Guide KP-INDEX figure ranges from 0 to 9 and provides a good indicator of viewing the Aurora Borealis or Northern Lights The greater the KP-Index is, the higher is the probability of viewing. The estimated 3-hour Planetary Kp-index data is collected from ground-based magnetometers.
Guide A-INDEX is an indicator of possible enhanced VHF radio signal communication at a range of up to 1000 miles or more. During strong solar activity, the enhanced auroral ionization, acts as a cloud which backscatters the frequencies from 28 to 433MHZ or higher, making this range possible at mid to high latitudes.
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