Solar flares on September 18, 2025
The most powerful solar flare in 24 hours
C3.6 (normal) flare - September 18 at 6:41 PM
Solar activity index
Value as of the end of the day on September 18, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 17, 2025 to September 18, 2025
Time zone — UTC+03 (Sochi)
List of solar flares for September 18, 2025
The total number of solar flares of class C and higher — 6 flares
C class — 6 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.6 | 18:34 | 18:41 | 18:46 | 4220 |
| C1.8 | 17:39 | 17:47 | 17:57 | 4020 |
| C1.7 | 04:34 | 04:38 | 04:40 | 4220 |
| C2.8 | 02:55 | 03:04 | 03:13 | 4217 |
| C1.6 | 01:42 | 01:47 | 01:51 | 4220 |
| C1.4 | 01:32 | 01:38 | 01:42 | 4220 |