Ion and electron drifts (earth's magnetic field)
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Metadata
- 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:
- DIFICULDADE: *
- TEMPO MEDIO DE RESOLUCAO: 300 [s]
- TEMPO MAXIMO DE RESOLUCAO: 600 [s]
- PALAVRAS CHAVE:
(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.
(b) Does an electron drift eastward or westward?
(c) How long does an electron take to encircle the earth?
(d) Compute the current ring density in A/m\(^2\).