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Geomagnetic activity in April 2004
Mean Ap11.1No. 658 of 1138
G1+ days6
G3+ days0
Max Ap413 Apr 2004
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 3 Apr 2004 | 6+ | 41 | G2 |
| 4 Apr 2004 | 6+ | 18 | G2 |
| 5 Apr 2004 | 6+ | 24 | G2 |
| 6 Apr 2004 | 5o | 25 | G1 |
| 9 Apr 2004 | 5- | 16 | G1 |
| 30 Apr 2004 | 5- | 16 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 2003 | 20.2 | 13 | 0 |
| April 2004 | 11.1 | 6 | 0 |
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 11.1 in April 2004, No. 658 of 1138 months since 1932; 6 days reached G1 or higher.