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Solar flares in October 1987
C-class24
M-class2
X-class0
LargestM1.71987-10-16
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| October 1986 | 30 | 1 | 0 | M4.7 |
| October 1987 | 24 | 2 | 0 | M1.7 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1987-10-16 | 09:50 | 10:02 | 20 | M1.7 | – | 4866 |
| 1987-10-17 | 12:21 | 12:23 | 40 | M1.4 | S25W36 | 4870 |
| 1987-10-17 | 22:07 | 22:41 | 101 | C7.7 | S25W39 | 4870 |
| 1987-10-15 | 11:08 | 11:14 | 21 | C4.5 | N22E07 | 4866 |
| 1987-10-30 | 21:02 | 22:15 | 223 | C3.3 | – | – |
| 1987-10-20 | 00:05 | 00:11 | 13 | C2.3 | S27W70 | 4870 |
| 1987-10-28 | 01:16 | 01:49 | 96 | C2.3 | – | – |
| 1987-10-16 | 09:16 | 09:19 | 7 | C2.1 | S24W24 | 4870 |
| 1987-10-03 | 15:51 | 15:53 | 93 | C1.8 | S23E15 | 4859 |
| 1987-10-18 | 20:33 | 20:48 | 17 | C1.8 | – | – |
| 1987-10-26 | 12:01 | 12:11 | 11 | C1.8 | S25E75 | 4878 |
| 1987-10-17 | 23:27 | 23:31 | 13 | C1.7 | – | – |
| 1987-10-17 | 13:44 | 13:50 | 26 | C1.6 | N18W20 | 4866 |
| 1987-10-05 | 21:33 | 21:35 | 15 | C1.5 | N35E32 | 4862 |
| 1987-10-07 | 02:40 | 02:50 | 24 | C1.3 | N32E16 | 4862 |
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 1987November 1987 →
About this page
26 flares of class C or larger in October 1987; by M/X count it ranks 388 of 565 months.