Solar Flare WatchHome › Flare history › 1991
M9.5 solar flare on 1991-04-11
ClassM9.5NOAA report
Peak11:171991-04-11 UTC
Duration58 min
Peak flux9.5e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 58 / 3297 |
| Other M/X flares that day | 4 |
| M/X flares that month | 42 |
| Solar cycle | Cycle 22 |
Compared with the strongest flares of 1991
X12.0
X12.0
X12.0
X12.0
X12.0
X10.0
X10.0
X9.4
X7.1
X6.1
X5.5
X5.3
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 02:52 | 03:17 | 72 | M1.2 | N29E26 | 6580 | |
| 03:21 | 03:34 | 79 | M1.0 | S20W41 | 6566 | |
| 05:42 | 06:12 | 64 | M4.9 | N10E68 | 6583 | |
| 08:23 | 08:42 | 91 | M2.4 | N09E66 | 6583 |
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.
← M6.1 1991-04-02M9.8 1991-04-15 →
About this page
A M9.5 flare that began 1991-04-11 11:03 UTC; No. 58 of 3,297 C-class-or-larger flares in 1991.