Top 100 days by Ap since 1932

13 Nov 1960280

11 May 2024271

13 Mar 1989246

1 Apr 1960241

15 Jul 1959236

18 Sep 1941232

5 Jul 1941222

28 Mar 1946213

1 Mar 1941207

29 Oct 2003204

6 Oct 1960203

8 Feb 1986202

8 Jul 1958200

11 Feb 1958199

6 Sep 1982199

#	Date	Max Kp	Ap
1	13 Nov 1960	9o	280
2	11 May 2024	9o	271
3	13 Mar 1989	9o	246
4	1 Apr 1960	9-	241
5	15 Jul 1959	9o	236
6	18 Sep 1941	9-	232
7	5 Jul 1941	9o	222
8	28 Mar 1946	9-	213
9	1 Mar 1941	9o	207
10	29 Oct 2003	9o	204
11	6 Oct 1960	9-	203
12	8 Feb 1986	9o	202
13	8 Jul 1958	9o	200
14	11 Feb 1958	9o	199
15	6 Sep 1982	9-	199
16	22 Sep 1946	9o	198
17	5 Jun 1991	9-	196
18	25 Mar 1946	9-	195
19	31 Mar 2001	9-	192
20	30 Oct 2003	9o	191
21	30 Mar 1940	9-	189
22	24 Mar 1940	9o	187
23	7 Oct 1960	9o	186
24	27 Jul 2004	9-	186
25	25 Mar 1940	9-	184
26	5 Aug 1972	9-	182
27	10 May 1992	9-	179
28	27 Mar 1959	8+	178
29	19 Sep 1941	9o	176
30	30 Apr 1960	9o	174
31	27 Apr 1956	9-	172
32	23 Sep 1957	9-	164
33	15 Jul 2000	9o	164
34	24 Mar 1991	9-	161
35	10 Nov 2004	9-	161
36	13 Sep 1957	9-	160
37	14 Mar 1989	9o	158
38	25 Jan 1949	9-	156
39	15 Oct 1949	8+	156
40	16 May 1956	8+	156
41	25 Jul 2004	8o	154
42	12 May 1949	9-	153
43	14 Jul 1982	9o	153
44	27 Jul 1946	9o	152
45	30 Jun 1957	8+	150
46	20 Nov 2003	9-	150
47	8 Mar 1970	9o	149
48	23 Sep 1946	8o	146
49	8 Aug 1948	8-	146
50	26 May 1967	9o	146
51	21 Oct 1989	8+	146
52	4 Sep 1957	9o	145
53	26 Mar 1976	8o	145
54	13 Jul 1982	9o	144
55	27 Aug 1998	8o	144
56	20 Jan 2026	8-	144
57	5 Feb 1983	8o	143
58	6 Nov 2001	9-	142
59	31 Aug 1943	8+	140
60	15 Mar 1948	8+	140
61	8 Nov 2004	9-	140
62	29 Sep 1957	9-	139
63	12 Nov 2025	9-	137
64	16 Apr 1938	9o	136
65	18 Sep 1946	8-	136
66	19 Aug 1950	8+	136
67	17 Apr 1939	8o	135
68	3 Sep 1957	9-	135
69	22 Sep 1982	8+	135
70	25 Jul 1981	8+	134
71	13 Jul 1991	9-	134
72	22 Aug 1939	8-	133
73	2 Mar 1957	8+	132
74	4 Aug 1972	9o	132
75	4 Sep 1958	9-	131
76	15 May 1969	8-	131
77	16 Aug 1959	8+	130
78	25 May 1967	9o	130
79	6 Jul 1974	9-	130
80	25 Mar 1991	9-	130
81	31 Mar 1960	8+	129
82	28 Apr 1937	8o	128
83	22 Jan 1938	8+	128
84	31 Mar 1940	8+	128
85	3 Mar 1947	8+	128
86	8 May 1960	8+	128
87	28 Oct 1961	9-	128
88	29 Oct 1991	8+	128
89	7 Feb 1946	8+	127
90	12 Aug 2024	8o	127
91	25 Jun 1940	8+	126
92	22 Sep 1963	9-	126
93	18 Jun 1972	8+	126
94	25 Apr 1979	8o	126
95	28 Aug 1978	8+	124
96	10 Apr 1990	8o	124
97	12 Aug 2000	8-	123
98	1 Nov 1968	8+	122
99	13 Apr 1981	8+	121
100	17 Jan 1938	8+	120

Dates and time slots are UTC. Kp is the 3-hourly planetary geomagnetic index (0–9); Ap is the daily average disturbance. G1–G5 follow the NOAA storm scale (Kp 5- and above counted as G1). Aurora visibility also depends on weather and location. The latest values are preliminary.