Geomagnetic activity

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    Natural variations in the geomagnetic field classified quantitatively into quiet, unsettled, active, and geomagnetic storm levels according to the observed a index:
    quiet 0 – 7
    unsettled 8 – 15
    active 16 – 29
    minor storm 30 – 49
    major storm 50 – 99
    severe storm 100 – 400

    Categories: Propagation
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