Solar flares — Sep 20, 2025
The strongest solar flare in the day
Flare of C3.4 level (normal) — in 21:11
Solar activity index
Value for Sep 20, 2025 24:00 (end on the day). The maximum value is 10.0
Solar flares in 2 days
Chart of solar activity from Sep 19, 2025 to Sep 20, 2025
Time zone — UTC+01 (London) - summer time
This chart in PNG format — high resolution
API data: JSON or TXT
List of solar flares for Sep 20, 2025
Total number of flares of class C and higher — 5 flares
C type — 5 | M type — 0 | X type — 0
| start | maximum | end | region | |
|---|---|---|---|---|
|
C3.4
|
20:57 | 21:11 | 21:34 | 4220 |
|
C1.6
|
16:30 | 16:33 | 16:36 | 4220 |
|
C1.3
|
09:41 | 09:48 | 09:59 | 4216 |
|
C1.5
|
08:02 | 08:08 | 08:18 | 4216 |
|
C2.6
|
05:34 | 05:52 | 06:21 | 4219 |