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Showing results for tags 'Sunspot'.
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Big sunspot in high resolution (Rocbaron observatory) France May 23, 2023
andre cassese posted a gallery image in The Sun
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
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- sunspot
- halpha soleil
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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.
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Solar flare January 9, 2023 refractor 150 mm halpha observatoire Rocbaron (France)
andre cassese posted a gallery image in The Sun
From the album: refractor 150 mm halpha observatoire Rocbaron
Refractor 150 mm apo in Halpha with double standard Fabry Perot PST and camera Apollo IMX 429, Barlow 2.5 x© Andre cassese
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- halpha soleil
- solar flare
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Solar disc of the God Ra in Halpha refractor 80 mm double Fabry Perot PST
andre cassese posted a gallery image in The Sun
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
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- halpha soleil
- halpha andre cassese
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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)?