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M8.3 solar flare on 1981-01-28

ClassM8.3NOAA report

Peak04:221981-01-28 UTC

Duration10 min

Peak flux8.3e-05W/m²

Comparison	Value
Rank in year	47 / 4022
Other M/X flares that day	2
M/X flares that month	29
Solar cycle	Cycle 21
Position on disk	S13E57
Active region	AR 2911 (40 flares)

Compared with the strongest flares of 1981

X5.9 04-24X5.9

X5.5 04-27X5.5

X4.0 02-26X4.0

X3.6 10-07X3.6

X3.5 07-26X3.5

X3.1 10-12X3.1

X3.0 10-14X3.0

X2.7 07-19X2.7

X2.6 08-12X2.6

X2.5 04-10X2.5

X2.4 02-20X2.4

X2.3 02-24X2.3

Other M/X flares that day

Date	Begin	Peak	Min	Class	Location	Region
	02:05	02:15	64	M1.7	S13E54	2911
	15:44	15:56	58	M2.2	S16E73	2918

All times UTC. Until June 2017 classes are NOAA's reports of the time (GOES-15 and earlier included a 0.7 scaling factor); later classes come from calibrated GOES-16/18 data, so the same flare reads about 1.4× larger. Do not compare the two periods directly.

← M9.0 1981-01-25 X1.0 1981-02-17 →

About this page

A M8.3 flare that began 1981-01-28 04:12 UTC; No. 47 of 4,022 C-class-or-larger flares in 1981.