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Monthly overview (Apr 1990)

The monthly mean values of the geomagnetic field components at Kakioka are D: -6��50.4��, H: 30113nT, Z: 34950nT and F: 46134nT for April 1990.

Monthly average of the K-index daily sum is 21.6. indicates an extremely high level of geomagnetic activity during the month.

Notable geomagnetic events include 5 magnetic storms, 2 si, 4 bay, 2 sfe, 0 pi and 0 pc.

The international 5 quietest days are the 1,6,7,8,19^th.

The international 5 most disturbed days are the 10,11,12,14,17^th.

Date	K-index daily sum	Geomagnetic activity	Geomagnetic phenomena	International 5 quietest days	International 5 quietest days	geomagnetic 1-minute value plot
1	08	calm		��		plot
2	19	moderately disturbed				plot
3	22	moderately disturbed	bay			plot
4	11	moderately calm				plot
5	18	moderately disturbed				plot
6	16	moderately calm		��		plot
7	14	moderately calm		��		plot
8	12	moderately calm		��		plot
9	28	disturbed	storm			plot
10	43	disturbed			��	plot
11	31	disturbed	bay		��	plot
12	39	disturbed	storm bay		��	plot
13	30	disturbed				plot
14	29	disturbed			��	plot
15	22	moderately disturbed				plot
16	14	moderately calm	sfe			plot
17	27	disturbed	storm			plot
18	17	moderately disturbed				plot
19	10	calm				plot
20	17	moderately disturbed				plot
21	15	moderately calm				plot
22	17	moderately disturbed				plot
23	31	disturbed	storm si bay			plot
24	26	disturbed				plot
25	21	moderately disturbed				plot
26	16	moderately calm				plot
27	22	moderately disturbed				plot
28	26	disturbed				plot
29	27	disturbed	storm			plot
30	21	moderately disturbed				plot

*) Plot diagram opens in a separate window.