Aurora & Space WeatherGeomagnetic activity in 1998
Mean Ap12.0
G1+54days
G3+12days
G51days
G1+ days by month
- January 1998
- February 1998
- March 1998
- April 1998
- May 1998
- June 1998
- July 1998
- August 1998
- September 1998
- October 1998
- November 1998
- December 1998
Nearby years (G1+ days)
108
125
100
41
43
54
77
83
63
74
158
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 27 Aug 1998 | 8o | 144 | G4 |
| 25 Sep 1998 | 8+ | 117 | G4 |
| 4 May 1998 | 9- | 101 | G5 |
| 9 Nov 1998 | 7- | 75 | G3 |
| 8 Nov 1998 | 8- | 66 | G4 |
| 6 Aug 1998 | 7+ | 64 | G3 |
| 13 Nov 1998 | 6o | 64 | G2 |
| 2 May 1998 | 7- | 63 | G3 |
| 3 May 1998 | 6o | 62 | G2 |
| 19 Oct 1998 | 7- | 62 | G3 |
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
1998 had 54 G1+ storm days (No. 70 of 95 years) and 12 G3+ days.