Title: Alfvén Wave Parallel Electric Field in the Dipole Model of the Magnetosphere: Gyrokinetic Treatment
Abstract: Abstract A mechanism for generation of the parallel electric field by Alfvén wave in the dipole model of the magnetosphere in full gyrokinetics is proposed. The parallel electric field of the Alfvén mode is caused by the coupling of the Alfvén and electrostatic modes due to the plasma inhomogeneity and field line curvature in presence of the trapped hot electrons. The parallel electric field is described by an inhomogeneous integral equation arising from the averaging of the bounce motion of hot electrons. It was found that the parallel electric field is localized near the ionosphere at the heights below 0.5 Earth's radius. For typical Alfvén wave amplitudes observed in space, the parallel electric field potential reaches the values of several kV, which can provide enough acceleration for the precipitating auroral electrons.
Publication Year: 2021
Publication Date: 2021-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 13
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