regards and many thanks for your continued efforts on A|PS!

Ioannis Myserlis

--
Staff Astronomer
Instituto de Radioastronomía Milimétrica
Avenida Divina Pastora 7, Granada, 18012, ES
e-mail: imyserlis at iram.es<mailto:imyserlis at iram.es> | phone: +34 958 805 454, ext. 225, 278
https://www.iram.fr/~imyserlis





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