Electrotastic wave excitation in planetary magnetospheres: Application to Neptune

Physics

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Cyclotron Frequency, Electrostatic Waves, Neptune (Planet), Nitrogen Ions, Planetary Magnetospheres, Triton, Wave Excitation, Electrons, Flux (Rate), Mathematical Models, Voyager 2 Spacecraft

Scientific paper

Voyager 2 observations of electrostatic electron and ion harmonic waves in Neptune's magnetosphere are addressed. A model of electron Bernstein modes generated by a loss cone distribution of superthermal electrons is scaled to Neptune parameters and a comparison of theory with the observed electron flux shows good agreement. A model of proton Bernstein modes generated by a ring distribution of Tritonogenic nitrogen ions is also investigated and satisfactory agreement with the data are obtained compatible with known properties of the magnetosphere. The success of the model in accounting for electrostatic emission observed by Voyager over a wide range of sampled parameters recommends its general applicability to planetary magnetospheres.

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