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Geomagnetic storm on 30 Sep 2025 (G3)

Max Kp7oG3

Ap74No. 5 in 2025

Consecutive G1+ days5

Ap rank373since 1932

Kp by 3-hour slot (UTC)

00–035o

03–067o

06–096o

09–125o

12–156-

15–186-

18–216+

21–245+

The days around it

Date	Max Kp	Ap	Level
27 Sep 2025	2+	5	–
28 Sep 2025	3o	9	–
29 Sep 2025	5+	28	G1
30 Sep 2025	7o	74	G3
1 Oct 2025	6+	47	G2
2 Oct 2025	7-	45	G3
3 Oct 2025	5o	28	G1

Highest-Ap days of 2025

12 Nov 2025137

1 Jun 202598

1 Jan 202581

16 Apr 202575

30 Sep 202574

2 Jun 202569

13 Jun 202569

29 May 202562

3 Jun 202560

13 Nov 202557

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.

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About this page

Max Kp 7o, Ap 74: No. 373 of 34,615 days since 1932 by Ap.