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Solar flares in October 2015
C-class148
M-class10
X-class0
LargestM5.52015-10-02
Sunspot number59.6NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| October 2014 | 146 | 41 | 6 | X3.1 |
| October 2015 | 148 | 10 | 0 | M5.5 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2015-10-02 | 00:06 | 00:13 | 11 | M5.5 | S19W67 | 12422 |
| 2015-10-01 | 13:03 | 13:10 | 11 | M4.5 | S23W64 | 12422 |
| 2015-10-17 | 20:35 | 20:42 | 11 | M1.5 | – | – |
| 2015-10-15 | 23:27 | 23:31 | 10 | M1.1 | S11E50 | 12434 |
| 2015-10-16 | 06:11 | 06:16 | 9 | M1.1 | S11E46 | 12434 |
| 2015-10-17 | 20:09 | 20:23 | 19 | M1.1 | – | – |
| 2015-10-02 | 12:19 | 12:26 | 12 | M1.0 | – | – |
| 2015-10-02 | 17:08 | 17:18 | 15 | M1.0 | S19W76 | 12422 |
| 2015-10-04 | 02:34 | 02:41 | 14 | M1.0 | – | – |
| 2015-10-31 | 17:48 | 17:52 | 7 | M1.0 | N06E51 | 12443 |
| 2015-10-31 | 19:27 | 19:33 | 13 | C9.9 | N06E50 | 12443 |
| 2015-10-13 | 14:05 | 14:11 | 9 | C9.5 | – | – |
| 2015-10-02 | 15:26 | 15:32 | 11 | C8.8 | S20W73 | 12422 |
| 2015-10-17 | 18:39 | 18:51 | 21 | C8.6 | – | – |
| 2015-10-02 | 17:55 | 18:00 | 8 | C8.0 | S19W77 | 12422 |
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.
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About this page
158 flares of class C or larger in October 2015; by M/X count it ranks 246 of 565 months.