Major (M- and X-class) flares and filament eruptions are usually accompany CMEs, but not always. On 31 August 2025 at about 14:00 UT, M1.3-class flare was recorded in NOAA active regions 14197. This is the region that had about hundred sunspots early this week. The flare activated large quiescent filament south of this region with a partial filament eruption at about 16:15 UT (upper panel). Then, at about 18:00 UT a small two-ribbon flare and filament eruption were observed in NOAA region 14202 to the East of region 14197 (second panel from the top). See GONG video of these events at the bottom panel. Despite this activity, there was no obvious sign of CMEs in LASCO coronagraph. There is gap in observations in LASCO C2 between 17:24 UT and 18:36 UT, and coronal streamers appear to be pushed apart during this gap. So, maybe it was a CME but LASCO missed it? Or maybe these were the failed filament eruptions?
X-ray flare in a growing active region
Active region 14366 crossed East solar limb at about 18:00 UT on 29 January, 2026. The region was growing rapidly, and it was a location of ...
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