Solar Flare WatchHome › Flare history › 1991
X1.3 solar flare on 1991-01-31
ClassX1.3NOAA report
Peak02:221991-01-31 UTC
Duration201 min
Peak flux1.3e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 305 / 491 |
| Rank in year | 39 / 3297 |
| Other M/X flares that day | 1 |
| M/X flares that month | 36 |
| Solar cycle | Cycle 22 |
| Position on disk | S17W35 |
| Active region | AR 6469 (46 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 |
|---|---|---|---|---|---|---|
| 11:47 | 11:55 | 72 | M1.4 | – | – |
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.
← X1.0 1991-01-30M6.8 1991-02-04 →
About this page
A X1.3 flare that began 1991-01-31 01:58 UTC; No. 39 of 3,297 C-class-or-larger flares in 1991.