April Solar Challenge
- Montana
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April Solar Challenge
This month let's look closer at the penumbra and umbra of sunspots in white light (or Calcium II K).
We have to be really careful when imaging the umbra that you don't capture at too low a gamma, or do to much drastic contrast enhancements that you lose the detail in the what you think is black umbra. Remember that the umbra only looks black against the very bright surface of the Sun but it is in fact quite bright and holds a host of interesting features.
Look out for light bridges when the sunspot starts to decay. It can be straight or multi filamented or even twisted like this one
2012 07 11 AR11520 5x by Alexandra Hart, on Flickr
Look out for umbral dots, what look like granulation within the umbra
030514_081727 granulation by Alexandra Hart, on Flickr
Also the penumbra is interesting too. Sometimes you can witness bright penumbral grains which look like mini flares. I spotted these and they only lasted for 5 minutes
180414_075803 AR12037 by Alexandra Hart, on Flickr
If you make animations then you can sometime see running penumbral waves.
Now that the spots are getting larger it is time to look closer at the smaller features and enjoy them, don't dismiss them as just black holes.
Alexandra
We have to be really careful when imaging the umbra that you don't capture at too low a gamma, or do to much drastic contrast enhancements that you lose the detail in the what you think is black umbra. Remember that the umbra only looks black against the very bright surface of the Sun but it is in fact quite bright and holds a host of interesting features.
Look out for light bridges when the sunspot starts to decay. It can be straight or multi filamented or even twisted like this one
2012 07 11 AR11520 5x by Alexandra Hart, on Flickr
Look out for umbral dots, what look like granulation within the umbra
030514_081727 granulation by Alexandra Hart, on Flickr
Also the penumbra is interesting too. Sometimes you can witness bright penumbral grains which look like mini flares. I spotted these and they only lasted for 5 minutes
180414_075803 AR12037 by Alexandra Hart, on Flickr
If you make animations then you can sometime see running penumbral waves.
Now that the spots are getting larger it is time to look closer at the smaller features and enjoy them, don't dismiss them as just black holes.
Alexandra
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Re: April Solar Challenge
Alexandra,
Sunspots I can do since they make interesting and detailed visual targets. At 62.5x using my Celestron 102 today I noticed two light bridges intruding in upon the umbra from the SSW in the large spot of AR12978. SDO captured them in this HD image.
James
Sunspots I can do since they make interesting and detailed visual targets. At 62.5x using my Celestron 102 today I noticed two light bridges intruding in upon the umbra from the SSW in the large spot of AR12978. SDO captured them in this HD image.
James
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Re: April Solar Challenge
AR 2978 2981
150/1200 refractor, continuum/wedge, 2x barlow and zwo 290
Processed to show umbral dots false color
4-3-22 AR 2978 2981 color by Torsinadoc, on Flickr
150/1200 refractor, continuum/wedge, 2x barlow and zwo 290
Processed to show umbral dots false color
4-3-22 AR 2978 2981 color by Torsinadoc, on Flickr
Last edited by torsinadoc on Sat Apr 16, 2022 7:02 pm, edited 3 times in total.
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Re: April Solar Challenge
I do believe you out resolve the SDO image by a bit and certainly “ see “ those bridges a bit better than I could visually. They look more like “ light docks “ than “ light bridges “!!
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Re: April Solar Challenge
2975-76 on 30th of march, but the sun was quite low here in Quebec, Canada.
I used the new Istar Phantom 140mm, Baader ceramic, continuum and 0,9 density, ASI 290.
I used the new Istar Phantom 140mm, Baader ceramic, continuum and 0,9 density, ASI 290.
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Re: April Solar Challenge
Alexandra,
concerning light bridges, sometimes I've seen interesting events right there, bright spots like Ellerman bombs lasting for couple of minutes only. Last month I catched participation of the light bridge in C-class flare. It was curious when flaring started simultaneously near both poles of the AR dipole and the brightest in its center part.
I made a small animation of the flare, despite a seeing in CaK is awful usually.
regards
Leo
concerning light bridges, sometimes I've seen interesting events right there, bright spots like Ellerman bombs lasting for couple of minutes only. Last month I catched participation of the light bridge in C-class flare. It was curious when flaring started simultaneously near both poles of the AR dipole and the brightest in its center part.
I made a small animation of the flare, despite a seeing in CaK is awful usually.
regards
Leo
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- CaK
- Sun 20220315-0603_1 p2AIO.jpg (586.37 KiB) Viewed 1982 times
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- C-flare
- Sun 20220315 0555UTC CaK flare animation 60.gif (4.78 MiB) Viewed 1982 times
- DeepSolar64
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Re: April Solar Challenge
WoW, a nice flare in CaK. I don’t see a lot of those here. And a nice CaK light bridge too.
