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Found 5 results

  1. From the album: Sun refractor 185 mm Halpha

    A magnificent solar flare this May 13, 2024 with my 185mm apo Askar scope with Fabry Perot PST Coronado optimized Halpha Barlow 2.5 x and Camera player one

    © 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)?
  3. On Monday, May 6, an X4.5 class flare was seen in the Sun. I was photographing The Sun at the observatory of Tampereen Ursa just then. Cloudiness disturbed the observations somewhat, but in the end I was able to create a video just when the flare was at its strongest. I stacked this image from this video. This was the first time for me that I could observe (live) such a powerful flare. The smaller ones are stuck in the camera's memory.

    © Kari A. Kuure

  4. 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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