A quieter Sun today 27 January 2023
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A quieter Sun today 27 January 2023
We woke to an absolutely beautiful sunny, calm morning with pleasant temperatures.
Talk about looks can be deceiving! When we set up our new SSM it told a very different story.
The average seeing for the entire session was 3.6 arc seconds with a standard deviation of 1.18
compared to the first day with the SSM (25/1/2023) of an average of 2.2 arc seconds with a SD of 0.74
This was confirmed on seeing the images on the screen of the quieter sun.
While being quieter, there are still eight active regions, all in the northern hemisphere with many small sun spots.
It turned out to be a very interesting and useful session, more playing with the SSM data than getting too many good images.
It looks that this instrument is going to be immensely helpful. This morning we didn't take anywhere near the number of images we normally do as it just wasn't worthwhile. We also used the 72ED for Ha close ups in lieu of the K102. This undoubtedly was a good move and saved the inevitable deleting that would have happened. Even the 72mm was pushing it. The 393nm stopped down to 50mm aperture for a full disk still worked OK but we didn't have what we thought was a suitable mask to stop down the K102 for the 540nm and the data did meet the bit bucket demise. If you work out the ideal aperture for 3.6 arc seconds and 540nm it's <40mm, so if we had just used the 50mm mask it most likely would have worked.
SSM data Full disk 393nm Full disk Ha Ha close ups using 72ED
Talk about looks can be deceiving! When we set up our new SSM it told a very different story.
The average seeing for the entire session was 3.6 arc seconds with a standard deviation of 1.18
compared to the first day with the SSM (25/1/2023) of an average of 2.2 arc seconds with a SD of 0.74
This was confirmed on seeing the images on the screen of the quieter sun.
While being quieter, there are still eight active regions, all in the northern hemisphere with many small sun spots.
It turned out to be a very interesting and useful session, more playing with the SSM data than getting too many good images.
It looks that this instrument is going to be immensely helpful. This morning we didn't take anywhere near the number of images we normally do as it just wasn't worthwhile. We also used the 72ED for Ha close ups in lieu of the K102. This undoubtedly was a good move and saved the inevitable deleting that would have happened. Even the 72mm was pushing it. The 393nm stopped down to 50mm aperture for a full disk still worked OK but we didn't have what we thought was a suitable mask to stop down the K102 for the 540nm and the data did meet the bit bucket demise. If you work out the ideal aperture for 3.6 arc seconds and 540nm it's <40mm, so if we had just used the 50mm mask it most likely would have worked.
SSM data Full disk 393nm Full disk Ha Ha close ups using 72ED
Clare & Peter
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Re: A quieter Sun today 27 January 2023
Looking good, Clare and Peter, in spite of the not so great seeing.
Franco
Franco
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Re: A quieter Sun today 27 January 2023
Thanks Franco
Yes, we still had a very enjoyable session regardless!
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Re: A quieter Sun today 27 January 2023
Boy ole Sol really has quieted down, although some nice proms and another fairly thick filament. Nice session!
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Re: A quieter Sun today 27 January 2023
Thanks Warren
Our weather for the next week looks fairly ordinary, so maybe we won't miss much?
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Re: A quieter Sun today 27 January 2023
Certainly much quieter. I think maybe even smaller and fewer spots than yesterday.
Still 8 regions in the north plus a patch of faculae and faculae in the SE too. There’s not much to them.
Nice work!!
Still 8 regions in the north plus a patch of faculae and faculae in the SE too. There’s not much to them.
Nice work!!
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Re: A quieter Sun today 27 January 2023
Good results under these seeing conditions!
Best regards,
Arne
Best regards,
Arne
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Re: A quieter Sun today 27 January 2023
A really nice set of images, Clare and Peter.
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Re: A quieter Sun today 27 January 2023
Super images but what has happened to the Sun in just one week, fallen asleep? I hope he wakes again soon
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Re: A quieter Sun today 27 January 2023
Yep. The Sun is snoozing I think.
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Re: A quieter Sun today 27 January 2023
Thanks Stu and Alexandra
Perhaps the Sun just needs a little rest
Perhaps the Sun just needs a little rest
Clare & Peter
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Re: A quieter Sun today 27 January 2023
Nice disks there!
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Re: A quieter Sun today 27 January 2023
The SSM tells a story, but these are still lovely images to look at Clare and Peter. Have you looked at the Meteo Blue data at the same time as the SSM to see how that compered on the day?
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Re: A quieter Sun today 27 January 2023
Thanks Peter
Yes we always record both Meteo Blue and Skippy's figures each day along with the actual BOM data. On this day Meteo Blue gave 1.49 arc seconds and the seeing indexes of 4 and 2. Skippy gave 8-9/10 (Aussie pun only, what would a kangaroo know anyway).
So on this occasion it appears that both models gave an optimistic prediction. As frequently seems to be the case with Meteo Blue their own data appears self contradictory as the indexes of 4 and particularly 2 don't seem to equate well with 1.49 arc seconds. We have definitely had it the other way around where the models predicted bad conditions and they were actually very good. We are looking forward to recording the SSM data and comparing it with the modelling over the long term to see if there is any real correlation.
Clare & Peter
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Re: A quieter Sun today 27 January 2023
I also highly recommend the Astrospheric website. They are set up with the astronomer in mind and also do seeing and cloud data.
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Re: A quieter Sun today 27 January 2023
Thanks James.DeepSolar64 wrote: ↑Mon Jan 30, 2023 4:17 pm I also highly recommend the Astrospheric website. They are set up with the astronomer in mind and also do seeing and cloud data.
From their website it appears to be only for North America?
Clare & Peter
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Re: A quieter Sun today 27 January 2023
Hmm. That’s a shame. Meteoblue works here.
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