The monthly mean values of the geomagnetic field components at Kakioka are D: -7°-58.7′°, H: 30122nT, Z: 36001nT and F: 46941nT for September 2025.
Monthly average of the K-index daily sum is 16.6. indicates a slightly high level of geomagnetic activity during the month.
Notable geomagnetic events include 3 magnetic storms, 1 si, 7 bay, 0 sfe, 4 pi and 4 pc.
The international 5 quietest days are the 7,19,20,21,27th.
The international 5 most disturbed days are the 2,6,15,29,30th.
Plot of the geomagnetic hourly value for September 2025
Plot of the K-index daily total sum for 2025
Details of the geomagnetic storms in September 2025
| Date | K-index daily sum |
Geomagnetic activity |
Geomagnetic phenomena |
International 5 quietest days |
International 5 quietest days |
geomagnetic 1-minute value plot |
|---|---|---|---|---|---|---|
| 1 | 16 | moderately calm | storm si pc | plot | ||
| 2 | 34 | disturbed | ○ | plot | ||
| 3 | 16 | moderately calm | plot | |||
| 4 | 15 | moderately calm | bay | plot | ||
| 5 | 14 | moderately calm | plot | |||
| 6 | 24 | disturbed | bay pi | ○ | plot | |
| 7 | 3 | extremely calm | ○ | plot | ||
| 8 | 20 | moderately disturbed | plot | |||
| 9 | 19 | moderately disturbed | plot | |||
| 10 | 11 | moderately calm | plot | |||
| 11 | 14 | moderately calm | plot | |||
| 12 | 16 | moderately calm | bay | plot | ||
| 13 | 9 | calm | plot | |||
| 14 | 19 | moderately disturbed | storm pc | plot | ||
| 15 | 33 | disturbed | bay pi pc | ○ | plot | |
| 16 | 21 | moderately disturbed | plot | |||
| 17 | 17 | moderately disturbed | plot | |||
| 18 | 12 | moderately calm | bay | plot | ||
| 19 | 1 | extremely calm | ○ | plot | ||
| 20 | 4 | calm | ○ | plot | ||
| 21 | 12 | moderately calm | ○ | plot | ||
| 22 | 23 | disturbed | plot | |||
| 23 | 20 | moderately disturbed | bay | plot | ||
| 24 | 11 | moderately calm | pi | plot | ||
| 25 | 13 | moderately calm | plot | |||
| 26 | 8 | calm | plot | |||
| 27 | 10 | calm | ○ | plot | ||
| 28 | 17 | moderately disturbed | plot | |||
| 29 | 30 | disturbed | storm | ○ | plot | |
| 30 | 35 | disturbed | pi pc | ○ | plot |
*) Plot diagram opens in a separate window.
