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Solar flares in October 2011
C-class123
M-class8
X-class0
LargestM3.92011-10-02
Sunspot number116.1NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| October 2010 | 15 | 1 | 0 | M2.9 |
| October 2011 | 123 | 8 | 0 | M3.9 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2011-10-02 | 00:37 | 00:50 | 22 | M3.9 | – | 11305 |
| 2011-10-20 | 03:10 | 03:25 | 34 | M1.6 | – | – |
| 2011-10-31 | 17:21 | 18:08 | 89 | M1.4 | – | – |
| 2011-10-02 | 17:19 | 17:23 | 7 | M1.3 | – | 11302 |
| 2011-10-21 | 12:53 | 13:00 | 15 | M1.3 | – | 11319 |
| 2011-10-22 | 10:00 | 11:10 | 189 | M1.3 | – | 11314 |
| 2011-10-01 | 08:56 | 09:59 | 81 | M1.2 | – | 11305 |
| 2011-10-31 | 14:55 | 15:08 | 32 | M1.1 | – | – |
| 2011-10-05 | 12:36 | 12:42 | 20 | C9.2 | – | 11313 |
| 2011-10-02 | 21:20 | 21:49 | 45 | C7.6 | – | 11305 |
| 2011-10-03 | 00:20 | 00:30 | 34 | C7.6 | – | 11302 |
| 2011-10-04 | 08:56 | 09:23 | 66 | C7.3 | – | 11302 |
| 2011-10-16 | 15:04 | 15:14 | 18 | C6.3 | – | 11319 |
| 2011-10-05 | 10:43 | 11:22 | 54 | C6.1 | – | 11313 |
| 2011-10-19 | 04:49 | 04:55 | 11 | C5.5 | – | 11324 |
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
131 flares of class C or larger in October 2011; by M/X count it ranks 271 of 565 months.