Solar Flare WatchHome › Flare history › 1981
M8.2 solar flare on 1981-04-04
ClassM8.2NOAA report
Peak08:351981-04-04 UTC
Duration21 min
Peak flux8.2e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 50 / 4022 |
| Other M/X flares that day | 4 |
| M/X flares that month | 87 |
| Solar cycle | Cycle 21 |
| Position on disk | N36E72 |
| Active region | AR 3027 (25 flares) |
Compared with the strongest flares of 1981
X5.9
X5.5
X4.0
X3.6
X3.5
X3.1
X3.0
X2.7
X2.6
X2.5
X2.4
X2.3
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 05:02 | 05:03 | 3 | X1.9 | S44W85 | 2999 | |
| 08:02 | 08:09 | 41 | M2.0 | N02E34 | 3022 | |
| 10:00 | 10:05 | 11 | M2.1 | – | – | |
| 21:48 | 22:06 | 52 | M1.0 | N18E71 | 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.
← X1.9 1981-04-04M5.1 1981-04-08 →
About this page
A M8.2 flare that began 1981-04-04 08:30 UTC; No. 50 of 4,022 C-class-or-larger flares in 1981.