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Geomagnetic activity in July 2009
Mean Ap4.4No. 1117 of 1138
G1+ days1
G3+ days0
Max Ap2422 Jul 2009
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 22 Jul 2009 | 6- | 24 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| July 2008 | 5.4 | 0 | 0 |
| July 2009 | 4.4 | 1 | 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 4.4 in July 2009, No. 1117 of 1138 months since 1932; 1 days reached G1 or higher.