Alfv'en waves in the magnetosphere generated by shock wave / plasmapause interaction

Alfv'en waves in the magnetosphere generated by shock wave / plasmapause interaction

Автор: Leonovich A.S., Quigang Zong, Kozlov D.A., Yongfu Wang

Журнал: Солнечно-земная физика @solnechno-zemnaya-fizika

Статья в выпуске: 2 т.5, 2019 года.

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We study Alfvén waves generated in the magnetosphere during the passage of an interplanetary shock wave. After shock wave passage, the oscillations with typical Alfvén wave dispersion have been detected in spacecraft observations inside the magnetosphere. The most frequently observed oscillations are those with toroidal polarization; their spatial structure is described well by the field line resonance (FLR) theory. The oscillations with poloidal polarization are observed after shock wave passage as well. They cannot be generated by FLR and cannot result from instability of high-energy particle fluxes because no such fluxes were detected at that time. We discuss an alternative hypothesis suggesting that resonant Alfvén waves are excited by a secondary source: a highly localized pulse of fast magnetosonic waves, which is generated in the shock wave/plasmapause contact region. The spectrum of such a source contains oscillation harmonics capable of exciting both the toroidal and poloidal resonant Alfvén waves.

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Magnetosphere, plasmapause, shock front, alfvén waves

Короткий адрес: https://sciup.org/142220326

IDR: 142220326   |   DOI: 10.12737/szf-52201902

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