MeerKAT data sets that feature the Sun #2
Replies: 9 comments 4 replies
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On Nash: This is a 4-hour L-band MIGHTEE observation, also in the CDFS field. Solar interference can be seen in this movie made from 8-second snapshot images for one of the scans. Here are the properties of the observation: and the Sun/Moon information: |
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I want to ask about this observation we are supposed to work with regarding imaging the sun:
When I image the CORRECTED_DATA I get this:
The coordinates match Field 0 of the primary calibrator. Are you sure you have given the correct MS for the target? |
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Field 0 is the primary calibrator :) The MS contains all the calibrators and is uncalibrated, I figured calibration and subtraction of the field was part of the process. But I can provide a calibrated MS and a model if you like. |
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Greetings prof. @IanHeywood I already succeeded to do the primary calibrate in the MS. |
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Apologies for the misunderstanding. I am uploading the calibrated MS now and will let you know when I'm done. Sorry for the slow replies I'm away this week. |
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Oky Prof. Waiting for your reply.
Cheers
Victoria
…On Thu, Jul 14, 2022 at 6:05 PM IanHeywood ***@***.***> wrote:
Apologies for the misunderstanding. I am uploading the calibrated MS now
and will let you know when I'm done. Sorry for the slow replies I'm away
this week.
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Hi @Victoria-Samboco, I have uploaded the self-calibrated Measurement Set to nash here: I think the MODEL_DATA column contains a model at present, but I have also uploaded the model images just in case. It might be worth duplicating the MS and leaving the original at that location. This observations hasn't been calibrated with Caracal but I don't think that will make a difference for your solar imaging workflow. Please let me know if you encounter any issues or have any questions. |
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Okay, I will do it, Thank you. For any issues I will let you know
Victoria
…On Thu, 14 Jul 2022, 22:03 IanHeywood, ***@***.***> wrote:
Hi @Victoria-Samboco <https://github.com/Victoria-Samboco>, I have
uploaded the self-calibrated Measurement Set to nash here:
/home/ianh/solarkat/1645272078_calibrated
I *think* the MODEL_DATA column contains a model at present, but I have
also uploaded the model images just in case. It might be worth duplicating
the MS and leaving the original at that location. This observations hasn't
been calibrated with Caracal but I don't think that will make a difference
for your solar imaging workflow.
Please let me know if you encounter any issues or have any questions.
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On nash: This is a 15 minute observation from the ThunderKAT project. The Sun is about 8 degrees north of the field. I think this is an excellent data set with which you can investigate the 'mitigation' aspect of your project, as the Sun has a definite negative impact on the target data. It seems this is mainly due to the strong sunspots, and thus a simple u,v cut probably won't fix it (although don't take my word for it!). The observation is also short, so the quick turnaround time for making images will lend itself to rapid experimentation. The Measurement Set above has 1GC calibrated data in the An additional 'feature' of this observation is that the Sagittarius A complex is detected through the sidelobes about 2.5 degrees NNE from the field centre, so the image size will have to be large enough to deconvolve and model that. Furthermore, the sunspots can be alised into the target field, and so care will have to be taken to avoid these being deconvolved and entering the selfcal model. Possible options there include manual construction of the deconvolution mask, and experimenting with the image size / cell size / padding parameters of the imager. In short, this observation is problematic in several ways, but I think in terms of the goals of your project that is a good thing! :) |
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@IanHeywood, I'm having an issue with permission coping this dataset. |
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Hi @Victoria-Samboco, can you try now please? |
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Now its okay, thanks. |
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On Nash:
This is a LADUMA UHF observation. Here are the properties of the observation:
and here are the Sun / Moon positions in relation to the scans:
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