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Geomagnetic activity in May 2011
Mean Ap9.0No. 845 of 1138
G1+ days2
G3+ days0
Max Ap4528 May 2011
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 28 May 2011 | 6+ | 45 | G2 |
| 29 May 2011 | 5+ | 34 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| May 2010 | 8.1 | 4 | 0 |
| May 2011 | 9.0 | 2 | 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 9.0 in May 2011, No. 845 of 1138 months since 1932; 2 days reached G1 or higher.