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Solar flares in September 1981
C-class376
M-class42
X-class1
LargestX2.31981-09-15
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| September 1980 | 197 | 13 | 0 | M8.3 |
| September 1981 | 376 | 42 | 1 | X2.3 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1981-09-15 | 21:13 | 21:14 | 15 | X2.3 | N10W78 | 3317 |
| 1981-09-07 | 05:05 | 05:11 | 30 | M9.5 | N10E40 | 3317 |
| 1981-09-10 | 09:38 | 09:43 | 6 | M8.4 | N07E04 | 3317 |
| 1981-09-05 | 23:53 | 00:02 | 12 | M8.1 | S11W64 | 3300 |
| 1981-09-07 | 20:06 | 20:07 | 15 | M7.9 | S13W83 | 3300 |
| 1981-09-03 | 22:57 | 23:04 | 58 | M7.4 | S13E16 | 3310 |
| 1981-09-06 | 23:51 | 23:54 | 10 | M6.1 | – | 3317 |
| 1981-09-07 | 00:05 | 00:11 | 27 | M5.7 | N10E40 | 3317 |
| 1981-09-05 | 18:18 | 18:21 | 17 | M4.3 | S12W62 | 3300 |
| 1981-09-07 | 22:23 | 22:26 | 11 | M4.2 | N10E27 | 3317 |
| 1981-09-06 | 21:12 | 21:14 | 60 | M3.1 | N09E49 | 3317 |
| 1981-09-11 | 03:12 | 03:23 | 30 | M3.1 | N06W15 | 3317 |
| 1981-09-07 | 12:17 | 12:18 | 21 | M2.9 | N15E31 | 3317 |
| 1981-09-05 | 18:55 | 19:02 | 52 | M2.8 | N09E63 | 3317 |
| 1981-09-09 | 21:56 | 22:18 | 39 | M2.8 | N08E10 | 3317 |
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
419 flares of class C or larger in September 1981; by M/X count it ranks 57 of 565 months.