Aurora & Space WeatherGeomagnetic activity in 2004
Mean Ap13.4
G1+60days
G3+10days
G54days
G1+ days by month
- January 2004
- February 2004
- March 2004
- April 2004
- May 2004
- June 2004
- July 2004
- August 2004
- September 2004
- October 2004
- November 2004
- December 2004
Nearby years (G1+ days)
77
83
63
74
158
60
77
40
29
16
4
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 27 Jul 2004 | 9- | 186 | G5 |
| 10 Nov 2004 | 9- | 161 | G5 |
| 25 Jul 2004 | 8o | 154 | G4 |
| 8 Nov 2004 | 9- | 140 | G5 |
| 9 Nov 2004 | 9- | 119 | G5 |
| 22 Jan 2004 | 7o | 64 | G3 |
| 23 Jul 2004 | 6o | 52 | G2 |
| 7 Nov 2004 | 8o | 50 | G4 |
| 26 Jul 2004 | 7+ | 47 | G3 |
| 10 Mar 2004 | 6+ | 45 | 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
2004 had 60 G1+ storm days (No. 62 of 95 years) and 10 G3+ days.