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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	C	796	462	412	148
2	1989 03 13 01:27	03 15 22	747	445	170	94
3	1958 07 08 07:48	07 10 11	565	244	69	165
4	1959 07 15 08:02	07 17 02	563	215	100	92
5	1958 02 11 01:26	02 13 06	557	>434*	248	50
6	1967 05 25 12:35	05 29 20	547	234	112	202
7	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
9	2003 10 29 06:11	C	513	407	99	112
10	1960 11 12 13:48	11 14 22	490	313	139	48
11	1991 03 24 03:41	03 27 18	>467*	298	138	>167*
12	2003 10 30 16:37	11 02 21	467	376	121	37
13	1960 04 30 12:14	05 02 20	454	207	68	141
14	2004 11 07 18:27	C	452	268	70	58
15	2001 03 31 00:52	04 01 15	451	368	102	30
16	2003 11 20 08:02	11 21 24	446	261	116	32
17	1957 09 13 00:46	09 14 19	434	252	118	26
18	1992 05 09 19:57	05 11 24	429	257	97	134
19	1981 07 25 13:23	07 27 18	418	184	66	122
20	2000 04 06 16:39	04 07 20	414	191	86	80
21	2005 05 15 02:38	05 16 18	403	202	90	49
22	1960 03 31 09:55	04 02 23	393	256	88	11
23	1991 11 08 06:47	11 10 19	392	311	87	17
24	2001 04 11 13:43	04 12 19	384	211	63	26
25	1970 03 08 14:18	03 10 06	378	200	64	114
26	1991 07 08 16:36	07 10 14h	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