Strong M8.2 solar flare erupts from Region 3435

m8.2 solar flare september 20 2023 sdo aia 304

A strong solar flare measuring M8.2 erupted from Active Region 3435 at 14:19 UTC on September 20, 2023. The event started at 14:11 and ended at 14:25 UTC.

A Type II Radio Emission with an estimated velocity of 1 054 km/s was registered at 14:25 UTC. Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection (CME) is associated with a flare event.

While the location of this region does not favor Earth-directed CMEs, it’s possible a part of it is heading our way.

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LASCO coronagraph imagery is still not available. Analysis of the event is in progress.

The region is rotating toward the center of the disk so Earth-directed CMEs are possible from this region in the days ahead.

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sunspots on september 20 2023
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Radio frequencies were forecast to be most degraded over South America, the Atlantic Ocean, and parts of west Africa at the time of the flare.

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The same region was responsible for M4.0 solar flare at 20:14 UTC on September 19. A subsequent CME was first seen in SOHO/LASCO C2 imagery at 20:36 UTC. Modeling results determined no Earth-directed component, SWPC said.

In 24 hours to 12:30 UTC today, solar wind parameters indicated waning influence from a CME that left the Sun on September 16.

Solar wind enhancements from the passing CME are expected to trend back toward background levels on September 20 and 21. A further enhancement is likely on September 20 due to the anticipated onset of negative polarity coronal hole high speed stream (CH HSS).

You can follow space weather in near real-time using our redesigned SWX application at

Alerts, Watches and Warnings published by the SWPC as well as C+ solar flares are posted at (Twitter) and (Telegram).

Featured image credit: NASA SDO/AIA 304


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