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Geomagnetic activity in September 1948
Mean Ap14.9No. 363 of 1138
G1+ days12
G3+ days0
Max Ap371 Sep 1948
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Sep 1948 | 6o | 37 | G2 |
| 2 Sep 1948 | 5- | 24 | G1 |
| 4 Sep 1948 | 5+ | 24 | G1 |
| 7 Sep 1948 | 5o | 15 | G1 |
| 12 Sep 1948 | 5- | 20 | G1 |
| 15 Sep 1948 | 5+ | 16 | G1 |
| 16 Sep 1948 | 5o | 22 | G1 |
| 22 Sep 1948 | 5+ | 16 | G1 |
| 24 Sep 1948 | 5- | 23 | G1 |
| 25 Sep 1948 | 5o | 31 | G1 |
| 26 Sep 1948 | 5o | 23 | G1 |
| 29 Sep 1948 | 5+ | 28 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1947 | 32.2 | 16 | 4 |
| September 1948 | 14.9 | 12 | 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 14.9 in September 1948, No. 363 of 1138 months since 1932; 12 days reached G1 or higher.