Solar Flare WatchHome › Flare history › 2001
M7.9 solar flare on 2001-04-09
ClassM7.9NOAA report
Peak15:342001-04-09 UTC
Duration40 min
Peak flux7.9e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 29 / 2429 |
| Other M/X flares that day | 0 |
| M/X flares that month | 46 |
| Solar cycle | Cycle 23 |
| Position on disk | S21W04 |
| Active region | AR 9415 (27 flares) |
Compared with the strongest flares of 2001
X20.0
X14.4
X6.2
X5.6
X5.3
X3.4
X2.8
X2.6
X2.3
X2.0
X1.7
X1.6
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.
← X5.6 2001-04-06X2.3 2001-04-10 →
About this page
A M7.9 flare that began 2001-04-09 15:20 UTC; No. 29 of 2,429 C-class-or-larger flares in 2001.