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Australia Telescope Compact Array |
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For various reasons, including atmosphere and wrap dependent phase terms, the standard baseline solution determined at 6cm is sometimes not optimal for 3mm, 7mm and 15mm. Unless you can self-calibrate on your source, you will find phase errors resulting from use of the default (6cm) antenna positions, which are especially severe at 3mm. This page lists updates to the baseline solution produced using mm baseline solutions. Lately we've been doing a mm baseline solution straight after the 6cm one, so we are usually able to produce a correction file. This is not usually done though, unless specifically requested. If you'd like to have the mm correction file for a specific configuration, please email Narrabri staff with your request.
Click on the name of the array configuration to see the recommended baseline correction, which can be applied in MIRIAD using atfix dantpos=@file or uvedit dantpos=@file, after saving the link as a text file.
The weather on the evening of 3rd January was poor, and the baseline
solution generated for the 6A array config was not good. Therefore,
another cm baseline solution was generated on the 15th January. To
use this solution, apply the data in a manner similar to that recommended
for the mm solutions. An attempt to generate a mm solution will be made
on either 18th or 20th January.
15-JAN-2008, 6A (better cm solution for 3rd - 14th January)
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