Solar Flare WatchHome › Flare history › 1991
X2.1 solar flare on 1991-08-25
ClassX2.1NOAA report
Peak00:491991-08-25 UTC
Duration272 min
Peak flux2.1e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 187 / 491 |
| Rank in year | 23 / 3297 |
| Other M/X flares that day | 4 |
| M/X flares that month | 35 |
| Solar cycle | Cycle 22 |
| Position on disk | N24E77 |
| Active region | AR 6805 (26 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 |
|---|---|---|---|---|---|---|
| 05:04 | 05:49 | 76 | M1.8 | N24E75 | 6805 | |
| 09:18 | 09:34 | 33 | M1.3 | N24E70 | 6805 | |
| 18:18 | 18:27 | 58 | M1.0 | S09E60 | 6807 | |
| 23:20 | 23:33 | 89 | M2.4 | N25E67 | 6805 |
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.
← M6.7 1991-08-16X3.3 1991-09-07 →
About this page
A X2.1 flare that began 1991-08-25 00:31 UTC; No. 23 of 3,297 C-class-or-larger flares in 1991.