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Geomagnetic activity in July 1947
Mean Ap16.0No. 299 of 1138
G1+ days5
G3+ days2
Max Ap8018 Jul 1947
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 17 Jul 1947 | 8o | 68 | G4 |
| 18 Jul 1947 | 7- | 80 | G3 |
| 19 Jul 1947 | 5+ | 28 | G1 |
| 20 Jul 1947 | 5+ | 30 | G1 |
| 27 Jul 1947 | 5- | 20 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| July 1946 | 22.0 | 13 | 3 |
| July 1947 | 16.0 | 5 | 2 |
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 16.0 in July 1947, No. 299 of 1138 months since 1932; 5 days reached G1 or higher.