1999Year 3 of solar cycle 23

Geomagnetic storms of 1999

1999 had 57 geomagnetic storms reaching Kp 5 or more, 6 of them strong (G3 or above); the strongest reached Kp 8. Every storm with its dates, and the Kp of every day of the year.

57Every storm

6G3–G5

Kp 8Peak Kp

77days at Kp 5 or more

The year day by day

the day's highest Kp

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Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Kp 0–3Kp 4Kp 5 · G1Kp 6 · G2Kp 7 · G3Kp 8 · G4Kp 9 · G5

Every storm · 1999

3Jan

3Feb

4Mar

3Apr

2May

2Jun

5Jul

8Aug

7Sep

8Oct

8Nov

4Dec

Date	Level	Peak Kp	Hours at Kp 5 or more	ap
13 – 14 January 1999	G3	Kp 7	15	132
15 January 1999	G1	Kp 5−	3	39
23 January 1999	G1	Kp 5	3	48
17 February 1999	G1	Kp 5	3	48
18 – 19 February 1999	G3	Kp 7−	36	111
28 February – 2 March 1999	G2	Kp 6−	21	67
3 – 5 March 1999	G1	Kp 5	15	48
6 – 7 March 1999	G1	Kp 5−	6	39
10 March 1999	G2	Kp 6+	12	94
29 March 1999	G2	Kp 6−	3	67
16 – 17 April 1999	G3	Kp 7+	15	154
28 April 1999	G1	Kp 5−	3	39
29 April 1999	G1	Kp 5−	3	39
13 May 1999	G1	Kp 5	9	48
18 May 1999	G1	Kp 5	3	48
26 June 1999	G1	Kp 5−	3	39
27 – 28 June 1999	G2	Kp 6	12	80
2 July 1999	G1	Kp 5	3	48
21 July 1999	G1	Kp 5−	6	39
22 July 1999	G1	Kp 5−	3	39
30 – 31 July 1999	G4	Kp 8−	18	179
31 July 1999	G1	Kp 5+	6	56
15 August 1999	G1	Kp 5−	3	39
16 – 17 August 1999	G1	Kp 5+	21	56
18 August 1999	G1	Kp 5	6	48
20 August 1999	G2	Kp 6−	12	67
23 August 1999	G2	Kp 6−	6	67
24 August 1999	G2	Kp 6−	3	67
30 August 1999	G1	Kp 5	3	48
31 August 1999	G1	Kp 5	6	48
12 – 14 September 1999	G2	Kp 6	27	80
15 September 1999	G2	Kp 6−	6	67
16 September 1999	G2	Kp 6	6	80
22 – 23 September 1999	G4	Kp 8	15	207
26 – 28 September 1999	G2	Kp 6−	27	67
28 – 29 September 1999	G1	Kp 5−	6	39
30 September 1999	G1	Kp 5+	6	56
10 October 1999	G2	Kp 6−	9	67
11 – 13 October 1999	G1	Kp 5+	30	56
14 – 16 October 1999	G1	Kp 5	21	48
17 October 1999	G1	Kp 5−	3	39
21 October 1999	G1	Kp 5	3	48
21 – 24 October 1999	G4	Kp 8	33	207
27 October 1999	G1	Kp 5−	3	39
28 October 1999	G1	Kp 5+	3	56
7 November 1999	G1	Kp 5	9	48
8 November 1999	G1	Kp 5−	6	39
9 November 1999	G1	Kp 5−	3	39
11 November 1999	G1	Kp 5−	3	39
13 November 1999	G2	Kp 6+	12	94
23 November 1999	G1	Kp 5−	3	39
24 November 1999	G1	Kp 5	3	48
25 November 1999	G1	Kp 5−	3	39
4 December 1999	G1	Kp 5	6	48
13 December 1999	G2	Kp 6−	6	67
31 December 1999	G2	Kp 6−	3	67
31 December 1999 – 1 January 2000	G1	Kp 5+	12	56