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Solar activity

Sunspot regions, coronal holes, filaments? In this forum we discuss everything related to the activity on our nearest star.

Solar activity forum rules - Let's keep things tidy!

1. Want to talk about a sunspot region? Feel free to make a topic! Keep the title clean and simple! For example: Sunspot region 1234, or AR1234.
2. Want to discuss a solar flare? Do not make a new topic! Post in the existing topic for that sunspot region or make a new topic if the sunspot region in question does not have a topic yet!
3. Solar flares and sunspot regions on the east limb that are not numbered yet are discussed in this topic.
4. Returning active region? Make a new topic with the current sunspot region number. Do not revive the old topic for that sunspot region!
5. Want to talk about coronal holes? There is a dedicated topic for that. Do not post a new topic.
6. Want to talk about filaments? There is a dedicated topic for that. Do not post a new topic.
7. Discussions about possible earth-directed coronal mass ejections and the geomagnetic storm that it might cause go in the geomagnetic activity forum.

857 topics in this forum

  1. 28-29 Jul S2 radiation storm

    By tniickck,
    • 14 replies
    • 1.9k views

  2. AR 13376 1 2

    By Philalethes,
    • 28 replies
    • 2.2k views

  3. Gauss of the spots

    By Maurizio Marsigli,
    • 3 replies
    • 694 views

  4. Question about Type II Radio Emissions 1 2

    By KW2P,
    • 33 replies
    • 3.7k views

  5. AR 13372: M5, M6, and more! 1 2 3

    By tniickck,
    • 52 replies
    • 6k views

  6. AR 3373

    By tniickck,
    • 6 replies
    • 837 views

  7. bright outflows on coronagrams

    By Philalethes,
    • 21 replies
    • 1.6k views

  8. AR 13363 1 2 3 4 5

    By tniickck,
    • 124 replies
    • 8.7k views

  9. AR 3354 1 2 3 4 6

    By Jesterface23,
    • 146 replies
    • 17.2k views

  10. Solar Physics

    By Patrick P.A. Geryl,
    • 0 replies
    • 368 views

  11. AR3361

    By CapeCodShade,
    • 6 replies
    • 930 views

  12. AR3363

    By Sotiris Konstantis,
    • 8 replies
    • 800 views

  13. AR 3367

    By tniickck,
    • 0 replies
    • 319 views

  14. AR 13366

    By CapeCodShade,
    • 4 replies
    • 484 views

  15. What Causes certain sunspots to rapidly evolve?

    By Reesepuff,
    • 2 replies
    • 738 views

  16. AR 13359

    By cgrant26,
    • 12 replies
    • 1.2k views

  17. Difference ISN vs 10.7 Solar Flux vs High Resolution SN 1 2 3

    By Patrick P.A. Geryl,
    • 66 replies
    • 5.8k views

  18. AR 13348

    By Philalethes,
    • 0 replies
    • 418 views

  19. AR 13340

    By Drax Spacex,
    • 3 replies
    • 564 views

  20. Record amount of small sunspots?

    By Patrick P.A. Geryl,
    • 17 replies
    • 1.6k views

  21. AR3333

    By Drax Spacex,   
    • 13 replies
    • 1.6k views

  22. AR 13341 1 2

    By Philalethes,
    • 45 replies
    • 3.5k views

  23. Reading Magentogram and HMIBC Images

    By ThisIsJohnnyT,
    • 9 replies
    • 953 views

  24. AR 13335 & AR 13336

    By Philalethes,
    • 13 replies
    • 1.3k views

  25. AR 13327

    By cgrant26,
    • 7 replies
    • 846 views
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