Home > Observation data > Monthly overview > Monthly overview (Apr 1991)

Monthly overview (Apr 1991)

The monthly mean values of the geomagnetic field components at Kakioka are D: -6��51.2��, H: 30131nT, Z: 34984nT and F: 46171nT for April 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 1 magnetic storms, 2 si, 0 bay, 1 sfe, 0 pi and 0 pc.

The international 5 quietest days are the 8,11,13,16,20^th.

The international 5 most disturbed days are the 3,4,28,29,30^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	26	disturbed				plot
3	28	disturbed			��	plot
4	32	disturbed	storm		��	plot
5	18	moderately disturbed				plot
6	14	moderately calm				plot
7	12	moderately calm				plot
8	09	calm		��		plot
9	15	moderately calm				plot
10	17	moderately disturbed				plot
11	09	calm		��		plot
12	18	moderately disturbed				plot
13	09	calm		��		plot
14	12	moderately calm				plot
15	08	calm				plot
16	07	calm		��		plot
17	17	moderately disturbed	sfe			plot
18	18	moderately disturbed				plot
19	18	moderately disturbed	si			plot
20	06	calm				plot
21	12	moderately calm				plot
22	16	moderately calm				plot
23	14	moderately calm				plot
24	17	moderately disturbed	si			plot
25	21	moderately disturbed				plot
26	16	moderately calm				plot
27	20	moderately disturbed				plot
28	23	disturbed			��	plot
29	31	disturbed			��	plot
30	26	disturbed				plot

*) Plot diagram opens in a separate window.