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Showing results for tags 'flare'.
Found 3 results
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magnificent sunspots with ejections February 7, 2024
andre cassese posted a gallery image in The Sun
From the album: Sun refractor 185 mm Halpha
185 mm apo Askar halpha refractor with Fabry Perot PST modified and optimized prototype© Andre Cassese
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Orbiting the Sun January 16, 2023 ( observatoire rocbaron )
andre cassese posted a gallery image in The Sun
From the album: refractor 150 mm halpha observatoire Rocbaron
The contrast offered by a double stack is addictive, the impression of flying over the solar surface like so many waves above the tumultuous ocean. 150 mm Halpha refractor with double PST etalon and Apollo IMX 429 camera© 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)?
