Solar Flare WatchHome › Flare history › 2011
X2.1 solar flare on 2011-09-06
ClassX2.1NOAA report
Peak22:202011-09-06 UTC
Duration12 min
Peak flux2.1e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 192 / 491 |
| Rank in year | 3 / 1319 |
| Other M/X flares that day | 1 |
| M/X flares that month | 35 |
| Solar cycle | Cycle 24 |
| Active region | AR 11283 (20 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
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.
← M5.3 2011-09-06X1.8 2011-09-07 →
About this page
A X2.1 flare that began 2011-09-06 22:12 UTC; No. 3 of 1,319 C-class-or-larger flares in 2011.