Solar Flare WatchHome › Flare history › 1991
M6.8 solar flare on 1991-02-04
ClassM6.8NOAA report
Peak10:511991-02-04 UTC
Duration30 min
Peak flux6.8e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 79 / 3297 |
| Other M/X flares that day | 5 |
| M/X flares that month | 53 |
| Solar cycle | Cycle 22 |
| Position on disk | S17W87 |
| Active region | AR 6469 (46 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 |
|---|---|---|---|---|---|---|
| 01:42 | 01:51 | 31 | M2.8 | S12W81 | 6469 | |
| 08:16 | 08:29 | 15 | M1.0 | – | – | |
| 15:51 | 16:49 | 72 | M1.2 | S15W92 | 6469 | |
| 17:13 | 17:28 | 38 | M1.0 | – | – | |
| 18:28 | 18:42 | 55 | M3.6 | S15W89 | 6469 |
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.
← X1.3 1991-01-31M8.8 1991-02-07 →
About this page
A M6.8 flare that began 1991-02-04 10:47 UTC; No. 79 of 3,297 C-class-or-larger flares in 1991.