Solar Flare WatchHome › Flare history › 2025
X1.2 solar flare on 2025-06-17
ClassX1.2GOES-18 science data
Peak21:492025-06-17 UTC
Duration16 min
Peak flux1.2e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (since Jun 2017) | 77 / 108 |
| Rank in year | 11 / 3004 |
| Other M/X flares that day | 1 |
| M/X flares that month | 19 |
| 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 |
|---|---|---|---|---|---|---|
| 23:45 | 00:00 | 30 | M1.5 | – | – |
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.
← M6.3 2025-06-16X1.8 2025-06-19 →
About this page
A X1.2 flare that began 2025-06-17 21:38 UTC; No. 11 of 3,004 C-class-or-larger flares in 2025.