Home › Flare history › 2005

X1.5 solar flare on 2005-09-13

ClassX1.5NOAA report

Peak19:272005-09-13 UTC

Duration98 min

Peak flux1.5e-04W/m²

Comparison	Value
Rank among X flares (1975 – Jun 2017)	273 / 491
Rank in year	11 / 699
Other M/X flares that day	2
M/X flares that month	36
Solar cycle	Cycle 23
Active region	AR 10808 (77 flares)

Compared with the strongest flares of 2005

X17.0 09-07X17.0

X7.1 01-20X7.1

X6.2 09-09X6.2

X5.4 09-08X5.4

X3.8 01-17X3.8

X3.6 09-09X3.6

X2.6 01-15X2.6

X2.1 09-10X2.1

X1.7 01-01X1.7

X1.7 09-13X1.7

X1.5 09-13X1.5

X1.3 01-19X1.3

Other M/X flares that day

Date	Begin	Peak	Min	Class	Location	Region
	10:41	11:21	43	M1.3	–	–
	23:15	23:22	15	X1.7	–	10808

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.

← M6.1 2005-09-12 X1.7 2005-09-13 →

About this page

A X1.5 flare that began 2005-09-13 19:19 UTC; No. 11 of 699 C-class-or-larger flares in 2005.