The monthly mean values of the geomagnetic field components at Kakioka are D: -6°-51.4′°, H: 30134nT, Z: 34989nT and F: 46177nT for May 1991.
Monthly average of the K-index daily sum is 17.1. indicates a high level of geomagnetic activity during the month.
Notable geomagnetic events include 3 magnetic storms, 5 si, 1 bay, 3 sfe, 0 pi and 0 pc.
The international 5 quietest days are the 11,12,18,19,20th.
The international 5 most disturbed days are the 2,14,17,25,31th.
Plot of the geomagnetic hourly value for May 1991
Plot of the K-index daily total sum for 1991
Details of the geomagnetic storms in May 1991
| Date | K-index daily sum |
Geomagnetic activity |
Geomagnetic phenomena |
International 5 quietest days |
International 5 quietest days |
geomagnetic 1-minute value plot |
|---|---|---|---|---|---|---|
| 1 | 24 | disturbed | plot | |||
| 2 | 30 | disturbed | ○ | plot | ||
| 3 | 17 | moderately disturbed | plot | |||
| 4 | 09 | calm | plot | |||
| 5 | 04 | calm | plot | |||
| 6 | 04 | calm | plot | |||
| 7 | 11 | moderately calm | plot | |||
| 8 | 15 | moderately calm | plot | |||
| 9 | 14 | moderately calm | plot | |||
| 10 | 16 | moderately calm | plot | |||
| 11 | 05 | calm | ○ | plot | ||
| 12 | 07 | calm | ○ | plot | ||
| 13 | 23 | disturbed | plot | |||
| 14 | 25 | disturbed | ○ | plot | ||
| 15 | 15 | moderately calm | plot | |||
| 16 | 16 | moderately calm | plot | |||
| 17 | 26 | disturbed | ○ | plot | ||
| 18 | 09 | calm | ○ | plot | ||
| 19 | 10 | calm | ○ | plot | ||
| 20 | 07 | calm | ○ | plot | ||
| 21 | 11 | moderately calm | plot | |||
| 22 | 21 | moderately disturbed | plot | |||
| 23 | 25 | disturbed | plot | |||
| 24 | 22 | moderately disturbed | plot | |||
| 25 | 27 | disturbed | ○ | plot | ||
| 26 | 23 | disturbed | plot | |||
| 27 | 24 | disturbed | plot | |||
| 28 | 25 | disturbed | plot | |||
| 29 | 20 | moderately disturbed | plot | |||
| 30 | 16 | moderately calm | plot | |||
| 31 | 28 | disturbed | ○ | plot |
*) Plot diagram opens in a separate window.
