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Solar flares in September 2015
C-class47
M-class3
X-class0
LargestM2.12015-09-20
Sunspot number72.5NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| September 2014 | 129 | 9 | 1 | X1.6 |
| September 2015 | 47 | 3 | 0 | M2.1 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2015-09-20 | 17:32 | 18:03 | 57 | M2.1 | S20W24 | 12415 |
| 2015-09-20 | 04:55 | 05:03 | 22 | M1.5 | – | – |
| 2015-09-17 | 09:34 | 09:40 | 11 | M1.1 | S21W04 | 12415 |
| 2015-09-17 | 02:52 | 03:03 | 17 | C9.5 | S21W01 | 12415 |
| 2015-09-21 | 05:11 | 05:18 | 11 | C8.8 | N08E79 | 12420 |
| 2015-09-16 | 19:08 | 19:20 | 16 | C7.8 | S20E01 | 12415 |
| 2015-09-17 | 21:07 | 21:15 | 12 | C6.7 | S19W12 | 12415 |
| 2015-09-16 | 23:48 | 23:57 | 16 | C6.0 | – | – |
| 2015-09-17 | 03:11 | 03:14 | 6 | C4.9 | S21W01 | 12415 |
| 2015-09-21 | 01:57 | 02:04 | 11 | C4.2 | N08E83 | 12420 |
| 2015-09-17 | 22:56 | 23:00 | 9 | C3.9 | S19W15 | 12415 |
| 2015-09-17 | 19:47 | 19:54 | 10 | C3.3 | S19W12 | 12415 |
| 2015-09-23 | 18:54 | 18:57 | 7 | C3.3 | – | – |
| 2015-09-17 | 18:08 | 18:18 | 19 | C3.2 | S20W10 | 12415 |
| 2015-09-16 | 02:05 | 02:24 | 31 | C3.0 | – | – |
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
50 flares of class C or larger in September 2015; by M/X count it ranks 365 of 565 months.