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X1.1 solar flare on 2025-12-08
ClassX1.1GOES-18 science data
Peak05:012025-12-08 UTC
Duration15 min
Peak flux1.1e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (since Jun 2017) | 95 / 108 |
| Rank in year | 18 / 3004 |
| Other M/X flares that day | 5 |
| M/X flares that month | 34 |
| Solar cycle | Cycle 25 |
Compared with the strongest flares of 2025
X5.1
X4.0
X2.4
X1.9
X1.9
X1.8
X1.8
X1.7
X1.7
X1.2
X1.2
X1.2
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 00:33 | 00:36 | 6 | M2.0 | – | – | |
| 06:40 | 06:54 | 24 | M1.8 | – | – | |
| 12:42 | 13:05 | 39 | M1.0 | – | – | |
| 21:13 | 21:17 | 12 | M3.1 | – | – | |
| 22:04 | 22:28 | 41 | M1.2 | – | – |
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.
← M8.1 2025-12-06M5.1 2025-12-27 →
About this page
A X1.1 flare that began 2025-12-08 04:49 UTC; No. 18 of 3,004 C-class-or-larger flares in 2025.