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Geomagnetic activity in June 1999
Mean Ap7.1No. 994 of 1138
G1+ days3
G3+ days0
Max Ap2628 Jun 1999
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 26 Jun 1999 | 5- | 18 | G1 |
| 27 Jun 1999 | 5+ | 25 | G1 |
| 28 Jun 1999 | 6o | 26 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| June 1998 | 9.8 | 3 | 0 |
| June 1999 | 7.1 | 3 | 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 7.1 in June 1999, No. 994 of 1138 months since 1932; 3 days reached G1 or higher.