9 replies to this topic

[gstrumol]

Rain is imminent here now, but in the morning the sun was out and it was above freezing! So out went the scopes on the balcony for some quick imaging.

 

Now one could describe the sun lately as a white circle drawn on a black background (actually, that was me  ) But if you look hard enough, and in the right wavelengths, there is a lot to see, starting with Ha and the PST (digital enlargement of the disk on the left):

 

(click to enlarge)

 

I guess it's the Eastern side to get the proms this time.

 

In basic (broadband) WL, you could be forgiven for looking at the sun and saying "where did all the spots go?" And indeed, for some you'll need a magnifying glass to find them. Even the faculae are hard to spot. But not near the 393nm wavelength. Here is a comparison of WL using the Baader film and the Antlia 393nm wedge:

 

(click to enlarge)

 

I've included the SDO AIA 1700 A image to compare the faculae across the disk.

 

Still, the sunspot groups look so tiny, one has to zoom in to see any detail. Here are some zoomed-in images of the groups with the AT80EDL, Baader film, and the double 2X Barlow assembly:

 

(click to enlarge)

 

Not so boring now, huh? 

[Jim Waters]

Nice images gstrumol.

[groom]

So for the solar minimum expected in several years, will there still be plenty of activity to be seen in H-alpha or calcium-k light? Is that what happened during the most recent solar cycle minimum?

[gstrumol]

Nice images gstrumol.

Thanks Jim!

 

 

So for the solar minimum expected in several years, will there still be plenty of activity to be seen in H-alpha or calcium-k light? Is that what happened during the most recent solar cycle minimum?

I believe and certainly hope so, Peter!

[spicerack0]

noice job-

 

I am still sitting under endless clouds impatiently awaiting the firstlight of my coronagraph    Looks like i wont even get a clear day till mid april at this point and I may have to bring it to work with me just to get 5 minutes in lol   (been battered by nonstop highwinds for a couple weeks now)

Edited by spicerack0, 27 March 2025 - 04:37 PM.

[gstrumol]

noice job-

 

I am still sitting under endless clouds impatiently awaiting the firstlight of my coronagraph    Looks like i wont even get a clear day till mid april at this point and I may have to bring it to work with me just to get 5 minutes in lol   (been battered by nonstop highwinds for a couple weeks now)

I hear you. I'm still waiting for a cloudless day with no winds!  

[rigel123]

Nice one Gary!  Tried for animation of that eastern limb this morning but the clouds had other plans!  I did get some shots though and will post tomorrow.

[gstrumol]

Nice one Gary!  Tried for animation of that eastern limb this morning but the clouds had other plans!  I did get some shots though and will post tomorrow.

Thanks Warren!

 

Looking forward to them (as you know, I like my silly comparison shots)

[Foc]

Good results, particularly with the Antlia 393 wedge which as you say...adds a lot more detail. And I image if you watched the sunspot groups over a few hours the tiny umbra show change. Ha disc details very obvious.

 

Still going through my own results for 27 March, my Ha disc look pretty mundane so far with little contrast (ie likely tuned too far for even disc illumination rather than for disc detail) and no fish shaped proms! but we only have clouds and rain to look forward to here for some days.

[gstrumol]

Good results, particularly with the Antlia 393 wedge which as you say...adds a lot more detail. And I image if you watched the sunspot groups over a few hours the tiny umbra show change. Ha disc details very obvious.

 

Still going through my own results for 27 March, my Ha disc look pretty mundane so far with little contrast (ie likely tuned too far for even disc illumination rather than for disc detail) and no fish shaped proms! but we only have clouds and rain to look forward to here for some days.

Thanks Foc!

 

Yes, it's fun to watch the evolution of the spots from one day to the next (assuming you have a good string of clear skies  ). Here was such a compilation I did last October (with different scopes and filters):

 

(click to enlarge)

 

Same here - rain for the next few days