Ion and electron drifts (earth's magnetic field)

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• CONTEXTO : Segundo ciclo universitário
• AREA: Física
• DISCIPLINA: Física e Tecnologia dos Plasmas
• ANO: 4
• LINGUA: en
• AUTOR: Vasco Guerra
• MATERIA PRINCIPAL: Single particle motion I
• DESCRICAO:
(F. F. Chen ~ 2.8) Suppose the earth's magnetic field is $$3\times10^{-5}$$ T at the equator and falls off as $$1/r^3$$ as in a perfect dipole. Let there be an isotropic population of 1 eV protons and 30 keV electrons, each with density $$n=10^7$$ m$$^{-3}$$ at $$r=5$$ earth radii in the equator plane.
(a) Compute the ion and electron $$\vec{\nabla} B$$ drift velocities.
(d) Compute the current ring density in A/m$$^2$$.