Solar Flare WatchHome › Flare history › 1991
X1.1 solar flare on 1991-11-09
ClassX1.1NOAA report
Peak15:501991-11-09 UTC
Duration97 min
Peak flux1.1e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 372 / 491 |
| Rank in year | 44 / 3297 |
| Other M/X flares that day | 2 |
| M/X flares that month | 29 |
| Solar cycle | Cycle 22 |
| Position on disk | S16W57 |
| Active region | AR 6906 (21 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 |
|---|---|---|---|---|---|---|
| 03:10 | 03:14 | 21 | M1.5 | N20E08 | 6918 | |
| 20:52 | 20:52 | 13 | M1.4 | S14W69 | 6906 |
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.
← M9.1 1991-11-02M6.9 1991-11-10 →
About this page
A X1.1 flare that began 1991-11-09 15:32 UTC; No. 44 of 3,297 C-class-or-larger flares in 1991.