Solar Flare WatchHome › Flare history › 2011
M7.4 solar flare on 2011-09-25
ClassM7.4NOAA report
Peak04:502011-09-25 UTC
Duration34 min
Peak flux7.4e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 11 / 1319 |
| Other M/X flares that day | 5 |
| M/X flares that month | 35 |
| Solar cycle | Cycle 24 |
| Active region | AR 11302 (52 flares) |
Compared with the strongest flares of 2011
X6.9
X2.2
X2.1
X1.9
X1.9
X1.8
X1.5
X1.4
M9.3
M9.3
M7.4
M7.1
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 02:27 | 02:33 | 10 | M4.4 | – | 11302 | |
| 08:46 | 08:49 | 6 | M3.1 | – | 11302 | |
| 09:25 | 09:35 | 28 | M1.5 | – | 11303 | |
| 15:26 | 15:33 | 12 | M3.7 | – | 11302 | |
| 16:51 | 16:58 | 18 | M2.2 | – | 11302 |
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.
← M5.8 2011-09-24X1.9 2011-11-03 →
About this page
A M7.4 flare that began 2011-09-25 04:31 UTC; No. 11 of 1,319 C-class-or-larger flares in 2011.