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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.

863 topics in this forum

  1. Odd of a huge flare

    By Mckinnon,
    • 6 replies
    • 956 views

  2. would this spot be a beta-delta?

    By farm24,
    • 2 replies
    • 399 views

  3. what is this on the LASCO images?

    By farm24,
    • 9 replies
    • 562 views

  4. What is this SDO image?

    By farm24,
    • 6 replies
    • 387 views

  5. Is this a solar flare?

    By Solarflaretracker200,
    • 4 replies
    • 601 views

  6. CME 2021-11-24 14:00 SE Quadrant

    By Drax Spacex,
    • 3 replies
    • 627 views

  7. What would "tight" magnetic field lines look like?

    By Christopher S.,
    • 1 reply
    • 453 views

  8. What is the highest hemispheric value you have seen on this app/website?

    By Solarflaretracker200,
    • 7 replies
    • 645 views

  9. Are we in solar maximin or minimum?

    By Solarflaretracker200,
    • 3 replies
    • 571 views

  10. Solar Flare Event Catalog

    By ropunch04,
    • 1 reply
    • 479 views

  11. Why is there an h-alpha plage from 2002 listed

    By farm24,
    • 20 replies
    • 691 views

  12. How to correspond to SHARP fits file and Solar Region Summary file?

    By Jack Yang,
    • 1 reply
    • 369 views

  13. when will we be able to start getting the solar orbiter images

    By farm24,
    • 4 replies
    • 921 views

  14. 2981 on SDO - What exactly am I looking at here

    By Christopher S.,
    • 20 replies
    • 884 views

  15. What are these darker patches near the limb?

    By jeny96,
    • 4 replies
    • 504 views

  16. How to determine the type of a solar region/spot?

    By Space pro,
    • 1 reply
    • 403 views

  17. When can you call an Event "Long Duration" ?

    By MinYoongi,
    • 4 replies
    • 712 views

  18. this looks like a very active spot coming onto the disk looking at this flare and CME it launched

    By farm24,
    • 19 replies
    • 1.1k views

  19. Is AR2891 active? 1 2 3 4 6

    By Sam Warfel,   
    • 137 replies
    • 7.6k views

  20. CH HSS from a northern crown extension

    By Drax Spacex,   
    • 4 replies
    • 444 views

  21. Electrostatics of suns corona and outside influences

    By solar investigator,
    • 1 reply
    • 344 views

  22. AR2887 X flare and CME 1 2 3 4 12

    By Drax Spacex,   
    • 280 replies
    • 29.7k views

  23. Has something like this happened before

    By No pseudoscience,
    • 3 replies
    • 592 views

  24. Solar cycle 25

    By solar investigator,
    • 6 replies
    • 975 views

  25. Ap & aa Indices and Solar Minimum 1 2 3

    By theartist,
    • 63 replies
    • 14.5k views
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