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Solar flares in October 1990
C-class224
M-class11
X-class0
LargestM8.51990-10-20
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| October 1989 | 142 | 34 | 5 | X13.0 |
| October 1990 | 224 | 11 | 0 | M8.5 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1990-10-20 | 17:59 | 18:10 | 22 | M8.5 | N15W82 | 6311 |
| 1990-10-21 | 05:56 | 05:59 | 60 | M3.0 | N14W89 | 6311 |
| 1990-10-22 | 07:04 | 07:06 | 10 | M2.9 | S08W50 | 6322 |
| 1990-10-15 | 01:25 | 01:35 | 59 | M2.8 | S21E41 | 6321 |
| 1990-10-21 | 09:24 | 09:32 | 23 | M1.7 | N18E32 | 6327 |
| 1990-10-09 | 08:53 | 09:09 | 52 | M1.6 | S18E71 | 6314 |
| 1990-10-08 | 06:52 | 07:06 | 37 | M1.5 | – | – |
| 1990-10-16 | 17:16 | 17:28 | 17 | M1.4 | – | – |
| 1990-10-10 | 17:55 | 18:01 | 40 | M1.1 | S17E60 | 6314 |
| 1990-10-11 | 07:36 | 07:39 | 40 | M1.0 | N09E44 | 6312 |
| 1990-10-21 | 03:13 | 03:21 | 17 | M1.0 | N16W92 | 6311 |
| 1990-10-15 | 12:24 | 12:26 | 27 | C9.5 | N16W45 | 6316 |
| 1990-10-20 | 04:52 | 05:02 | 26 | C8.4 | N18W79 | 6311 |
| 1990-10-15 | 02:38 | 02:42 | 31 | C8.3 | S21E36 | 6321 |
| 1990-10-10 | 01:04 | 01:19 | 35 | C7.9 | S17E68 | 6314 |
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 1990November 1990 →
About this page
235 flares of class C or larger in October 1990; by M/X count it ranks 222 of 565 months.