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Geomagnetic storm on 15 Sep 1974 (G4)

Max Kp8-G4

Ap73No. 6 in 1974

Consecutive G1+ days2

Ap rank381since 1932

Kp by 3-hour slot (UTC)

00–031+

03–062-

06–091+

09–123-

12–157+

15–188-

18–217+

21–246-

The days around it

Date	Max Kp	Ap	Level
12 Sep 1974	3+	6	–
13 Sep 1974	4+	16	–
14 Sep 1974	4o	9	–
15 Sep 1974	8-	73	G4
16 Sep 1974	8o	88	G4
17 Sep 1974	2+	3	–
18 Sep 1974	6-	19	G2

Highest-Ap days of 1974

6 Jul 1974130

16 Sep 197488

13 Oct 197486

23 Jul 197482

5 Jul 197474

15 Sep 197473

12 Nov 197470

21 Mar 197468

16 Oct 197468

27 Jun 197454

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.

← 23 Jul 1974 16 Sep 1974 →

About this page

Max Kp 8-, Ap 73: No. 381 of 34,615 days since 1932 by Ap.