Solar Flare WatchHome › Flare history › 2026
M8.1 solar flare on 2026-08-20
ClassM8.1GOES-18 science data
Peak11:422026-08-20 UTC
Duration22 min
Peak flux8.1e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 16 / 1764 |
| Other M/X flares that day | 2 |
| M/X flares that month | 13 |
| Solar cycle | Cycle 25 |
Compared with the strongest flares of 2026
X8.1
X4.2
X2.8
X2.5
X2.4
X1.9
X1.6
X1.5
X1.4
X1.2
X1.1
X1.0
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 07:30 | 08:05 | 47 | M1.8 | – | – | |
| 15:51 | 16:11 | 30 | M2.9 | – | – |
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 2026-07-05M6.9 2026-08-25 →
About this page
A M8.1 flare that began 2026-08-20 11:32 UTC; No. 16 of 1,764 C-class-or-larger flares in 2026.