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X1.5 solar flare on 2003-03-18

ClassX1.5NOAA report

Peak12:082003-03-18 UTC

Duration29 min

Peak flux1.5e-04W/m²

Comparison	Value
Rank among X flares (1975 – Jun 2017)	272 / 491
Rank in year	12 / 1496
Other M/X flares that day	2
M/X flares that month	9
Solar cycle	Cycle 23
Position on disk	S15W46
Active region	AR 10314 (34 flares)

Compared with the strongest flares of 2003

X28.0 11-04X28.0

X17.2 10-28X17.2

X10.0 10-29X10.0

X8.3 11-02X8.3

X5.4 10-23X5.4

X3.9 11-03X3.9

X3.6 05-28X3.6

X2.7 11-03X2.7

X1.7 06-09X1.7

X1.6 06-11X1.6

X1.5 03-17X1.5

X1.5 03-18X1.5

Other M/X flares that day

Date	Begin	Peak	Min	Class	Location	Region
	00:30	00:37	12	M1.6	S15W44	10314
	05:51	06:00	11	M2.5	S15W46	10314

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.

← X1.5 2003-03-17 M5.1 2003-04-23 →

About this page

A X1.5 flare that began 2003-03-18 11:51 UTC; No. 12 of 1,496 C-class-or-larger flares in 2003.