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Found 3 results

  1. 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

  2. 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)?
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