Solar flares on June 18, 2025
The most powerful solar flare in 24 hours
C9.2 (normal) flare - June 18 at 12:43 AM
Solar activity index
Value as of the end of the day on June 18, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from June 17, 2025 to June 18, 2025
Time zone — UTC-02:30 (Saint john's) — summer time
List of solar flares for June 18, 2025
The total number of solar flares of class C and higher — 20 flares
C class — 20 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.7 | 22:53 | 23:00 | 23:06 | — |
| C4.1 | 20:36 | 20:43 | 20:47 | 4114 |
| C1.2 | 20:18 | 20:21 | 20:23 | — |
| C3.0 | 19:04 | 19:09 | 19:13 | 4114 |
| C2.0 | 18:07 | 18:16 | 18:19 | 4114 |
| C1.5 | 16:24 | 16:31 | 16:34 | — |
| C1.9 | 15:47 | 15:52 | 15:57 | — |
| C1.6 | 15:33 | 15:37 | 15:41 | — |
| C3.0 | 13:37 | 13:46 | 13:58 | 4114 |
| C2.1 | 12:53 | 13:01 | 13:13 | 4114 |
| C2.6 | 11:30 | 11:37 | 11:43 | 4117 |
| C5.2 | 09:58 | 10:04 | 10:07 | 4117 |
| C4.7 | 08:39 | 09:01 | 09:10 | 4114 |
| C6.9 | 06:44 | 07:00 | 07:25 | 4117 |
| C3.9 | 06:00 | 06:06 | 06:16 | 4117 |
| C5.5 | 03:50 | 03:55 | 03:57 | — |
| C5.5 | 03:08 | 03:44 | 03:50 | — |
| C4.7 | 02:53 | 03:03 | 03:08 | 4117 |
| C4.1 | 02:34 | 02:42 | 02:53 | 4117 |
| C9.2 | 00:33 | 00:43 | 00:51 | 4115 |