Kp and ap are the average of K and an over 13 geomagnetic observatories to represent planetary-wide geomagnetic disturbances.
2.
Geomagnetic storming reached the G2 ( Kp = 6 ) level on NOAA's Space Weather Prediction Center scale of geomagnetic disturbances.
3.
AE index is compiled from geomagnetic disturbances at 12 geomagnetic observatories in and near the auroral zones and is recorded at 1-minute intervals.
4.
Kp / ap Index :'a'is an index created from the geomagnetic disturbance at one mid-latitude ( 40?to 50?latitude ) geomagnetic observatory during a 3-hour period .'K'is the quasi-logarithmic counterpart of the'a'index.
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