Our sun’s activity is on a maximum once every 11 years or so, often called the Solar Max. During that time the number of sunspots and CME’s are usually high, creating a lot of auroras. Halfway through that cycle there will be solar min, when most aurora action results from coronal holes. During that time the kp-values are commonly low.
Imagine your own energy level during 24 hours. You may get up in the morning and at some point in the day you are most active. Later, while sleeping, your activity level will tend to be at a minimum.
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