Solar flares on September 20, 2025
The most powerful solar flare in 24 hours
C3.4 (normal) flare - September 20 at 8:11 PM
Solar activity index
Value as of the end of the day on September 20, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 19, 2025 to September 20, 2025
Time zone — UTC+00
List of solar flares for September 20, 2025
The total number of solar flares of class C and higher — 5 flares
C class — 5 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.4 | 19:57 | 20:11 | 20:34 | 4220 |
| C1.6 | 15:30 | 15:33 | 15:36 | 4220 |
| C1.3 | 08:41 | 08:48 | 08:59 | 4216 |
| C1.5 | 07:02 | 07:08 | 07:18 | 4216 |
| C2.6 | 04:34 | 04:52 | 05:21 | 4219 |