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Geomagnetic storm on 17 Apr 1957 (G4)

Max Kp8-G4

Ap55No. 25 in 1957

Consecutive G1+ days3

Ap rank725since 1932

Kp by 3-hour slot (UTC)

00–033+

03–064o

06–093+

09–124+

12–155+

15–184o

18–216o

21–248-

The days around it

Date	Max Kp	Ap	Level
14 Apr 1957	2o	4	–
15 Apr 1957	6-	18	G2
16 Apr 1957	4+	17	–
17 Apr 1957	8-	55	G4
18 Apr 1957	6+	42	G2
19 Apr 1957	7-	60	G3
20 Apr 1957	4o	14	–

Highest-Ap days of 1957

23 Sep 1957164

13 Sep 1957160

30 Jun 1957150

4 Sep 1957145

29 Sep 1957139

3 Sep 1957135

2 Mar 1957132

5 Sep 1957112

22 Sep 1957104

2 Sep 1957102

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.

← 10 Apr 1957 19 Apr 1957 →

About this page

Max Kp 8-, Ap 55: No. 725 of 34,615 days since 1932 by Ap.