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Geomagnetic activity in April 2005
Mean Ap10.9No. 671 of 1138
G1+ days6
G3+ days1
Max Ap505 Apr 2005
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Apr 2005 | 6o | 26 | G2 |
| 5 Apr 2005 | 7o | 50 | G3 |
| 12 Apr 2005 | 5o | 30 | G1 |
| 13 Apr 2005 | 5o | 30 | G1 |
| 20 Apr 2005 | 5- | 20 | G1 |
| 30 Apr 2005 | 5o | 24 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 2004 | 11.1 | 6 | 0 |
| April 2005 | 10.9 | 6 | 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 10.9 in April 2005, No. 671 of 1138 months since 1932; 6 days reached G1 or higher.