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Monthly overview (Dec 1999)

The monthly mean values of the geomagnetic field components at Kakioka are D: -7°-3′°, H: 30020nT, Z: 35374nT and F: 46395nT for December 1999.

Monthly average of the K-index daily sum is 14.1. indicates a moderate level of geomagnetic activity during the month.

Notable geomagnetic events include 1 magnetic storms, 1 si, 1 bay, 1 sfe, 2 pi and 0 pc.

The international 5 quietest days are the 14,21,22,23,26^th.

The international 5 most disturbed days are the 4,5,6,13,31^th.

Date	K-index daily sum	Geomagnetic activity	Geomagnetic phenomena	International 5 quietest days	International 5 quietest days	geomagnetic 1-minute value plot
1	12	moderately calm				plot
2	12	moderately calm				plot
3	23	disturbed	bay			plot
4	27	disturbed	pi		○	plot
5	24	disturbed	pi		○	plot
6	24	disturbed			○	plot
7	20	moderately disturbed				plot
8	20	moderately disturbed				plot
9	17	moderately disturbed				plot
10	16	moderately calm				plot
11	11	moderately calm				plot
12	16	moderately calm	storm si			plot
13	28	disturbed			○	plot
14	10	calm		○		plot
15	05	calm				plot
16	11	moderately calm				plot
17	09	calm				plot
18	10	calm				plot
19	08	calm				plot
20	05	calm				plot
21	01	extremely calm		○		plot
22	01	extremely calm		○		plot
23	06	calm		○		plot
24	18	moderately disturbed				plot
25	19	moderately disturbed				plot
26	04	calm		○		plot
27	14	moderately calm				plot
28	10	calm	sfe			plot
29	10	calm				plot
30	17	moderately disturbed				plot
31	29	disturbed			○	plot

*) Plot diagram opens in a separate window.