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378 observation(s) found

H-alpha - 2026-02-08

H-alpha

by JMM44 February 8, 2026

#h-alpha

Observation Solaire du 08 Décembre 2025

H-alpha, Calcium (H), Calcium (K), H-beta

by Piluc17 December 8, 2025 1

#h-alpha #taches-solaires #protubrances #calcium #doppler #h-beta

Observation agrémentée d'une surprise,puisqu'un avion de ligne s'est invité lors de l'acquisition d'une séquence sur le H-alpha. Des touristes rentrant de Barcelone et allant à Dublin,j'ai joint une capture d'écran de flightradar24.

H-alpha - 2025-11-11

H-alpha

by Stephan Schmelzing November 11, 2025 1

#h-alpha

On November 11, 2025, active region AR 4274 produced an exceptionally powerful X5.1 flare at 10:04 UT during the ongoing Solar Cycle 25. As of now, this flare is the most energetic solar eruption of the year 2025. By chance, I had observed the region shortly beforehand in several spectral lines using a spectroheliograph—my spectroheliogram was taken just 23 minutes before the flare. It was actually only a brief scan under modest seeing conditions, but in retrospect it is fascinating to see what the region looked like shortly before such a strong event.