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Geomagnetic storm on 21 Sep 1957 (G3)

Max Kp7+G3

Ap74No. 15 in 1957

Consecutive G1+ days5

Ap rank364since 1932

Kp by 3-hour slot (UTC)

00–033-

03–062-

06–091+

09–127+

12–156o

15–187-

18–217-

21–247-

The days around it

Date	Max Kp	Ap	Level
18 Sep 1957	4-	12	–
19 Sep 1957	2-	4	–
20 Sep 1957	2+	6	–
21 Sep 1957	7+	74	G3
22 Sep 1957	8+	104	G4
23 Sep 1957	9-	164	G5
24 Sep 1957	5+	33	G1

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.

← 13 Sep 1957 22 Sep 1957 →

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Max Kp 7+, Ap 74: No. 364 of 34,615 days since 1932 by Ap.