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Featured Stargazing Solar imaging and techniques

  1. Nov 22, 2017 #76
    Still pretty good and interesting. The previous one was kind of too bright I think. Is that the normal?
     
  2. Nov 22, 2017 #77

    davenn

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    the centre is always going to be brighter than around the limb.
    it's tricky .... bringing up the brightness so the prominences can be seen well and the face is way too bright
    lower the brightness so the face is well exposed and the limb prominences fade away
    this image is a trade off between the 2 extremes
     
  3. Nov 22, 2017 #78
    What's the best time of the day (regular normal day/conditions) to naturally fall in between, if possible?
     
  4. Nov 22, 2017 #79

    davenn

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    when the object of interest is high in the sky ... sun moon, planets, deep space object

    that is when you are viewing/imaging through the least amount of atmosphere, the lower you go towards the horizon, the thicker the layer of
    atmosphere you are viewing through and hence more instability

    the image in post #71 was late in afternoon, around 5:30 - 6pm and the sun was getting pretty low
    hence the quality was not good.
    Today's image was at 430pm still getting a bit low but not as bad, so the stability was much better


    Dave
     
  5. Nov 22, 2017 #80
    Thanks Dave. What you say makes sense.
     
  6. Nov 22, 2017 #81

    davenn

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    @Stavros Kiri

    The next things that is done, and it's next on my list for experiments is.... doing small video clips, 500 frames or so
    then these are stacked in programs like Autostakkert! 2 or Registax, it picks out the best 10 - 20% of the frames and stacks them


    Dave
     
  7. Nov 23, 2017 #82
    That would be neat! I'm looking forward to it.
     
  8. Nov 23, 2017 #83

    davenn

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    The Sun 24 Nov 2017

    trying a B&W version instead of colour .... sort of have the feeling it gives better contrast of the visible structure ?

    171124 Ha.jpg

    A reasonable prominence upper left, a sprinkling of smaller ones elsewhere

    some small filaments here and there but the major feature is the long lasting filament


    Dave

    PS .... Just to clarify ... I didn't image this in B&W ( greyscale) It was imaged in colour and then fully desaturated in Lightroom whilst doing the other processing edits
     
    Last edited: Nov 24, 2017
  9. Dec 9, 2017 #84

    davenn

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    The Sun 10 Dec 2017, 05:10 UT

    Several really nice prominences on the sun today .... was first chance to do imaging in over 2 weeks ....
    Has been a mix of nothing much to image and when there was, it was cloudy for me
    But finally a clear sky and good prom's

    Capture_0001SM.jpg

    During the 30 mins I was observing/imaging, that smaller upper right one disappeared
    and the lower left one, I could see changes as material was falling back towards the sun's limb

    Dave
     
  10. Dec 10, 2017 #85

    davenn

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    full disk image from the 10 Dec

    171210 Cap18sm.jpg
     
  11. Dec 10, 2017 #86
    Are these stacked or just single images?
     
  12. Dec 11, 2017 #87
    this is fantastic
     
  13. Dec 11, 2017 #88

    davenn

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    The Sun in Ha -- 11 Dec 2017
    There were 5 respectable prominences around the limb today

    171211 Ha.jpg
     
  14. Dec 15, 2017 #89

    Andy Resnick

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    You're encouraging me to take out a loan for some solar etalons...
     
  15. Dec 15, 2017 #90

    davenn

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    that's good to hear
    I would welcome more active solar observers :smile:


    I am so wanting to see more people post their solar images in this thread
    White light, Ha etc :)
     
    Last edited: Dec 20, 2017
  16. Dec 16, 2017 #91

    davenn

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    Hi ya,
    Oops, sorry for the slow response. They are all just single shots
     
  17. Dec 16, 2017 #92
    Wow, these are very sharp for single exposures! I imagine if you do start stacking these they will come out very well resolved.
     
  18. Dec 20, 2017 #93

    davenn

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    yes, it would very much improve the result
    Most of the guys that are into doing that do video clips consisting of around 500 to 1500 frames and then use programs that will take the best ~ 20% of those frames and stack them
     
  19. Dec 27, 2017 #94

    davenn

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    2017-12-27 The Sun in Ha ....
    a couple of nice prominences on the sun today ....

    171227 Ha Proms.jpg
     
  20. Dec 27, 2017 #95

    sophiecentaur

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    Good image and convincingly sharp!!
    Not much Sun visible here today.Thick cloud and flurries of rather wet snow, along with rain.
    Time to light the log burner, I think.
     
  21. Dec 27, 2017 #96

    davenn

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    thanks .... it's still sharper visually than when imaged

    been cloudy here for last 4 days. Missed some nice proms 3 days ago
    It doesn't snow here at home It does occasionally do so up on the Blue Mountains ~ 8u0km to the west of Sydney


    Dave
     
  22. Dec 27, 2017 #97

    sophiecentaur

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    Calls fo Unsharp Mask, perhaps?
     
  23. Dec 31, 2017 #98

    davenn

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    possibly, yes ... I'm aware of the process but haven't played with it yet
     
  24. Dec 31, 2017 #99

    davenn

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    2018-01-01 The Sun in Ha ....

    Capture_0003.jpg

    these next two prominences were large but VERY faint ... really had to wind the exposure time up to see them

    Capture_0004.jpg

    Dave
     
  25. Jan 1, 2018 #100
    My first view of the 2018 sun (haven't been out yet) ...

    [and the 100th post! Al right! Yeah! .... ]
     
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