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

Monthly overview (Sep 1991)

The monthly mean values of the geomagnetic field components at Kakioka are D: -6��52.4��, H: 30114nT, Z: 35014nT and F: 46183nT for September 1991.

Monthly average of the K-index daily sum is 17.5. indicates a high level of geomagnetic activity during the month.

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

The international 5 quietest days are the 17,18,21,23,24^th.

The international 5 most disturbed days are the 1,9,25,27,28^th.

Date	K-index daily sum	Geomagnetic activity	Geomagnetic phenomena	International 5 quietest days	International 5 quietest days	geomagnetic 1-minute value plot
1	26	disturbed			��	plot
2	24	disturbed	bay			plot
3	17	moderately disturbed				plot
4	14	moderately calm				plot
5	21	moderately disturbed	sfe			plot
6	15	moderately calm				plot
7	12	moderately calm				plot
8	21	moderately disturbed	bay			plot
9	31	disturbed	storm si		��	plot
10	23	disturbed				plot
11	24	disturbed	si			plot
12	14	moderately calm				plot
13	15	moderately calm				plot
14	22	moderately disturbed				plot
15	11	moderately calm				plot
16	10	calm				plot
17	07	calm		��		plot
18	06	calm		��		plot
19	14	moderately calm				plot
20	09	calm				plot
21	04	calm		��		plot
22	13	moderately calm				plot
23	05	calm		��		plot
24	09	calm	storm			plot
25	26	disturbed			��	plot
26	33	disturbed				plot
27	29	disturbed			��	plot
28	25	disturbed				plot
29	19	moderately disturbed				plot
30	26	disturbed				plot

*) Plot diagram opens in a separate window.