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Monthly overview (May 1990)

The monthly mean values of the geomagnetic field components at Kakioka are D: -6��50��, H: 30140nT, Z: 34950nT and F: 46152nT for May 1990.

Monthly average of the K-index daily sum is 17.2. indicates a high level of geomagnetic activity during the month.

Notable geomagnetic events include 3 magnetic storms, 3 si, 3 bay, 4 sfe, 0 pi and 0 pc.

The international 5 quietest days are the 6,14,15,16,17^th.

The international 5 most disturbed days are the 10,18,22,26,27^th.

Date	K-index daily sum	Geomagnetic activity	Geomagnetic phenomena	International 5 quietest days	International 5 quietest days	geomagnetic 1-minute value plot
1	18	moderately disturbed				plot
2	17	moderately disturbed	bay			plot
3	20	moderately disturbed				plot
4	19	moderately disturbed				plot
5	16	moderately calm				plot
6	12	moderately calm		��		plot
7	09	calm				plot
8	17	moderately disturbed				plot
9	22	moderately disturbed				plot
10	26	disturbed			��	plot
11	21	moderately disturbed	sfe			plot
12	05	calm				plot
13	15	moderately calm				plot
14	05	calm		��		plot
15	09	calm		��		plot
16	06	calm		��		plot
17	10	calm				plot
18	27	disturbed	storm		��	plot
19	20	moderately disturbed				plot
20	18	moderately disturbed				plot
21	22	moderately disturbed	storm si			plot
22	32	disturbed	bay		��	plot
23	14	moderately calm	sfe			plot
24	08	calm	sfe			plot
25	22	moderately disturbed				plot
26	29	disturbed	storm		��	plot
27	31	disturbed	bay			plot
28	12	moderately calm				plot
29	17	moderately disturbed				plot
30	22	moderately disturbed	si			plot
31	13	moderately calm				plot

*) Plot diagram opens in a separate window.