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<b> Ticket Information: </b>
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View this ticket online: <a href="https://help.nrao.edu/app#/t/ticket/41823" title="(#)" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">https://help.nrao.edu/app#/tickets/t/41823</a>
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Andy Biggs <andrew.biggs@stfc.ac.uk> </td>
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Awaiting Agent
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Unsupported OS
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Hi, I'm analysing some VLBA 22-GHz data (23.8 GHz actually) and I don't have a lot of experience at this frequency. An opacity correction is recommended, but I'm not sure about the resu...
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<div>Hi,</div><div>I'm analysing some VLBA 22-GHz data (23.8 GHz actually) and I don't have a lot of experience at this frequency. An opacity correction is recommended, but I'm not sure about the results. The plots look okay for some antennas, but less so for others. For some, the calculated zenith opacity is basically zero and if I try OPTY='OPAC'(instead of 'GRID') the task crashes as it calculates a negative opacity for FD.</div><div>Any advice would be greatly appreciated. There's only 90 minutes of data and I wonder if that's not helping given the relative small range of sec z for most antennas. Plots of the results (for 'GRID') are attached.</div><div>To be honest, I'm not that bothered about very accurate amplitude calibration so perhaps the quick answer is that I just shouldn't bother, but if this can in fact give decent results, I might as well use them.</div><div>This is on Enterprise Linux 9, by the way. Not that that's probably of much relevance here.</div><div>Thanks,</div><div>Andy</div>
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<strong>Attachments</strong>
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• <a href="https://help.nrao.edu/file.php/9338QGATBAZQGW9337011E70205T/APCAL.PS?access_token=tfemhg-pwqppwrytc-673cd5a27d3782ddfc1371ae96e36175a57546c1" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">APCAL.PS</a> (136.64 KB)
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