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Geomagnetic storm on 17 Jul 1947 (G4)

Max Kp8oG4

Ap68No. 13 in 1947

Consecutive G1+ days4

Ap rank438since 1932

Kp by 3-hour slot (UTC)

00–031o

03–061-

06–091-

09–122o

12–151+

15–187o

18–218o

21–248-

The days around it

Date	Max Kp	Ap	Level
14 Jul 1947	3-	6	–
15 Jul 1947	3o	8	–
16 Jul 1947	3+	5	–
17 Jul 1947	8o	68	G4
18 Jul 1947	7-	80	G3
19 Jul 1947	5+	28	G1
20 Jul 1947	5+	30	G1

Highest-Ap days of 1947

3 Mar 1947128

17 Apr 1947100

25 Sep 1947100

8 Mar 194790

24 Sep 194790

3 Sep 194784

4 Mar 194782

2 Mar 194781

18 Jul 194780

28 Mar 194775

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.

← 14 Jun 1947 18 Jul 1947 →

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Max Kp 8o, Ap 68: No. 438 of 34,615 days since 1932 by Ap.