Home › Geomagnetic history › 1985

Geomagnetic storm on 21 Apr 1985 (G4)

Max Kp8+G4

Ap103No. 1 in 1985

Consecutive G1+ days3

Ap rank155since 1932

Kp by 3-hour slot (UTC)

00–038+

03–067+

06–098o

09–126-

12–155-

15–186-

18–214+

21–244-

The days around it

Date	Max Kp	Ap	Level
18 Apr 1985	3-	4	–
19 Apr 1985	5o	21	G1
20 Apr 1985	7-	53	G3
21 Apr 1985	8+	103	G4
22 Apr 1985	4-	11	–
23 Apr 1985	4-	12	–
24 Apr 1985	4+	17	–

Highest-Ap days of 1985

21 Apr 1985103

5 Oct 198566

28 Apr 198561

28 Feb 198560

28 Jan 198558

20 Apr 198553

30 Nov 198552

12 Jul 198548

9 Jan 198546

6 Feb 198546

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.

← 20 Apr 1985 28 Apr 1985 →

About this page

Max Kp 8+, Ap 103: No. 155 of 34,615 days since 1932 by Ap.