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Re: April Solar Challenge
Very nice Leo!
http://brierleyhillsolar.blogspot.co.uk/
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Re: April Solar Challenge
Oh WOW!!! that is the most amazing flare animation, superb!! nice work Leo
Alexandra
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Re: April Solar Challenge
Love the animation: I've never seen an animated flare in CaK before!
Thank you
Nic
Thank you
Nic
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Re: April Solar Challenge
Here's my contribution using a WL (430 nm) image of active regions 12993 and 12994 captured on April 18th 2022
20220418_430_AR2993_2994_x5_Mono by Stuart Green, on Flickr
It looks like light bridges might be forming in the central and right hand (westerly) sunspots and it will be interesting to see how these change over the coming days.
Stu.
20220418_430_AR2993_2994_x5_Mono by Stuart Green, on Flickr
It looks like light bridges might be forming in the central and right hand (westerly) sunspots and it will be interesting to see how these change over the coming days.
Stu.
H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
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More images at http://www.flickr.com/photos/solarcarbon60/
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Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: April Solar Challenge
Awesome image Stu! That area is still showing a lot of activity in the short UV wavelengths seen by the SDO spacecraft. Your 430nm image shows why.
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Re: April Solar Challenge
This is fab Stuart, of course when we started April we had loads of mega spots and as soon as I posted this they all disappeared. At least we have a good target for last couple of weeks
Alexandra
Alexandra
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Re: April Solar Challenge
Great shots on all the posts!
Warren
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Re: April Solar Challenge
Light bridge in the NW spot seen visually. The umbra looks like a broken heart!! And look at the complex scattered umbrae in the SE spot! And there's a new one coming in behind it.
My report for today goes into a little more detail.
My report for today goes into a little more detail.
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Re: April Solar Challenge
Next day, next turn. Nice developing AR's 2993 2994 with light bridges in CaK, but not enough air quality to see the granulation well.
regards
Leo
regards
Leo
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Re: April Solar Challenge
It still looks nice, Leo.
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Re: April Solar Challenge
I'm seizing the opportunity to join in with April's challenge and a personal best for me in WL!
Excitedly,
Nic
NS 20220419 0955 WL 2993 2994 2995 by Nic Spencer, on Flickr
Excitedly,
Nic
NS 20220419 0955 WL 2993 2994 2995 by Nic Spencer, on Flickr
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Re: April Solar Challenge
Looks awesome, Nic!!
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Re: April Solar Challenge
That's amazing Nic, loads of umbral detail and light bridges certainly they are not black holes!
Alexandra
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Re: April Solar Challenge
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Re: April Solar Challenge
Wow!! these are fantastic
It was painful yesterday to see lovely sunshine and be at work
Alexandra
It was painful yesterday to see lovely sunshine and be at work
Alexandra
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Re: April Solar Challenge
Very nice work, Mark!!
Lunt 8x32 SUNoculars
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Re: April Solar Challenge
Great, very well balanced image!
I took the liberty... sorry, Mark, I have to geek out.
what do you think?
I took the liberty... sorry, Mark, I have to geek out.
what do you think?
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Re: April Solar Challenge
H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: April Solar Challenge
Beautiful work Stu!!
Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
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Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
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Re: April Solar Challenge
Montana wrote: ↑Sat Apr 02, 2022 5:52 pm This month let's look closer at the penumbra and umbra of sunspots in white light (or Calcium II K).
We have to be really careful when imaging the umbra that you don't capture at too low a gamma, or do to much drastic contrast enhancements that you lose the detail in the what you think is black umbra. Remember that the umbra only looks black against the very bright surface of the Sun but it is in fact quite bright and holds a host of interesting features.
Alexandra
Hi Alexandra,
This is my biggest gripe with NASA/SDO.
I check the SDO/HMI Quick-Look Continuum page every morning (as do many others I suspect) just to see what's appeared
overnight and awaits capture.
The resolution is superb as you'd expect from a 4096x4096 sensor and the location , but the people/person processing the data always has the black-point shoved up way too close in my opinion and it destroys any hope of making out any detail in the umbra and exaggerates the limb darkening to such an extent that any brand new arrivals (or departing regions) get lost in the dark earlier than is necessary.
https://sdo.gsfc.nasa.gov/assets/img/la ... 6_HMII.jpg
I am as careful as I can be when playing with my meagre data to not kill of any umbral details my humble set-up may have captured .
I e-mailed them regarding this many moons ago but sadly got no response.
Regards ,
Steve.
Steve.
