Solar Flare WatchHome › Flare history › 1981
M5.1 solar flare on 1981-07-30
ClassM5.1NOAA report
Peak23:461981-07-30 UTC
Duration55 min
Peak flux5.1e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 72 / 4022 |
| Other M/X flares that day | 2 |
| M/X flares that month | 74 |
| Solar cycle | Cycle 21 |
| Position on disk | S11W33 |
| Active region | AR 3234 (84 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 |
|---|---|---|---|---|---|---|
| 16:06 | 16:30 | 49 | M1.3 | – | 3234 | |
| 20:38 | 21:00 | 31 | M1.1 | – | – |
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.
← X1.5 1981-07-27M7.2 1981-08-03 →
About this page
A M5.1 flare that began 1981-07-30 23:26 UTC; No. 72 of 4,022 C-class-or-larger flares in 1981.