Solar imaging and techniques

  • #1
davenn
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Main Question or Discussion Point

Hi everyone

This thread is for showing your images of solar activity taken with YOUR cameras, telescopes etc.
That is, don't post images from SDO, SOHO or any other professional sources unless you specifically want to ask "how do they do that and what are those solar features I can see?

This is intended for those of you out there, like myself that get out there and do your own imaging and are looking for ways to improve your techniques and general discussion of ideas or just to share your images.

There wont always be times when there is anything worth imaging on the sun. For me, there often can be many weeks between images. But it will be interesting to follow the Sun as it reaches solar minimum and then see the spot count rise as the next maximum approaches.

I will start of by reposting some recent images I had in other spread out threads. It will be good to have them all under one banner

cheers
Dave
 
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  • #2
davenn
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9 July 2017

AR2665 ... largest spot group for some time
Canon 6D, 800mm, f11, 125th, ISO100 ( the 800mm is a 100-400mm L lens with a x2 teleconverter)
With my eyesight going downhill, I have really been struggling of late to be able to get sharp manual focus
1f641-png.png


img_0914sm-jpg.jpg


Dave
 

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  • #3
davenn
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22 August 2017

there are currently 2 significant spot groups visible traversing the face of the solar disk

The centre-left string is active region 2671 and the region near the right edge ( eastern limb) is
active region 2672. AR2672 will continue to rotate across the disk across the next 2 weeks.

800mm, f9, 200th sec, ISO200 and Orion solar filter

img_0933sm-gif.gif


Dave
 
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  • #4
davenn
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2 September 2017

A quick shot of the sun this morning
Nth lower left, East limb lower right

400mm telephoto = x2 teleconverter, 500th sec, f11

img_0941-jpg.jpg


Dave
 
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  • #5
davenn
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4 September 2017

The large group continues across the sun
there has been new spots appear to the east of this long string of spots plus a new set coming around the east limb

400mm telephoto = x2 teleconverter, 500th sec, f11
rotation is from lower right to upper left ( as seen through my camera)
You can also see the smaller single spot up from the large spot chain has also evolved into a much more complex structure over the last 24 - 48 hrs

img_0946sm-jpg.jpg


Dave
 
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  • #6
davenn
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5 September 2017
The Sun

400mm telephoto = x2 teleconverter, 500th sec, f11
rotation is from upper right to lower left ( as seen through my camera)

The upper group continues to grow in size and complexity and it is also becoming more active

img_0947sm-jpg.jpg


Dave
 
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  • #7
davenn
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6 September 2017

2 large spot groups continue to dominate the solar disk

img_0953-jpg.jpg


Dave
 
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  • #8
davenn
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16 September 2017

a single spot group is currently visible
but I did capture some bright faculae near the limb in the upper right of the image

This is with my new solar filter film from Baader

170916 sunspots and plague.jpg


Dave
 
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  • #9
davenn
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This is the new filter film I am using ....

http://www.ozscopes.com.au/baader-astrosolar-safety-film-large-100cm-x-50cm.html

I have been concerned about the focus quality of the Orion filter which is a surface deposited film on a glass carrier
( similar process aluminiumising of glass for making reflector telescopes).
My concerns are centred around having the additional layer of glass in front of the camera lens system and how it
is affecting the quality of the light passing through it.

I purchased this larger sheet, it will be enough to make a number of filters for different camera lenses and for the telescope
It's going to be interesting to see if there are any significant differences between the glass filter and the film filter

cheers
Dave
 
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  • #10
davenn
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18 September 2017

Still just a single spot group is currently visible
plus some bright faculae near the limb in the upper right of the image

IMG_0973sm.jpg


Dave
 
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  • #11
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Thanks Dave for the great photos (and the thread). With an interesting solar activity it's good to have some real first-hand photos!

Other than being kind of a 'cell phone "maniac" ' , I am not too much into photography myself, but I will be doing my observations and perhaps confirm them here occasionally with your (and other people's) photos.

From your older threads, there is also:
https://www.physicsforums.com/threads/a-little-solar-activity-this-week.829420/

(I particularly like that photo + you mention there how disappointing that solar maximum has been ... [acting weird now that we're heading towards minimum])

Here is a diagram study of the solar cycle:
https://www.spaceweatherlive.com/en/solar-activity/solar-cycle
(shows the Solar Cycle progression ...)
 
