Aurora & Space WeatherGeomagnetic activity in 1975
Mean Ap13.9
G1+91days
G3+6days
G50days
G1+ days by month
- January 1975
- February 1975
- March 1975
- April 1975
- May 1975
- June 1975
- July 1975
- August 1975
- September 1975
- October 1975
- November 1975
- December 1975
Nearby years (G1+ days)
60
65
67
116
147
91
72
66
111
88
58
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 10 Mar 1975 | 7o | 80 | G3 |
| 3 Nov 1975 | 6o | 65 | G2 |
| 11 Mar 1975 | 7- | 53 | G3 |
| 9 Apr 1975 | 6o | 52 | G2 |
| 22 Nov 1975 | 6+ | 50 | G2 |
| 8 Oct 1975 | 7- | 45 | G3 |
| 7 Jan 1975 | 8- | 44 | G4 |
| 4 Nov 1975 | 5+ | 41 | G1 |
| 10 Feb 1975 | 6- | 38 | G2 |
| 28 Mar 1975 | 6o | 38 | G2 |
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.
About this page
1975 had 91 G1+ storm days (No. 36 of 95 years) and 6 G3+ days.