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Geomagnetic activity in August 2004
Mean Ap9.3No. 818 of 1138
G1+ days2
G3+ days1
Max Ap4230 Aug 2004
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 30 Aug 2004 | 7o | 42 | G3 |
| 31 Aug 2004 | 5+ | 28 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| August 2003 | 23.0 | 15 | 2 |
| August 2004 | 9.3 | 2 | 1 |
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
Mean Ap 9.3 in August 2004, No. 818 of 1138 months since 1932; 2 days reached G1 or higher.