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Solar flares in September 1990
C-class149
M-class16
X-class0
LargestM5.31990-09-17
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| September 1989 | 176 | 65 | 6 | X9.8 |
| September 1990 | 149 | 16 | 0 | M5.3 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1990-09-17 | 21:40 | 21:56 | 36 | M5.3 | S15E29 | 6272 |
| 1990-09-14 | 13:32 | 13:33 | 5 | M3.5 | S20E90 | – |
| 1990-09-01 | 06:58 | 07:06 | 33 | M2.7 | N14W31 | 6233 |
| 1990-09-05 | 04:26 | 04:40 | 65 | M2.7 | N14W87 | 6233 |
| 1990-09-23 | 13:05 | 13:13 | 17 | M2.7 | – | – |
| 1990-09-19 | 09:05 | 09:06 | 31 | M2.6 | N06E90 | 6281 |
| 1990-09-03 | 09:43 | 09:47 | 50 | M2.2 | N12W57 | 6233 |
| 1990-09-06 | 21:08 | 21:51 | 102 | M1.9 | – | – |
| 1990-09-25 | 02:21 | 02:28 | 31 | M1.7 | N15E09 | 6280 |
| 1990-09-14 | 20:05 | 20:10 | 93 | M1.6 | N19E25 | 6263 |
| 1990-09-12 | 00:57 | 01:13 | 96 | M1.5 | N06W45 | 6247 |
| 1990-09-04 | 14:37 | 14:49 | 51 | M1.4 | N14W73 | 6233 |
| 1990-09-14 | 04:10 | 04:12 | 51 | M1.3 | S29E43 | 6266 |
| 1990-09-17 | 13:19 | 13:45 | 64 | M1.3 | S15E30 | 6272 |
| 1990-09-22 | 03:06 | 03:19 | 51 | M1.1 | S27W60 | 6266 |
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
165 flares of class C or larger in September 1990; by M/X count it ranks 182 of 565 months.