Propagation at Extremely Low Frequencies (Dana Porrat)

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    PropagaionDirection of

    z=h

    z

    z=0

    source

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    0 10 20 30 40 50 600.2

    0.4

    0.6

    0.8

    1

    1.2

    1.4

    1.6

    1.8

    2

    Frequency (Hz)

    N

    SMagneticField

    (pT/H

    z)

    Schumann Resonance

    Santa Cruz, California

    1921 UT, 13 July 1998

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    0

    gg0

    ii

    r

    r=a+h

    r=a

    source

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    directionIncident wave Field

    Geomagnetic

    r

    r=a

    r=a+h

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