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X1.9 solar flare on 1991-10-27
ClassX1.9NOAA report
Peak02:101991-10-27 UTC
Duration51 min
Peak flux1.9e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 209 / 491 |
| Rank in year | 28 / 3297 |
| Other M/X flares that day | 3 |
| M/X flares that month | 58 |
| Solar cycle | Cycle 22 |
| Position on disk | S11E20 |
| 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 | |
| 05:38 | 05:49 | 80 | X6.1 | S13E15 | 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.
← X1.7 1991-10-26X6.1 1991-10-27 →
About this page
A X1.9 flare that began 1991-10-27 02:06 UTC; No. 28 of 3,297 C-class-or-larger flares in 1991.