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Geomagnetic storm on 18 Feb 1999 (G3)

Max Kp7-G3

Ap80No. 2 in 1999

Consecutive G1+ days3

Ap rank307since 1932

Kp by 3-hour slot (UTC)

00–035-

03–066o

06–097-

09–127-

12–157-

15–185+

18–216o

21–245o

The days around it

Date	Max Kp	Ap	Level
15 Feb 1999	4o	15	–
16 Feb 1999	2o	4	–
17 Feb 1999	5o	17	G1
18 Feb 1999	7-	80	G3
19 Feb 1999	6-	40	G2
20 Feb 1999	2+	3	–
21 Feb 1999	3-	4	–

Highest-Ap days of 1999

22 Oct 199991

18 Feb 199980

30 Jul 199953

22 Sep 199950

17 Apr 199947

13 Sep 199946

12 Oct 199946

27 Sep 199943

13 Nov 199943

1 Mar 199941

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.

← 13 Jan 1999 17 Apr 1999 →

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Max Kp 7-, Ap 80: No. 307 of 34,615 days since 1932 by Ap.