Electrostatic Approximation

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Valid for:

  • Short wavelength modes
  • B_1 \simeq 0
  • E_{\perp}<<E_{\parallel}
  • \nabla \cdot D = 0 \rightarrow k \cdot \epsilon \cdot k = 0 (homogenous)
  • k_x^2 S+k_z^2 P=0 for homogenous cold plasma.
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