Solar Flare WatchHome › Flare history › 1981
M7.2 solar flare on 1981-08-03
ClassM7.2NOAA report
Peak20:281981-08-03 UTC
Duration41 min
Peak flux7.2e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 56 / 4022 |
| Other M/X flares that day | 5 |
| M/X flares that month | 58 |
| Solar cycle | Cycle 21 |
| 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 |
|---|---|---|---|---|---|---|
| 04:23 | 04:30 | 21 | M1.1 | S08W70 | 3234 | |
| 09:56 | 10:08 | 29 | M1.3 | – | – | |
| 11:18 | 11:30 | 22 | M1.2 | – | 3234 | |
| 16:30 | 16:52 | 45 | M2.8 | S11W90 | 3234 | |
| 23:41 | 23:43 | 43 | M2.9 | – | 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.
← M5.1 1981-07-30X2.6 1981-08-12 →
About this page
A M7.2 flare that began 1981-08-03 20:15 UTC; No. 56 of 4,022 C-class-or-larger flares in 1981.