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M7.4 solar flare on 1989-10-18

ClassM7.4NOAA report

Peak18:251989-10-18 UTC

Duration164 min

Peak flux7.4e-05W/m²

Comparison	Value
Rank in year	85 / 2608
Other M/X flares that day	2
M/X flares that month	39
Solar cycle	Cycle 22
Position on disk	S25E15
Active region	AR 5747 (53 flares)

Compared with the strongest flares of 1989

X20.0 08-16X20.0

X15.0 03-06X15.0

X13.0 10-19X13.0

X9.8 09-29X9.8

X6.5 03-17X6.5

X5.7 10-24X5.7

X4.5 03-10X4.5

X4.1 06-15X4.1

X4.0 03-09X4.0

X4.0 11-21X4.0

X3.9 02-09X3.9

X3.6 03-16X3.6

Other M/X flares that day

Date	Begin	Peak	Min	Class	Location	Region
	00:15	–	135	M2.7	S30E30	5747
	04:36	04:42	34	M1.6	S30E28	5747

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.

← X9.8 1989-09-29 X13.0 1989-10-19 →

About this page

A M7.4 flare that began 1989-10-18 18:06 UTC; No. 85 of 2,608 C-class-or-larger flares in 1989.