Solar Flare WatchHome › Flare history › 1991
X2.1 solar flare on 1991-10-24
ClassX2.1NOAA report
Peak02:411991-10-24 UTC
Duration38 min
Peak flux2.1e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 188 / 491 |
| Rank in year | 24 / 3297 |
| Other M/X flares that day | 8 |
| M/X flares that month | 58 |
| Solar cycle | Cycle 22 |
| Position on disk | S14E59 |
| Active region | AR 6891 (81 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 |
|---|---|---|---|---|---|---|
| 00:38 | 01:00 | 59 | M1.9 | S12E61 | 6891 | |
| 01:21 | 01:28 | 18 | M1.4 | S20E62 | 6892 | |
| 06:28 | 06:33 | 74 | M1.2 | S12E56 | 6891 | |
| 09:46 | 09:47 | 16 | M1.3 | S15E63 | 6891 | |
| 11:07 | 11:08 | 6 | M1.2 | S12E53 | 6891 | |
| 16:48 | 16:50 | 11 | M2.5 | S20E54 | 6892 | |
| 16:54 | 17:14 | 55 | M3.2 | S15E51 | 6891 | |
| 21:56 | 22:36 | 139 | M9.8 | S12E46 | 6891 |
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.
← M6.6 1991-10-14M9.8 1991-10-24 →
About this page
A X2.1 flare that began 1991-10-24 02:37 UTC; No. 24 of 3,297 C-class-or-larger flares in 1991.