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Solar flares in September 1987
C-class27
M-class1
X-class0
LargestM1.31987-09-21
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| September 1986 | 1 | 0 | 0 | C2.6 |
| September 1987 | 27 | 1 | 0 | M1.3 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1987-09-21 | 01:57 | 02:04 | 17 | M1.3 | S35W64 | 4853 |
| 1987-09-11 | 21:58 | 22:02 | 14 | C7.5 | S24W62 | 4849 |
| 1987-09-14 | 00:30 | 00:33 | 25 | C6.7 | S34E23 | 4853 |
| 1987-09-01 | 15:27 | 15:41 | 122 | C6.6 | S26E59 | 4848 |
| 1987-09-05 | 00:06 | 00:20 | 34 | C3.1 | S25E32 | 4849 |
| 1987-09-07 | 12:05 | 12:11 | 30 | C3.1 | S24E02 | 4849 |
| 1987-09-07 | 16:03 | 16:17 | 44 | C3.1 | S24W00 | 4849 |
| 1987-09-07 | 07:29 | 07:33 | 17 | C2.9 | S23E08 | 4849 |
| 1987-09-08 | 08:39 | 08:43 | 14 | C1.9 | S22W10 | 4849 |
| 1987-09-17 | 20:08 | 20:11 | 16 | C1.8 | S27E63 | 4856 |
| 1987-09-07 | 03:30 | 03:31 | 13 | C1.7 | S24E10 | 4849 |
| 1987-09-10 | 22:19 | 22:21 | 47 | C1.7 | S21W46 | 4849 |
| 1987-09-11 | 04:25 | 04:25 | 11 | C1.6 | S22W47 | 4849 |
| 1987-09-11 | 18:04 | 18:21 | 56 | C1.6 | S21W55 | 4849 |
| 1987-09-04 | 01:47 | 01:49 | 15 | C1.4 | S24E45 | 4849 |
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
28 flares of class C or larger in September 1987; by M/X count it ranks 411 of 565 months.