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Solar flares in April 1981
C-class217
M-class74
X-class13
LargestX5.91981-04-24
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| April 1980 | 127 | 35 | 2 | X0.5 |
| April 1981 | 217 | 74 | 13 | X5.9 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1981-04-24 | 13:46 | 14:11 | 229 | X5.9 | N18W50 | 3049 |
| 1981-04-27 | 07:20 | 08:20 | 145 | X5.5 | – | 3049 |
| 1981-04-10 | 16:32 | 17:03 | 32 | X2.5 | N07W35 | 3025 |
| 1981-04-01 | 01:15 | 01:17 | 86 | X2.3 | S43W52 | 2999 |
| 1981-04-02 | 11:03 | 11:05 | 25 | X2.2 | S43W68 | 2999 |
| 1981-04-04 | 05:02 | 05:03 | 3 | X1.9 | S44W85 | 2999 |
| 1981-04-24 | 01:18 | 01:52 | 71 | X1.4 | N16W42 | 3049 |
| 1981-04-18 | 21:12 | 21:18 | 63 | X1.3 | N11W47 | 3038 |
| 1981-04-26 | 10:57 | 12:35 | 199 | X1.2 | – | 3049 |
| 1981-04-28 | 21:04 | 21:14 | 99 | X1.2 | – | 3049 |
| 1981-04-10 | 10:59 | 11:14 | 23 | X1.1 | N11E53 | 3035 |
| 1981-04-18 | 10:44 | 10:54 | 40 | X1.0 | – | – |
| 1981-04-20 | 16:12 | 16:14 | 98 | X1.0 | N12W77 | 3035 |
| 1981-04-03 | 09:12 | 10:15 | 125 | M8.3 | – | 2999 |
| 1981-04-04 | 08:30 | 08:35 | 21 | M8.2 | N36E72 | 3027 |
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
304 flares of class C or larger in April 1981; by M/X count it ranks 14 of 565 months.