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Solar flares in September 2013
C-class25
M-class0
X-class0
LargestC3.92013-09-18
Sunspot number55.0NOAA SWPC
Flares per day (C and above)
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| September 2012 | 102 | 4 | 0 | M1.6 |
| September 2013 | 25 | 0 | 0 | C3.9 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2013-09-18 | 02:53 | 03:15 | 33 | C3.9 | – | – |
| 2013-09-20 | 11:39 | 11:53 | 24 | C3.8 | N11E76 | 11850 |
| 2013-09-04 | 04:13 | 04:28 | 18 | C3.6 | S16W36 | 11837 |
| 2013-09-04 | 05:35 | 05:40 | 14 | C2.9 | S19W35 | 11837 |
| 2013-09-04 | 08:36 | 08:41 | 26 | C2.6 | S16W38 | 11837 |
| 2013-09-20 | 12:46 | 12:51 | 14 | C2.3 | – | – |
| 2013-09-20 | 09:56 | 10:02 | 12 | C2.1 | – | – |
| 2013-09-19 | 07:58 | 08:17 | 54 | C1.8 | – | – |
| 2013-09-01 | 14:16 | 14:20 | 9 | C1.7 | N11W31 | 11834 |
| 2013-09-29 | 05:11 | 05:25 | 31 | C1.7 | N09W44 | 11850 |
| 2013-09-29 | 00:39 | 01:27 | 84 | C1.6 | – | – |
| 2013-09-05 | 19:46 | 19:54 | 14 | C1.5 | N11W50 | 11836 |
| 2013-09-05 | 21:59 | 22:21 | 33 | C1.4 | S18W58 | 11837 |
| 2013-09-03 | 17:26 | 17:51 | 45 | C1.3 | N12W59 | 11834 |
| 2013-09-04 | 21:31 | 21:35 | 8 | C1.3 | N13W36 | 11836 |
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.
About this page
25 flares of class C or larger in September 2013; by M/X count it ranks 534 of 565 months.