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Update skindepth.rst #563

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Update skindepth.rst
PAULGOYES Oct 10, 2020
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Update MT_N_layered_Earth.rst
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2 changes: 1 addition & 1 deletion content/maxwell1_fundamentals/harmonic_planewaves_homogeneous/skindepth.rst
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Expand Up @@ -18,7 +18,7 @@ Attenuation defines the rate of amplitude loss an EM wave experiences at it prop
.. _harmonic_planewaves_homogeneous_attenuation_formula:

.. math::
A(z) = A_0 e^{\beta z}
A(z) = A_0 e^{-\beta z}
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must be minus in order to attenuate the amplitude.

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If it is positive, the "z" values must be negative. I think we can clarify this in some sentences. For example "z subsurface is between zero and -infinity". That is because, in several books, the "z" is positive, thus, the beta value in the amplitude equation must be with a minus.


where absolute :math:`A` is the amplitude, :math:`A_0` is the absolute amplitude at :math:`z` = 0 m and:

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