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Solar flares in April 1991
C-class172
M-class41
X-class1
LargestX1.01991-04-20
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| April 1990 | 168 | 21 | 3 | X2.2 |
| April 1991 | 172 | 41 | 1 | X1.0 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1991-04-20 | 08:27 | 08:52 | 177 | X1.0 | N08W50 | 6583 |
| 1991-04-15 | 09:23 | 10:15 | 58 | M9.8 | S11E70 | 6593 |
| 1991-04-11 | 11:03 | 11:17 | 58 | M9.5 | – | – |
| 1991-04-02 | 22:51 | 23:20 | 134 | M6.1 | N14W00 | 6562 |
| 1991-04-11 | 05:42 | 06:12 | 64 | M4.9 | N10E68 | 6583 |
| 1991-04-15 | 15:44 | 15:54 | 47 | M4.2 | S13E67 | 6593 |
| 1991-04-15 | 19:01 | 19:05 | 49 | M3.9 | N06E08 | 6583 |
| 1991-04-20 | 08:42 | 09:01 | 52 | M3.5 | – | – |
| 1991-04-28 | 07:46 | 07:57 | 60 | M3.5 | S31W56 | 6603 |
| 1991-04-16 | 15:58 | 16:01 | 39 | M3.3 | N06W02 | 6583 |
| 1991-04-13 | 08:41 | 08:52 | 86 | M3.1 | – | – |
| 1991-04-15 | 14:28 | 14:35 | 55 | M2.5 | S10E65 | 6593 |
| 1991-04-11 | 08:23 | 08:42 | 91 | M2.4 | N09E66 | 6583 |
| 1991-04-16 | 01:36 | 01:40 | 59 | M2.4 | – | – |
| 1991-04-16 | 13:20 | 14:02 | 116 | M2.4 | N06W03 | 6583 |
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
214 flares of class C or larger in April 1991; by M/X count it ranks 60 of 565 months.