On 4 September 2025 at 19:10 UT, C3.4 class flare erupted from NOAA active region 14206. The flare was captured by GONG station at Cerro Tololo, Chile. A portion of an active region filament situated near the main sunspot of this region starts slowly rising about 30 minutes before the eruption. After the eruption, dark filament material can be seen in a low part of image as material is leaving the Sun. After the filament erupts, two bright ribbons develop, moving apart from the past filament location. This is a classical two-ribbon flare, which is usually accompanied by a coronal mass ejection (CME). The eruption took place near the solar central meridian, and if it was a CME, it would likely be Earth-directed. In this movie created with different image scaling, one can briefly see a dark circular front centered at the eruption site (see image below). This is a signature of the Moreton (blast) wave, which maybe another indication of CME. Unfortunately, LASCO C3 coronagraph has about 4 hour gap in observations between 16:54 UT and 21:06 UT, and thus, similar to previous event, it is not clear if it was a CME or not.
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