Plasma parameters

Plasma Parameters

Plasma parameters

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Description:
Plasma parameters define various characteristics of a plasma, an electrically conductive collection of charged particles that responds collectively to electromagnetic forces. Plasma typically takes the form of neutral gas-like clouds or charged ion beams, but may also include dust and grains. Peratt, Anthony, Physics of the Plasma Universe (1992);

Fundamental plasma parameters

All quantities are in Gaussian cgs units except temperature expressed in eV and ion mass expressed in units of the proton mass <math>mu = m_i/m_p</math>; Z is charge state; k is Boltzmann's constant; K is wavelength; γ is the adiabatic index; ln Λ is the Coulomb logarithm.

Frequencies

  • electron gyrofrequency, the angular frequency of the circular motion of an electron in the plane perpendicular to the magnetic field:
<math>omega_ = eB/m_ec = 1.76 times 10^7 B mbox ,</math>
  • ion gyrofrequency, the angular frequency of the circular motion of an ion in the plane perpendicular to the magnetic field:
<math>omega_ = eB/m_ic = 9.58 times 10^3 Z mu^ B mbox ,</math>
  • electron plasma frequency, the frequency with which electrons oscillate (plasma oscillation):
<math>omega_ = (4pi n_ee^2/m_e)^ = 5.64 times 10^4 n_e^ mbox</math>

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