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X1.9 solar flare on 2011-09-24
ClassX1.9NOAA report
Peak09:402011-09-24 UTC
Duration27 min
Peak flux1.9e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 212 / 491 |
| Rank in year | 4 / 1319 |
| Other M/X flares that day | 8 |
| 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 |
|---|---|---|---|---|---|---|
| 12:33 | 13:20 | 97 | M7.1 | – | 11302 | |
| 16:36 | 16:59 | 39 | M1.7 | – | 11295 | |
| 17:19 | 17:25 | 12 | M3.1 | – | 11302 | |
| 17:59 | 18:15 | 25 | M2.8 | – | 11302 | |
| 19:09 | 19:21 | 32 | M3.0 | – | 11302 | |
| 20:29 | 20:36 | 13 | M5.8 | – | 11302 | |
| 21:23 | 21:27 | 9 | M1.2 | – | 11303 | |
| 23:45 | 23:58 | 24 | M1.0 | – | 11303 |
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.
← X1.4 2011-09-22M7.1 2011-09-24 →
About this page
A X1.9 flare that began 2011-09-24 09:21 UTC; No. 4 of 1,319 C-class-or-larger flares in 2011.