Solar Flare WatchHome › Flare history › 1981
M5.9 solar flare on 1981-08-13
ClassM5.9NOAA report
Peak08:091981-08-13 UTC
Duration42 min
Peak flux5.9e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 60 / 4022 |
| Other M/X flares that day | 5 |
| M/X flares that month | 58 |
| Solar cycle | Cycle 21 |
| Position on disk | S10W41 |
| Active region | AR 3257 (82 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 |
|---|---|---|---|---|---|---|
| 00:30 | 00:46 | 28 | M1.4 | – | – | |
| 02:50 | 02:57 | 44 | M3.6 | S11W46 | 3257 | |
| 07:16 | 07:22 | 49 | M1.8 | S08W58 | 3257 | |
| 13:33 | 13:59 | 40 | M1.1 | – | 3257 | |
| 21:32 | 21:36 | 21 | M1.1 | S11W63 | 3257 |
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.
← X2.6 1981-08-12M9.0 1981-08-27 →
About this page
A M5.9 flare that began 1981-08-13 07:57 UTC; No. 60 of 4,022 C-class-or-larger flares in 1981.