Solar Flare WatchHome › Flare history › 1990
M8.5 solar flare on 1990-10-20
ClassM8.5NOAA report
Peak18:101990-10-20 UTC
Duration22 min
Peak flux8.5e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 19 / 2551 |
| Other M/X flares that day | 0 |
| M/X flares that month | 11 |
| Solar cycle | Cycle 22 |
| Position on disk | N15W82 |
| Active region | AR 6311 (12 flares) |
Compared with the strongest flares of 1990
X9.3
X5.5
X3.6
X3.4
X3.0
X2.4
X2.2
X1.9
X1.8
X1.7
X1.5
X1.4
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.
← M5.3 1990-09-17M7.5 1990-11-26 →
About this page
A M8.5 flare that began 1990-10-20 17:59 UTC; No. 19 of 2,551 C-class-or-larger flares in 1990.