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Geomagnetic storm on 12 May 1959 (G4)

Max Kp8+G4

Ap108No. 7 in 1959

Consecutive G1+ days2

Ap rank136since 1932

Kp by 3-hour slot (UTC)

00–037o

03–067-

06–097-

09–126-

12–157-

15–188+

18–215+

21–245-

The days around it

Date	Max Kp	Ap	Level
9 May 1959	4-	16	–
10 May 1959	4-	14	–
11 May 1959	6o	26	G2
12 May 1959	8+	108	G4
13 May 1959	4-	14	–
14 May 1959	3-	5	–
15 May 1959	5+	33	G1

Highest-Ap days of 1959

15 Jul 1959236

27 Mar 1959178

16 Aug 1959130

18 Jul 1959119

17 Aug 1959114

17 Jul 1959110

12 May 1959108

4 Sep 1959103

10 Apr 195998

28 Mar 195987

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.

← 23 Apr 1959 24 May 1959 →

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Max Kp 8+, Ap 108: No. 136 of 34,615 days since 1932 by Ap.