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Geomagnetic storm on 13 Apr 1981 (G4)

Max Kp8+G4

Ap121No. 2 in 1981

Consecutive G1+ days4

Ap rank99since 1932

Kp by 3-hour slot (UTC)

00–038o

03–068+

06–098-

09–126-

12–156+

15–186-

18–216-

21–245o

The days around it

Date	Max Kp	Ap	Level
10 Apr 1981	3o	8	–
11 Apr 1981	6+	39	G2
12 Apr 1981	7o	96	G3
13 Apr 1981	8+	121	G4
14 Apr 1981	5o	27	G1
15 Apr 1981	3o	8	–
16 Apr 1981	4o	13	–

Highest-Ap days of 1981

25 Jul 1981134

13 Apr 1981121

12 Apr 198196

5 Mar 198181

26 Jul 198178

14 Oct 198173

22 Oct 198172

20 Oct 198167

26 Apr 198162

11 May 198161

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.

← 12 Apr 1981 26 Apr 1981 →

About this page

Max Kp 8+, Ap 121: No. 99 of 34,615 days since 1932 by Ap.