Solar Flare WatchHome › Flare history › 1991
M9.8 solar flare on 1991-04-15
ClassM9.8NOAA report
Peak10:151991-04-15 UTC
Duration58 min
Peak flux9.8e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 55 / 3297 |
| Other M/X flares that day | 3 |
| M/X flares that month | 42 |
| Solar cycle | Cycle 22 |
| Position on disk | S11E70 |
| Active region | AR 6593 (22 flares) |
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 |
|---|---|---|---|---|---|---|
| 14:28 | 14:35 | 55 | M2.5 | S10E65 | 6593 | |
| 15:44 | 15:54 | 47 | M4.2 | S13E67 | 6593 | |
| 19:01 | 19:05 | 49 | M3.9 | N06E08 | 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.
← M9.5 1991-04-11X1.0 1991-04-20 →
About this page
A M9.8 flare that began 1991-04-15 09:23 UTC; No. 55 of 3,297 C-class-or-larger flares in 1991.