Solar flares — Sep 17, 2025
The strongest solar flare in the day
Flare of C2.3 level (normal) — in 16:41
Solar activity index
Value for Sep 17, 2025 24:00 (end on the day). The maximum value is 10.0
Solar flares in 2 days
Chart of solar activity from Sep 16, 2025 to Sep 17, 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 17, 2025
Total number of flares of class C and higher — 4 flares
C type — 4 | M type — 0 | X type — 0
| start | maximum | end | region | |
|---|---|---|---|---|
|
C1.6
|
23:42 | 23:47 | 23:51 | 4220 |
|
C1.4
|
23:32 | 23:38 | 23:42 | 4220 |
|
C2.3
|
16:35 | 16:41 | 16:43 | 4216 |
|
C1.7
|
13:13 | 13:19 | 13:21 | 4216 |