Solar Flare WatchHome › Flare history › 1991
X9.4 solar flare on 1991-03-22
ClassX9.4NOAA report
Peak22:451991-03-22 UTC
Duration34 min
Peak flux9.4e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 24 / 491 |
| Rank in year | 8 / 3297 |
| Other M/X flares that day | 4 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
| Position on disk | S26E28 |
| Active region | AR 6555 (79 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 |
|---|---|---|---|---|---|---|
| 08:30 | 08:38 | 54 | M6.3 | S25E35 | 6555 | |
| 09:28 | 09:39 | 41 | M1.0 | S23E25 | 6555 | |
| 11:44 | 11:50 | 35 | M1.3 | S19E29 | 6555 | |
| 19:03 | 20:17 | 170 | M2.5 | S27E23 | 6555 |
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.
← M6.3 1991-03-22M6.8 1991-03-23 →
About this page
A X9.4 flare that began 1991-03-22 22:43 UTC; No. 8 of 3,297 C-class-or-larger flares in 1991.