The monthly mean values of the geomagnetic field components at Kakioka are D: -6°-52.7′°, H: 30100nT, Z: 35019nT and F: 46177nT for October 1991.
Monthly average of the K-index daily sum is 23.5. indicates an extremely high level of geomagnetic activity during the month.
Notable geomagnetic events include 5 magnetic storms, 8 si, 6 bay, 3 sfe, 0 pi and 0 pc.
The international 5 quietest days are the 12,13,15,16,17th.
The international 5 most disturbed days are the 1,2,28,29,31th.
Plot of the geomagnetic hourly value for October 1991
Plot of the K-index daily total sum for 1991
Details of the geomagnetic storms in October 1991
| Date | K-index daily sum |
Geomagnetic activity |
Geomagnetic phenomena |
International 5 quietest days |
International 5 quietest days |
geomagnetic 1-minute value plot |
|---|---|---|---|---|---|---|
| 1 | 31 | disturbed | ○ | plot | ||
| 2 | 34 | disturbed | ○ | plot | ||
| 3 | 19 | moderately disturbed | plot | |||
| 4 | 26 | disturbed | plot | |||
| 5 | 19 | moderately disturbed | plot | |||
| 6 | 25 | disturbed | plot | |||
| 7 | 26 | disturbed | plot | |||
| 8 | 29 | disturbed | plot | |||
| 9 | 15 | moderately calm | plot | |||
| 10 | 24 | disturbed | plot | |||
| 11 | 17 | moderately disturbed | plot | |||
| 12 | 10 | calm | ○ | plot | ||
| 13 | 11 | moderately calm | ○ | plot | ||
| 14 | 10 | calm | plot | |||
| 15 | 10 | calm | ○ | plot | ||
| 16 | 08 | calm | ○ | plot | ||
| 17 | 14 | moderately calm | ○ | plot | ||
| 18 | 21 | moderately disturbed | plot | |||
| 19 | 20 | moderately disturbed | plot | |||
| 20 | 27 | disturbed | plot | |||
| 21 | 31 | disturbed | plot | |||
| 22 | 24 | disturbed | plot | |||
| 23 | 23 | disturbed | plot | |||
| 24 | 26 | disturbed | plot | |||
| 25 | 27 | disturbed | plot | |||
| 26 | 27 | disturbed | plot | |||
| 27 | 33 | disturbed | plot | |||
| 28 | 43 | disturbed | ○ | plot | ||
| 29 | 42 | disturbed | ○ | plot | ||
| 30 | 24 | disturbed | plot | |||
| 31 | 34 | disturbed | ○ | plot |
*) Plot diagram opens in a separate window.
