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M9.0 solar flare on 1981-08-27

ClassM9.0NOAA report

Peak04:191981-08-27 UTC

Duration179 min

Peak flux9.0e-05W/m²

Comparison	Value
Rank in year	43 / 4022
Other M/X flares that day	1
M/X flares that month	58
Solar cycle	Cycle 21
Position on disk	N11W40
Active region	AR 3284 (23 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
	05:43	05:56	41	M7.6	S13E76	3300

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.

← M5.9 1981-08-13 M7.6 1981-08-27 →

About this page

A M9.0 flare that began 1981-08-27 03:51 UTC; No. 43 of 4,022 C-class-or-larger flares in 1981.