Home > Observation data > Major geomagnetic storms (Memambetsu)

Major magnetic storms (Memambetsu)

Significant geomagnetic storms observed at Memambetsu (Hokkaido) since 1957 are ranked below.

Ranking	Start time (UTC)	End time (UTC)	Range (nT)			Amplitude of sudden commencement in H (nT)
Ranking	Year Month Day Hour Minute	Month Day Hour	Horizontal component	Declination	Vertical component	Amplitude of sudden commencement in H (nT)
1	1982 07 13 16:17	-	796	462	412	148
2	1989 03 13 01:27	03 15 22	747	445	170	94
3	2024 05 10 17:05	05 14 00	742	376	256	103
4	1958 07 08 07:48	07 10 11	565	244	69	165
5	1959 07 15 08:02	07 17 02	563	215	100	92
6	1958 02 11 01:26	02 13 06	557	>434*	248	50
7	1967 05 25 12:35	05 29 20	547	234	112	202
8	2000 07 15 14:36	07 16 18	520	243	127	180
8	1972 08 05 14:00	08 07 18	520	379	160	63
10	2003 10 29 06:11	C	513	407	99	112
11	1960 11 12 13:48	11 14 22	490	313	139	48
11	2024 10 10 15:14	10 13 00	490	356	99	113
13	1991 03 24 03:41	03 27 18	>467*	298	138	>167*
13	2003 10 30 16:37	11 02 21	467	376	121	37
15	1960 04 30 12:14	05 02 20	454	207	68	141
16	2004 11 07 18:27	C	452	268	70	58
17	2001 03 31 00:52	04 01 15	451	368	102	30
18	2003 11 20 08:02	11 21 24	446	261	116	32
19	1957 09 13 00:46	09 14 19	434	252	118	26
20	1992 05 09 19:57	05 11 24	429	257	97	134
21	1981 07 25 13:23	07 27 18	418	184	66	122
22	2000 04 06 16:39	04 07 20	414	191	86	80
23	2005 05 15 02:38	05 16 18	403	202	90	49
24	1960 03 31 09:55	04 02 23	393	256	88	11
25	1991 11 08 06:47	11 10 19	392	311	87	17
26	2001 04 11 13:43	04 12 19	384	211	63	26
27	1970 03 08 14:18	03 10 06	378	200	64	114
28	1991 07 08 16:36	07 10 14	376	189	63	185

SG: Geomagnetic storm of the gradual commencement type
C: Commencement before the end of the previous one
*: Overscaling on recording paper