Sunspot group AR 2403 – August 23, 2015

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A new sunspot group on the Sun these days, and a new imaging session for me. After so many days of clouds and rain (it felt like months), I’ve finally got another chance at imaging the Sun. The seeing did not cooperate too much, but for a few brief seconds a clear window allowed for some fantastic views of the new group.

My equipment was the homemade 200mm F/5 Newtonian working at F/20, with a full aperture Astrosolar filter and the ASI 120MM-S camera with a Baader green filter. The seeing conditions were mostly 2-3/10, with the mentioned brief good seeing of 7/10. Only 700 frames were stacked for the images below.

The color version shows the Earth’s diameter also, just as a remainder of how small our planet really is in the Solar System.


ar2403h1335aug23MaxBWOne of the above images was posted by Deborah Byrd on the website. Thank you Deborah!

3 Replies to “Sunspot group AR 2403 – August 23, 2015”

  1. Wow. Really great shots. I love the details! And if you say this was not the best seeing.. I can only imagine how that would look like. And indeed.. such humbling perspective.. our mighty Earth..

    1. Thanks Clau! Yes, the seeing was not as good as I hoped it to be, and since this images were acquired I haven’t had any luck with good seeing at all (for two days now). The Earth is small indeed, luckily we are far enough for medium-sized solar explosions to have little impact on our planet. Let’s hope a large event won’t interact with us any time soon.

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