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Re: April Solar Challenge
Steve,steveward53 wrote: ↑Sat Sep 03, 2022 5:16 amMontana wrote: ↑Sat Apr 02, 2022 5:52 pm This month let's look closer at the penumbra and umbra of sunspots in white light (or Calcium II K).
We have to be really careful when imaging the umbra that you don't capture at too low a gamma, or do to much drastic contrast enhancements that you lose the detail in the what you think is black umbra. Remember that the umbra only looks black against the very bright surface of the Sun but it is in fact quite bright and holds a host of interesting features.
Alexandra
Hi Alexandra,
This is my biggest gripe with NASA/SDO.
I check the SDO/HMI Quick-Look Continuum page every morning (as do many others I suspect) just to see what's appeared
overnight and awaits capture.
The resolution is superb as you'd expect from a 4096x4096 sensor and the location , but the people/person processing the data always has the black-point shoved up way too close in my opinion and it destroys any hope of making out any detail in the umbra and exaggerates the limb darkening to such an extent that any brand new arrivals (or departing regions) get lost in the dark earlier than is necessary.
https://sdo.gsfc.nasa.gov/assets/img/la ... 6_HMII.jpg
I am as careful as I can be when playing with my meagre data to not kill of any umbral details my humble set-up may have captured .
I e-mailed them regarding this many moons ago but sadly got no response.
Regards ,
Steve.
Try this site. https://suntoday.lmsal.com/suntoday/?su ... 2022-09-03 These images show more balanced detail than many. I really like their 4K white light images. They look even better if you sharpen them just a little in GIMP, PhotoShop etc.
The images appear quite natural and there is no exaggerated limb darkening. Umbral and penumbral detail is decent too.
James
I use this site a lot too.
https://www.thesuntoday.org/sun/current-observations/
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Re: April Solar Challenge
"Steve,
Try this site. https://suntoday.lmsal.com/suntoday/?su ... 2022-09-03 These images show more balanced detail than many. I really like their 4K white light images. They look even better if you sharpen them just a little in GIMP, PhotoShop etc.
The images appear quite natural and there is no exaggerated limb darkening. Umbral and penumbral detail is decent too.
James"
SDOHMIc_Greyscale4K_9-2-22.jpg
Thank you James ,
Seems silly that an outside party has to reprocess the data "properly" , but I suppose if I'm the only person who's complained then NASA has better things to worry about right now.
Try this site. https://suntoday.lmsal.com/suntoday/?su ... 2022-09-03 These images show more balanced detail than many. I really like their 4K white light images. They look even better if you sharpen them just a little in GIMP, PhotoShop etc.
The images appear quite natural and there is no exaggerated limb darkening. Umbral and penumbral detail is decent too.
James"
SDOHMIc_Greyscale4K_9-2-22.jpg
Thank you James ,
Seems silly that an outside party has to reprocess the data "properly" , but I suppose if I'm the only person who's complained then NASA has better things to worry about right now.
Steve.
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Re: April Solar Challenge
Steve,
I agree with you. They should be processed properly. I use these images as observational guides at the scope with a computer set up or on my smartphone. I look at what is there and try to see it in the scope. So the image needs to be accurate. I use the NSO GONG Ha images in the same way.
And you are welcome.
James
I agree with you. They should be processed properly. I use these images as observational guides at the scope with a computer set up or on my smartphone. I look at what is there and try to see it in the scope. So the image needs to be accurate. I use the NSO GONG Ha images in the same way.
And you are welcome.
James
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Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
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Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
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Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
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Re: April Solar Challenge
I know only too well how tricky it can be to try and get some sort of consistency in images on a day to day basis .DeepSolar64 wrote: ↑Sat Sep 03, 2022 6:08 am Steve,
I agree with you. They should be processed properly. I use these images as observational guides at the scope with a computer set up or on my smartphone. I look at what is there and try to see it in the scope. So the image needs to be accurate. I use the NSO GONG Ha images in the same way.
And you are welcome.
James
But the folks at NASA/SDO don't have to contend with seeing issues , contrails , haze , clouds , smoke , Saharan dust .... etc etc ...
I assume it's just been set-up and runs automatically , I will try contacting them again though just to remind them ...
Anyway , must dash , time for a big mug of coffee and get set up , Sun will be appearing in 30 minutes and I've got a new camera to aim at it ...
Steve.
Day by day Solar album ... http://www.astrobin.com/users/steveward53/
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Re: April Solar Challenge
Good luck Steve. I have been under mostly cloudy skies and have gotten only a quick 8x32 solar binocular view.
Lunt 8x32 SUNoculars
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "
Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
Visual Observer
" Way more fun to see it! "