Aurora & Space WeatherHome › Geomagnetic history › 2005
Geomagnetic activity in May 2005
Mean Ap18.7No. 189 of 1138
G1+ days9
G3+ days3
Max Ap918 May 2005
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 May 2005 | 5- | 22 | G1 |
| 7 May 2005 | 5- | 10 | G1 |
| 8 May 2005 | 8+ | 91 | G4 |
| 13 May 2005 | 5- | 21 | G1 |
| 15 May 2005 | 8+ | 87 | G4 |
| 16 May 2005 | 6+ | 41 | G2 |
| 20 May 2005 | 5o | 23 | G1 |
| 29 May 2005 | 6- | 20 | G2 |
| 30 May 2005 | 8- | 90 | G4 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| May 2004 | 8.4 | 1 | 0 |
| May 2005 | 18.7 | 9 | 3 |
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 18.7 in May 2005, No. 189 of 1138 months since 1932; 9 days reached G1 or higher.