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X4.2 solar flare on 2026-02-04
ClassX4.2GOES-18 science data
Peak12:132026-02-04 UTC
Duration16 min
Peak flux4.2e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (since Jun 2017) | 12 / 108 |
| Rank in year | 2 / 1764 |
| Other M/X flares that day | 12 |
| M/X flares that month | 84 |
| 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 |
|---|---|---|---|---|---|---|
| 01:02 | 01:10 | 14 | M1.2 | – | – | |
| 01:26 | 01:39 | – | M1.4 | – | – | |
| 01:45 | 01:55 | 14 | M1.4 | – | – | |
| 02:22 | 02:30 | – | M2.1 | – | – | |
| 02:32 | 02:39 | 23 | M4.8 | – | – | |
| 03:48 | 03:55 | 14 | M2.1 | – | – | |
| 09:12 | 09:20 | 11 | M1.8 | – | – | |
| 10:10 | 10:12 | 5 | M3.1 | – | – | |
| 10:40 | 10:46 | – | M1.5 | – | – | |
| 10:51 | 10:55 | 7 | M1.5 | – | – | |
| 11:31 | 11:35 | 10 | M1.1 | – | – | |
| 15:25 | 15:34 | 30 | M1.8 | – | – |
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.
← M7.2 2026-02-03X1.4 2026-03-30 →
About this page
A X4.2 flare that began 2026-02-04 12:02 UTC; No. 2 of 1,764 C-class-or-larger flares in 2026.