Solar Flare WatchHome › Flare history › 1991
X12.0 solar flare on 1991-06-15
ClassX12.0NOAA report
Peak08:311991-06-15 UTC
Duration284 min
Peak flux1.2e-03W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 16 / 491 |
| Rank in year | 5 / 3297 |
| Other M/X flares that day | 1 |
| M/X flares that month | 72 |
| Solar cycle | Cycle 22 |
| Position on disk | N33W69 |
| Active region | AR 6659 (72 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
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.
← M7.3 1991-06-14M5.5 1991-06-15 →
About this page
A X12.0 flare that began 1991-06-15 06:33 UTC; No. 5 of 3,297 C-class-or-larger flares in 1991.