Solar Flare WatchHome › Flare history › 1991
X1.2 solar flare on 1991-02-25
ClassX1.2NOAA report
Peak08:221991-02-25 UTC
Duration81 min
Peak flux1.2e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 331 / 491 |
| Rank in year | 41 / 3297 |
| Other M/X flares that day | 2 |
| M/X flares that month | 53 |
| Solar cycle | Cycle 22 |
| Position on disk | S16W80 |
| Active region | AR 6497 (5 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 |
|---|---|---|---|---|---|---|
| 16:01 | 16:01 | 8 | M2.8 | S17W45 | 6504 | |
| 16:51 | 17:16 | 44 | M1.0 | S15W23 | 6517 |
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.
← M7.2 1991-02-08X7.1 1991-03-04 →
About this page
A X1.2 flare that began 1991-02-25 08:09 UTC; No. 41 of 3,297 C-class-or-larger flares in 1991.