Solar flares — Dec 17, 2025
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The strongest solar flare in the day
Flare of C1.3 level (normal) — in 08:40
Solar activity index
Value for Dec 17, 2025 24:00 (end on the day). The maximum value is 10.0
Solar flares in 2 days
Chart of solar activity from Dec 16, 2025 to Dec 17, 2025
Time zone — UTC+00 (London)
This chart in PNG format — high resolution
API data: JSON or TXT
List of solar flares for Dec 17, 2025
Total number of flares of class C and higher — 2 flares
C type — 2 | M type — 0 | X type — 0
| start | maximum | end | region | |
|---|---|---|---|---|
|
C1.0
|
09:48 | 09:55 | 10:00 | 4307 |
|
C1.3
|
08:27 | 08:40 | 09:01 | 4307 |