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Geomagnetic storm on 21 Apr 1970 (G4)

Max Kp8+G4

Ap90No. 4 in 1970

Consecutive G1+ days6

Ap rank221since 1932

Kp by 3-hour slot (UTC)

00–034-

03–064o

06–095o

09–126-

12–156o

15–187-

18–218+

21–247o

The days around it

Date	Max Kp	Ap	Level
18 Apr 1970	5+	18	G1
19 Apr 1970	5o	21	G1
20 Apr 1970	5-	21	G1
21 Apr 1970	8+	90	G4
22 Apr 1970	7o	41	G3
23 Apr 1970	4-	14	–
24 Apr 1970	4-	16	–

Highest-Ap days of 1970

8 Mar 1970149

17 Aug 1970115

25 Jul 197092

21 Apr 197090

9 Jul 197087

14 Dec 197065

7 Nov 197058

31 Mar 197051

9 Mar 197047

28 May 197045

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.

← 8 Mar 1970 22 Apr 1970 →

About this page

Max Kp 8+, Ap 90: No. 221 of 34,615 days since 1932 by Ap.