Aurora & Space WeatherHome › Geomagnetic history › 1999
Geomagnetic activity in March 1999
Mean Ap13.5No. 462 of 1138
G1+ days9
G3+ days0
Max Ap411 Mar 1999
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Mar 1999 | 6- | 41 | G2 |
| 2 Mar 1999 | 6- | 22 | G2 |
| 3 Mar 1999 | 5- | 16 | G1 |
| 4 Mar 1999 | 5o | 30 | G1 |
| 5 Mar 1999 | 5- | 16 | G1 |
| 6 Mar 1999 | 5- | 13 | G1 |
| 7 Mar 1999 | 5- | 22 | G1 |
| 10 Mar 1999 | 6+ | 34 | G2 |
| 29 Mar 1999 | 6- | 28 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| March 1998 | 12.7 | 6 | 1 |
| March 1999 | 13.5 | 9 | 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 13.5 in March 1999, No. 462 of 1138 months since 1932; 9 days reached G1 or higher.