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  • #12
davenn
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Thanks Dave for the great photos (and the thread). With an interesting solar activity it's good to have some real first-hand photos!
cheers :smile:

just hope we can encourage any of our resident astrophotographers to add to the thread


D
 
  • #13
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just hope we can encourage any of our resident astrophotographers to add to the thread
I hope so too. May be you can post the link in the two recent threads for the eclipse (eclipse ... + eclipse photos threads). There were quite a few ambitious astrophotographers there. If we like the eclipse (hidden sun) we ought to like the full sun too ...
 
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  • #14
I took this one about a year ago. Not too much happening here but I think the image came out well.
12419222_172710923116402_3342029625079670337_o.jpg
 
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  • #15
Andy Resnick
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cheers :smile:

just hope we can encourage any of our resident astrophotographers to add to the thread


D
What is this so-called 'sun' of which you speak? :)
 
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  • #16
davenn
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What is this so-called 'sun' of which you speak? :)
Hey Andy

I assume from that comment, you have been getting a lot of cloudy days :frown:

was hoping you would pop into the thread. Not sure of you do any solar imaging ? sunspots etc
If you do, please add to thread so we can keep a good running view of the sun and its activity as time goes by


Dave
 
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  • #17
davenn
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I took this one about a year ago. Not too much happening here but I think the image came out well.
good shot, thanks for sharing and I hope to see more :smile:

what solar scope/filter system are you using ?



Dave
 
  • #18
Andy Resnick
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Hey Andy

I assume from that comment, you have been getting a lot of cloudy days :frown:

was hoping you would pop into the thread. Not sure of you do any solar imaging ? sunspots etc
If you do, please add to thread so we can keep a good running view of the su8n and its activity as time goes by


Dave
I do intend to contribute! Good idea on the thread. I have some excess spectral filters lying around I want to try out- the set of times I am available and the set of times the sun is available has so far been disjoint.
 
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  • #19
good shot, thanks for sharing and I hope to see more :smile:

what solar scope/filter system are you using ?



Dave
Thanks!

The scope is a Takahashi 90mm with a Coronado Ha filter. The image was taken with an ASI120. The image was created using lucky imaging and wavelet filtering.
 
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  • #20
Drakkith
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Dang, I wish I had the filters necessary to do some solar imaging. Perhaps one day... :cry:
Great images by the way!
 
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  • #21
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This looks like a fun sport. Any good links on how to get started, what camera/lens/filter/etc is needed? What kind of exposure times are used for these shots? Can you just use a tripod or is tracking required? Thanks
 
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  • #22
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What is this so-called 'sun' of which you speak? :)
It's a star! ... I only see one everyday (daytime) ! ...
 
  • #23
This looks like a fun sport. Any good links on how to get started, what camera/lens/filter/etc is needed? What kind of exposure times are used for these shots? Can you just use a tripod or is tracking required? Thanks
I started by just googling solar imaging. There are a lot of recipes for imaging and one isn't necessarily better than the other, its more a matter of taste.

Here are some general guidelines:
-Use a white-light filter (cheap and can see sunspots) or a Ha filter (expensive but shows solar flares and sunspots in excellent detail)
-Use a good quality telescope (A large aperture will give better resolution but larger filters are harder to find and more expensive, the best compromise is probably a nice 3" refactor)
-Use very short exposures (the Sun is obviously very bright so it doesn't take much time to collect enough light to expose the image)
-Tracking is less important (Since the exposure time is so short, tracking is not an issue; any tripod will do)
-Take lots of images (Since the exposures are quick, you can take a lot of them and use software to select the best images to stack together. This is called "lucky imaging" and is pretty standard for solar system imaging)
 
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  • #24
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Dang, I wish I had the filters necessary to do some solar imaging. Perhaps one day... :cry:
Great images by the way!
Dave's link in #9 looks like a winner. :smile:
 
  • #25
jim mcnamara
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@NFuller - could you expand a bit on 'lucky imaging' ? I'm guessing you are processing multiple images into one, i.e., photoshop, and trying increase color contrast?
 

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