Aurora & Space WeatherGeomagnetic activity in 2009
Mean Ap3.9
G1+4days
G3+0days
G50days
G1+ days by month
- January 2009
- February 2009
- March 2009
- April 2009
- May 2009
- June 2009
- July 2009
- August 2009
- September 2009
- October 2009
- November 2009
- December 2009
Nearby years (G1+ days)
60
77
40
29
16
4
15
34
52
30
23
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 22 Jul 2009 | 6- | 24 | G2 |
| 30 Aug 2009 | 6- | 20 | G2 |
| 14 Feb 2009 | 4+ | 17 | – |
| 13 Mar 2009 | 5- | 17 | G1 |
| 24 Jun 2009 | 5o | 16 | G1 |
| 4 Feb 2009 | 4- | 14 | – |
| 22 Oct 2009 | 4- | 13 | – |
| 9 Apr 2009 | 3+ | 12 | – |
| 3 Jan 2009 | 4- | 11 | – |
| 26 Jan 2009 | 3+ | 11 | – |
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
2009 had 4 G1+ storm days (No. 95 of 95 years) and 0 G3+ days.