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Geomagnetic activity in March 1991
Mean Ap27.0No. 43 of 1138
G1+ days13
G3+ days4
Max Ap16124 Mar 1991
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 5 Mar 1991 | 5- | 22 | G1 |
| 6 Mar 1991 | 5o | 24 | G1 |
| 7 Mar 1991 | 5- | 24 | G1 |
| 9 Mar 1991 | 5- | 25 | G1 |
| 10 Mar 1991 | 6- | 21 | G2 |
| 13 Mar 1991 | 6+ | 27 | G2 |
| 21 Mar 1991 | 7- | 26 | G3 |
| 22 Mar 1991 | 5- | 20 | G1 |
| 24 Mar 1991 | 9- | 161 | G5 |
| 25 Mar 1991 | 9- | 130 | G5 |
| 26 Mar 1991 | 8o | 114 | G4 |
| 27 Mar 1991 | 5- | 31 | G1 |
| 30 Mar 1991 | 5- | 26 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| March 1990 | 23.3 | 15 | 4 |
| March 1991 | 27.0 | 13 | 4 |
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 27.0 in March 1991, No. 43 of 1138 months since 1932; 13 days reached G1 or higher.