Moderately strong M4.3 solar flare erupts from southeast limb

Moderately strong M4.3 solar flare erupts from southeast limb

An impulsive solar flare measuring M4.3 at its peak time erupted from the southeast limb of the Sun on October 16, 2014. The event started at 12:58, peaked at 13:03 and ended at 13:05 UTC.

A 10cm Radio Burst (TenFlare) lasting 1 minute (180 sfu) was associated with the event. The source is the same region that erupted with impressive M2.2 solar flare on October 14th. Elevated solar activity is expected as the region rotates onto the Earth side of the Sun.

At 07:37 UTC, a C7.7 flare occurred from the same location. A Type IV radio sweep was reported at 07:22 UTC and some material could be seen in SDO/AIA 304 imagery surging south of the flare location. A C6.4 flare followed at 09:23 UTC from the same area, likely the vicinity of Old Regions 2172 (S12, L=241) and 2173 (S14, L=250). 

NOAA SWPC forecasters estimate 20% chance for M-class, and 01% chance for X-class solar flares over the next three days (October 16 - 18).

Generally nominal solar wind conditions are expected during the same period with an occasional sector boundary crossing. No significant recurrent or transient solar wind speed features are expected.

Space Weather Message Code: SUM10R

Serial Number: 634
Issue Time: 2014 Oct 16 1327 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2014 Oct 16 1301 UTC
Maximum Time: 2014 Oct 16 1301 UTC
End Time: 2014 Oct 16 1302 UTC
Duration: 1 minutes
Peak Flux: 180 sfu
Latest Penticton Noon Flux: 126 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.



The are currently 7 numbered sunspot region on the visible disk today. All of them are either stable or decaying. Regions 2185 (S15W85) and 2188 (N18W56) decayed to plage during last 24 hours.

Sunspots on October 16, 2014. Image credit: ESA PROBA2/SWAP

2185 - Alpha
2186 - Alpha
2187 - Beta
2188 - Beta
2189 - Beta
2190 - Beta
2191 - Beta

Featured image: NASA SDO AIA 304 at 13:04 UTC on October 16, 2014.

Tags: m-class


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