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Monthly overview (Jul 1991)

The monthly mean values of the geomagnetic field components at Kakioka are D: -6°-52.3′°, H: 30118nT, Z: 35003nT and F: 46177nT for July 1991.

Monthly average of the K-index daily sum is 20.1. indicates an extremely high level of geomagnetic activity during the month.

Notable geomagnetic events include 2 magnetic storms, 7 si, 1 bay, 2 sfe, 0 pi and 0 pc.

The international 5 quietest days are the 5,26,28,29,31^th.

The international 5 most disturbed days are the 8,9,13,14,17^th.

Date	K-index daily sum	Geomagnetic activity	International 5 quietest days	International 5 quietest days	geomagnetic 1-minute value plot
1	19	moderately disturbed			plot
2	22	moderately disturbed			plot
3	24	disturbed			plot
4	17	moderately disturbed			plot
5	07	calm	○		plot
6	15	moderately calm			plot
7	14	moderately calm			plot
8	31	disturbed		○	plot
9	39	disturbed		○	plot
10	17	moderately disturbed			plot
11	23	disturbed			plot
12	25	disturbed			plot
13	44	disturbed		○	plot
14	34	disturbed		○	plot
15	14	moderately calm			plot
16	17	moderately disturbed			plot
17	25	disturbed		○	plot
18	18	moderately disturbed			plot
19	26	disturbed			plot
20	25	disturbed			plot
21	25	disturbed			plot
22	21	moderately disturbed			plot
23	20	moderately disturbed			plot
24	14	moderately calm			plot
25	18	moderately disturbed			plot
26	06	calm	○		plot
27	11	moderately calm			plot
28	12	moderately calm	○		plot
29	13	moderately calm	○		plot
30	15	moderately calm			plot
31	12	moderately calm	○		plot

*) Plot diagram opens in a separate window.