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Monthly overview (Aug 1991)

The monthly mean values of the geomagnetic field components at Kakioka are D: -6��52.8��, H: 30106nT, Z: 35010nT and F: 46175nT for August 1991.

Monthly average of the K-index daily sum is 22.9. indicates an extremely high level of geomagnetic activity during the month.

Notable geomagnetic events include 6 magnetic storms, 3 si, 5 bay, 4 sfe, 0 pi and 0 pc.

The international 5 quietest days are the 10,13,24,25,26^th.

The international 5 most disturbed days are the 2,12,19,20,31^th.

Date	K-index daily sum	Geomagnetic activity	Geomagnetic phenomena	International 5 quietest days	International 5 quietest days	geomagnetic 1-minute value plot
1	25	disturbed				plot
2	33	disturbed	storm bay sfe		��	plot
3	26	disturbed				plot
4	28	disturbed				plot
5	24	disturbed	si			plot
6	24	disturbed	bay			plot
7	19	moderately disturbed				plot
8	14	moderately calm				plot
9	23	disturbed				plot
10	14	moderately calm		��		plot
11	28	disturbed	storm			plot
12	29	disturbed	si		��	plot
13	13	moderately calm		��		plot
14	20	moderately disturbed				plot
15	28	disturbed				plot
16	23	disturbed	sfe			plot
17	23	disturbed				plot
18	20	moderately disturbed	storm			plot
19	35	disturbed	si		��	plot
20	36	disturbed	storm		��	plot
21	30	disturbed				plot
22	25	disturbed				plot
23	14	moderately calm	bay			plot
24	17	moderately disturbed		��		plot
25	15	moderately calm	sfe	��		plot
26	12	moderately calm				plot
27	22	moderately disturbed	storm			plot
28	16	moderately calm				plot
29	16	moderately calm	sfe			plot
30	29	disturbed	storm bay			plot
31	28	disturbed	bay			plot

*) Plot diagram opens in a separate window.