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M8.4 solar flare on 1981-09-10

ClassM8.4NOAA report

Peak09:431981-09-10 UTC

Duration6 min

Peak flux8.4e-05W/m²

Comparison	Value
Rank in year	46 / 4022
Other M/X flares that day	2
M/X flares that month	43
Solar cycle	Cycle 21
Position on disk	N07E04
Active region	AR 3317 (70 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
	08:10	08:22	22	M1.2	N08W02	3317
	17:27	17:30	20	M1.3	N07W09	3317

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.

← M7.9 1981-09-07 X2.3 1981-09-15 →

About this page

A M8.4 flare that began 1981-09-10 09:38 UTC; No. 46 of 4,022 C-class-or-larger flares in 1981.