Solar Flare WatchHome › Flare history › 1991
X6.1 solar flare on 1991-10-27
ClassX6.1NOAA report
Peak05:491991-10-27 UTC
Duration80 min
Peak flux6.1e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 40 / 491 |
| Rank in year | 10 / 3297 |
| Other M/X flares that day | 3 |
| M/X flares that month | 58 |
| Solar cycle | Cycle 22 |
| Position on disk | S13E15 |
| 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 |
|---|---|---|---|---|---|---|
| 00:24 | 00:31 | 35 | M2.3 | S14E19 | 6891 | |
| 02:06 | 02:10 | 51 | X1.9 | S11E20 | 6891 | |
| 12:33 | 13:04 | 55 | M3.3 | S14E14 | 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.
← X1.9 1991-10-27X2.5 1991-10-30 →
About this page
A X6.1 flare that began 1991-10-27 05:38 UTC; No. 10 of 3,297 C-class-or-larger flares in 1991.