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Solar flares in October 1991
C-class254
M-class53
X-class5
LargestX6.11991-10-27
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| October 1990 | 224 | 11 | 0 | M8.5 |
| October 1991 | 254 | 53 | 5 | X6.1 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1991-10-27 | 05:38 | 05:49 | 80 | X6.1 | S13E15 | 6891 |
| 1991-10-30 | 06:11 | 06:21 | 172 | X2.5 | S08W25 | 6891 |
| 1991-10-24 | 02:37 | 02:41 | 38 | X2.1 | S14E59 | 6891 |
| 1991-10-27 | 02:06 | 02:10 | 51 | X1.9 | S11E20 | 6891 |
| 1991-10-26 | 18:53 | 20:51 | 272 | X1.7 | S09E20 | 6891 |
| 1991-10-24 | 21:56 | 22:36 | 139 | M9.8 | S12E46 | 6891 |
| 1991-10-14 | 17:34 | 17:39 | 75 | M6.6 | S24E34 | 6878 |
| 1991-10-13 | 18:10 | 18:16 | 91 | M6.0 | N22E82 | 6879 |
| 1991-10-04 | 19:24 | 19:28 | 54 | M5.2 | N09E12 | 6861 |
| 1991-10-29 | 17:40 | 18:55 | 171 | M4.7 | S10W23 | 6891 |
| 1991-10-30 | 19:13 | 19:16 | 17 | M4.3 | S10W35 | 6891 |
| 1991-10-27 | 12:33 | 13:04 | 55 | M3.3 | S14E14 | 6891 |
| 1991-10-24 | 16:54 | 17:14 | 55 | M3.2 | S15E51 | 6891 |
| 1991-10-01 | 06:10 | 06:16 | 15 | M3.0 | S22E13 | 6853 |
| 1991-10-12 | 10:02 | 10:08 | 23 | M2.9 | – | – |
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.
← September 1991November 1991 →
About this page
312 flares of class C or larger in October 1991; by M/X count it ranks 25 of 565 months.