Recently the Sun as featured a small group of sunspots belonging to the new Solar cycle 25, indicating a new growing cycle of its activity. The image captured from my backyard last April 19th, 2020 with a Solar Ha telescope – at the wavelength of Hydrogen-Alpha – reveals an apparently calm surface, devoid of sunspots. However, thanks to an exceptional seeing (very good atmospheric stability) it was possible to register the granulated surface of the Sun in great detail. These granules, as well as sunspots, appear in a layer we call the Photosphere (sphere of light). Being from this same surface that emerges all the light we visually see, leaving our star, it is involved in the Chromosphere (sphere of color), which is the place where we can observe gas filaments and solar Protuberances, or Prominences, where Solar Flares do occur. With a diameter of 1,392,000 km, our Sun is composed of 73% Hydrogen, 25% Helium and 2% from heavier elements. The image thus reveals a large prominence visible on the left side of the disc (imagining a clock, it would be where it marks 9h) and other small prominences spread around the solar limb, in the Chromosphere.
https://www.miguelclaro.com/wp/portfolio/the-sun-surface-revealed-in-hydrogen-alpha/
Technical details | Detalhes Técnicos LUNT LS100T Ha | AZ-HEQ5GT | ASI224MC | Stack of 200 frames in very good seeing conditions (1 arcs). Alentejo, Portugal.
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