Solar Flare WatchHome › Flare history › 1981
M8.1 solar flare on 1981-09-05
ClassM8.1NOAA report
Peak00:021981-09-05 UTC
Duration12 min
Peak flux8.1e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 51 / 4022 |
| Other M/X flares that day | 4 |
| M/X flares that month | 43 |
| Solar cycle | Cycle 21 |
| Position on disk | S11W64 |
| Active region | AR 3300 (28 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 |
|---|---|---|---|---|---|---|
| 08:16 | 08:37 | 39 | M1.2 | N07E70 | 3317 | |
| 10:33 | 10:33 | 58 | M2.6 | N08E77 | 3317 | |
| 18:18 | 18:21 | 17 | M4.3 | S12W62 | 3300 | |
| 18:55 | 19:02 | 52 | M2.8 | N09E63 | 3317 |
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.
← M7.4 1981-09-03M6.1 1981-09-06 →
About this page
A M8.1 flare that began 1981-09-05 23:53 UTC; No. 51 of 4,022 C-class-or-larger flares in 1981.