Sun prominence
Taken by Valerio Fontani on June 18, 2025 @
Londa Tuscany Italy
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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: 2025:06:18 23:17:25
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Details:
Title: Acrive zone – AR 4114 in H-alpha Observer: Valerio Fontani Location: Londa (FI), Italy Date: June 18, 2025 — 08:03 to 08:04 UT Telescope: Lunt LS60T+B600 (modified, 52 mm diaphragm) Camera: ZWO ASI224MC Filter: H-alpha (IR-cut) Capture Settings: 6.08 ms exposure, 32 fps, gain 0, gamma 18, ROI 1304×976 Frames captured: 1,940 (FireCapture v2.7.14) Processing: AutoStakkert! stacking, AstroSurface wavelets, Photoshop touch-ups
Close-up on Active Region AR 4114, captured in H-alpha less than 12 hours after its X1.2 flare. The image shows a structured umbra-penumbra system and surrounding chromospheric texture, with fine magnetic features preserved thanks to a 52 mm diaphragm and stable acquisition. Despite difficult seeing and brief wind gusts, the result maintains scientific depth and aesthetic clarity.
Photographer's website:
https://http://www.elcrab.altervista.org/
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