On the modifications of the whistler mode instability in the magnetosphere in the presence of parallel electric field by cold plasma injection

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<jats:p>Dispersion relation for the whistler mode waves in an anisotropic warm magnetoplasma in the presence of a parallel electric field has been derived. The modifications in the whistler mode instability produced by cold plasma injection to an infinite uniform anisotropic plasma (<jats:italic>A</jats:italic> <1) in the presence of a parallel electric field have been studied. This study has been performed with the plasma parameters similar to those observed in the equatorial magnetosphere at 6.6 <jats:italic>R<jats:sub>E</jats:sub></jats:italic>. The electric field is found to have pronounced effect for small values of <jats:italic>n<jats:sub>c</jats:sub>/n<jats:sub>w</jats:sub></jats:italic> and extends the range of instability in <jats:italic>k</jats:italic> space toward higher wavelengths. The cold plasma injection increases the range of instability in <jats:italic>k</jats:italic> space toward lower wave lengths. The effects of electric field seem to be insignificant for large values of <jats:italic>n<jats:sub>c</jats:sub>/n<jats:sub>w</jats:sub></jats:italic>.</jats:p>

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