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01 december 2025, 09:14 мск

VIDEO: X1.9 flare occurs on the Sun last night

Solar flare X1.9 of December 1, 2025

High-level X-ray flares have resumed on the Sun. Early this morning at 02:49 UTC, a new X1.9 event was recorded on the northeastern edge of the Sun after a two-week hiatus (since November 14). For science, the entire situation appears, in a sense, utter madness, as the explosion on the Earth-facing side of the star was once again produced by the same single region on the Sun (No. 4274), which has essentially single-handedly generated all extreme solar activity over the past two months. It was this very active center that, back in the second half of October, at a time that now seems infinitely distant, was lashing out with plasma emissions at the interstellar object 3I/ATLAS (https://t.me/lpixras/1660) as it passed behind the Sun. It also "terrorized" Earth in the first half of November, when, after a six-month lull on the Sun, it produced five high-level X-ray flares at once. It was here that the two largest flares of the year occurred, X5.1 on November 11 and X4.0 on November 14, after which, due to the Sun's rotation, the active center moved to the far side of the Sun for two weeks, beyond the right western horizon. And today, after the active region passed along the far side and returned to Earth's field of view on the left edge, a new X-level explosion occurred there on the very first day.

Due to its location, the event has almost no potential to impact Earth with plasma strikes. The exceptional beauty of the flare, accompanied by large ejections of matter, was particularly impressive from this viewing angle. The forecast for the coming week, however, based on the nighttime observations, appears quite negative. It is clear that the active center has fully retained its, frankly, completely inexplicable, bottomless energy reserves during its stay on the far side of the Sun and is unlikely to suddenly disintegrate in the next 3-4 days, having already lived on the Sun for two months. After this time, approximately on Thursday, December 4, the region will enter the Earth's impact zone and begin to strike the Earth with plasma clouds. An additional negative factor is the presence of a second major active region, No. 4294, currently active on the Sun in the southern hemisphere, which is likely the largest this year. If explosions begin there as well (despite its size, it hasn't yet shown extreme activity), then, to put it mildly, the beginning of December 2025 could make history in solar physics.

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Laboratory of Solar Astronomy,SRI RAS

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