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Ke

10

100

Frequency in Kilocycles

Ve

FIGURE 15. Variation of K, and 4. with frequency for various conductivities.

1000

10-6

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FIGURE 16.

10

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Phase of Parameter Y(P), Radians

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Numerical Distance 1p,l, Radians

Variation of amplitude and phase of y (p) with numerical distance p at various conductivities.

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FIGURE 17. Exponent, Im To, of attenuation factor exp[-Im 7] for first term (s=0) of residue series.

105

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Delay, 1, Microseconds

0.01

0.1

10

100

1000

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10.000

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FIGURE 19. Phase parameters Re To and arg f(To, 8.) at various frequencies.

T

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Velocity, v, Meters per Second

Distance From Source, Statute Miles

FIGURE 20. Phase velocity and group velocity of ground wave.

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