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Found 9 results

  1. How often do C-Class or higher flares originate from plage-only areas on the visible solar disk with no AR (no sunspots)? Qualitatively, the answer is not often, but what is the quantitative answer, historically speaking? For all C-class or higher flares, what percent occurred in plage-only areas on the solar disk (i.e. not including flares along the limb or slightly behind the limb where existence or nonexistence of sunspots cannot be determined)?
  2. This sunspot looks interesting, Does it have a delta?
  3. From the album: refractor 150 mm halpha observatoire Rocbaron

    At the heart of the great plasma tornado 150 mm apo halpha refractor - Double stack Fabry Perrot PST coronado optimized - Barlow 2.5 x and Apollo IMX 429 camera

    © Andre cassese

  4. Edit: Peaked at M2.42 after this image. Here is a self-updating view for visual aid:
  5. I would like to talk about interesting sunspots of the past. We can start off with region 12673 since it formed and grew rapidly, possibly during a solar minimum. More than half of the top 50 solar flares in 2017 occurred in region 12673, and is the reason for the strongest geomagnetic storm of SC24 [KP8]. For me, this is quite an unusual sunspot, because of its occurrence in late 2017, which might be a year in solar minimum. This sunspot could be comparable to region 10930 in December 2006, but that could be in an another topic of its own.
  6. From the album: Soleil Halpha lunette 120 mm et 80 mm

    Solar disc of the God Ra in Halpha refractor 80 mm F/D 6.3 - double Fabry Perot PST 29 December 2022 Camera Apollo IMX 429 player one - Observatory of Robaron (France)

    © Andre cassese

  7. Ahmed

    Sunspots 08 oct 22

    From the album: Oct 2022

    Sunspots 3112, 3116,3119,3120 and 3118
  8. Ahmed

    Sunspots 08 oct 22

    From the album: Oct 2022

    Sunspots 3112, 3116,3119,3120 and 3118
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