Aurora & Space WeatherGeomagnetic activity in 1977
Mean Ap11.9
G1+66days
G3+8days
G50days
G1+ days by month
- January 1977
- February 1977
- March 1977
- April 1977
- May 1977
- June 1977
- July 1977
- August 1977
- September 1977
- October 1977
- November 1977
- December 1977
Nearby years (G1+ days)
67
116
147
91
72
66
111
88
58
97
159
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Dec 1977 | 7o | 69 | G3 |
| 2 May 1977 | 6+ | 66 | G2 |
| 21 Sep 1977 | 7+ | 64 | G3 |
| 22 Sep 1977 | 7- | 63 | G3 |
| 27 Oct 1977 | 7- | 62 | G3 |
| 29 Jul 1977 | 7- | 61 | G3 |
| 6 Apr 1977 | 7o | 49 | G3 |
| 7 Apr 1977 | 7- | 48 | G3 |
| 19 Apr 1977 | 6+ | 48 | G2 |
| 28 Oct 1977 | 7+ | 47 | 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
1977 had 66 G1+ storm days (No. 53 of 95 years) and 8 G3+ days.