Aurora & Space WeatherGeomagnetic activity in 1947
Mean Ap18.8
G1+111days
G3+25days
G51days
G1+ days by month
- January 1947
- February 1947
- March 1947
- April 1947
- May 1947
- June 1947
- July 1947
- August 1947
- September 1947
- October 1947
- November 1947
- December 1947
Nearby years (G1+ days)
92
128
64
59
102
111
94
92
123
164
150
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 3 Mar 1947 | 8+ | 128 | G4 |
| 17 Apr 1947 | 9- | 100 | G5 |
| 25 Sep 1947 | 8- | 100 | G4 |
| 8 Mar 1947 | 8- | 90 | G4 |
| 24 Sep 1947 | 7+ | 90 | G3 |
| 3 Sep 1947 | 7+ | 84 | G3 |
| 4 Mar 1947 | 7+ | 82 | G3 |
| 2 Mar 1947 | 7o | 81 | G3 |
| 18 Jul 1947 | 7- | 80 | G3 |
| 28 Mar 1947 | 7- | 75 | G3 |
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
1947 had 111 G1+ storm days (No. 19 of 95 years) and 25 G3+ days.