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Monthly overview (Sep 1990)

The monthly mean values of the geomagnetic field components at Kakioka are D: -6��50.4��, H: 30137nT, Z: 34961nT and F: 46158nT for September 1990.

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 0 magnetic storms, 1 si, 2 bay, 0 sfe, 0 pi and 0 pc.

The international 5 quietest days are the 2,3,27,29,30^th.

The international 5 most disturbed days are the 1,11,15,16,22^th.

Date	K-index daily sum	Geomagnetic activity	Geomagnetic phenomena	International 5 quietest days	International 5 quietest days	geomagnetic 1-minute value plot
1	21	moderately disturbed	si		��	plot
2	02	extremely calm		��		plot
3	07	calm		��		plot
4	13	moderately calm				plot
5	17	moderately disturbed				plot
6	22	moderately disturbed				plot
7	20	moderately disturbed				plot
8	14	moderately calm				plot
9	10	calm				plot
10	17	moderately disturbed				plot
11	27	disturbed			��	plot
12	21	moderately disturbed				plot
13	20	moderately disturbed				plot
14	22	moderately disturbed				plot
15	25	disturbed	bay		��	plot
16	23	disturbed			��	plot
17	16	moderately calm				plot
18	20	moderately disturbed				plot
19	21	moderately disturbed				plot
20	16	moderately calm				plot
21	20	moderately disturbed				plot
22	18	moderately disturbed				plot
23	16	moderately calm				plot
24	19	moderately disturbed	bay			plot
25	16	moderately calm				plot
26	17	moderately disturbed				plot
27	12	moderately calm		��		plot
28	11	moderately calm				plot
29	10	calm		��		plot
30	05	calm				plot

*) Plot diagram opens in a separate window.