Home › Flare history › 2012

M5.5 solar flare on 2012-08-18

ClassM5.5NOAA report

Peak01:022012-08-18 UTC

Duration43 min

Peak flux5.5e-05W/m²

Comparison	Value
Rank in year	20 / 1388
Other M/X flares that day	4
M/X flares that month	10
Solar cycle	Cycle 24
Position on disk	N21W65
Active region	AR 11543 (5 flares)

Compared with the strongest flares of 2012

X5.4 03-07X5.4

X1.8 10-23X1.8

X1.7 01-27X1.7

X1.4 07-12X1.4

X1.3 03-07X1.3

X1.1 03-05X1.1

X1.1 07-06X1.1

M9.0 10-20M9.0

M8.7 01-23M8.7

M8.4 03-10M8.4

M7.9 03-13M7.9

M7.7 07-19M7.7

Other M/X flares that day

Begin	Peak	Min	Class	Location	Region
03:17	03:23	13	M1.9	N19E86	–
16:02	16:07	7	M2.0	N22E80	11548
22:46	22:54	14	M1.0	N19E78	11548
23:15	23:22	17	M1.3	N19E76	11548

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.

← M5.7 2012-07-31 M9.0 2012-10-20 →

About this page

A M5.5 flare that began 2012-08-18 00:24 UTC; No. 20 of 1,388 C-class-or-larger flares in 2012.