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Geomagnetic activity in April 2011
Mean Ap8.7No. 876 of 1138
G1+ days5
G3+ days0
Max Ap266 Apr 2011
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 6 Apr 2011 | 5o | 26 | G1 |
| 12 Apr 2011 | 5o | 23 | G1 |
| 20 Apr 2011 | 5o | 16 | G1 |
| 29 Apr 2011 | 5+ | 12 | G1 |
| 30 Apr 2011 | 5- | 26 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 2010 | 10.3 | 4 | 1 |
| April 2011 | 8.7 | 5 | 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 8.7 in April 2011, No. 876 of 1138 months since 1932; 5 days reached G1 or higher.