Aurora & Space WeatherGeomagnetic activity in 1973
Mean Ap17.0
G1+116days
G3+13days
G50days
G1+ days by month
- January 1973
- February 1973
- March 1973
- April 1973
- May 1973
- June 1973
- July 1973
- August 1973
- September 1973
- October 1973
- November 1973
- December 1973
Nearby years (G1+ days)
74
52
60
65
67
116
147
91
72
66
111
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Apr 1973 | 8+ | 91 | G4 |
| 29 Oct 1973 | 7o | 86 | G3 |
| 19 Mar 1973 | 7o | 82 | G3 |
| 20 Mar 1973 | 7- | 80 | G3 |
| 14 May 1973 | 8- | 80 | G4 |
| 23 Sep 1973 | 7o | 63 | G3 |
| 16 Apr 1973 | 6+ | 60 | G2 |
| 29 Apr 1973 | 6o | 59 | G2 |
| 21 Mar 1973 | 6o | 58 | G2 |
| 14 Apr 1973 | 8- | 57 | G4 |
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
1973 had 116 G1+ storm days (No. 18 of 95 years) and 13 G3+ days.