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M8.4 solar flare on 2025-06-15
ClassM8.4GOES-18 science data
Peak18:072025-06-15 UTC
Duration40 min
Peak flux8.4e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 22 / 3004 |
| Other M/X flares that day | 3 |
| 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 |
|---|---|---|---|---|---|---|
| 07:45 | 07:56 | 17 | M2.2 | – | – | |
| 10:32 | 10:47 | 21 | M1.9 | – | – | |
| 23:43 | 23:57 | 22 | 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.
← M6.8 2025-06-14M6.3 2025-06-16 →
About this page
A M8.4 flare that began 2025-06-15 17:45 UTC; No. 22 of 3,004 C-class-or-larger flares in 2025.