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Monthly overview (May 1991)

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, 3 si, 1 bay, 3 sfe, 0 pi and 0 pc.

The international 5 quietest days are the 11,12,18,19,20^th.

The international 5 most disturbed days are the 2,14,17,25,31^th.

Date	K-index daily sum	Geomagnetic activity	Geomagnetic phenomena	International 5 quietest days	International 5 quietest days	geomagnetic 1-minute value plot
1	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	sfe			plot
9	14	moderately calm				plot
10	16	moderately calm				plot
11	05	calm		��		plot
12	07	calm		��		plot
13	23	disturbed	storm			plot
14	25	disturbed			��	plot
15	15	moderately calm				plot
16	16	moderately calm	storm sfe			plot
17	26	disturbed			��	plot
18	09	calm		��		plot
19	10	calm		��		plot
20	07	calm				plot
21	11	moderately calm	si			plot
22	21	moderately disturbed	si			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	sfe			plot
30	16	moderately calm				plot
31	28	disturbed	storm si bay			plot

*) Plot diagram opens in a separate window.