Solnechno-Zemnaya Fizika Solnechno-Zemnaya Fizika Солнечно-земная физика 2712-9640 22669 10.12737/szf-52201912 Результаты исследований Results of current research Результаты исследований Second-order perturbations in Alfvén waves in cold plasma approximation Возмущения второго порядка в альфвеновских волнах в приближении холодной плазмы Дмитриенко Ирина Сергеевна Dmitrienko Irina Sergeevna dmitrien@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation 5 2 89 96 https://zh-szf.ru/en/nauka/article/22669/view

Изучены возмущения второго порядка по амплитуде, создаваемые альфвеновскими волнами. Для таких возмущений получены уравнения и найдены их решения. Показано, что возмущения второго порядка создаются магнитным давлением волн и представляют собой течения плазмы и возмущения магнитного поля в плоскости, перпендикулярной направлению возмущения поля и смещению плазмы в альфвеновской волне. В связи с интерпретацией наблюдаемых в хвосте магнитосферы быстрых потоков плазмы наибольший интерес представляет полученное описание течений второго порядка, связывающее их свойства со свойствами альфвеновских волн и породившего их возмущения. Результаты позволяют предположить, что по меньшей мере часть наблюдаемых в хвосте магнитосферы быстрых потоков плазмы может быть одним из проявлений распространяющихся альфвеновских волн. Используемая модель среды и приближение холодной плазмы вполне применимы на внешних краях плазменного слоя (PSBL), где наблюдается существенная часть быстрых потоков плазмы.

The second-order amplitude perturbations driven by Alfvén waves are studied. Equations for such second-order perturbations are derived and their solutions are found. The second-order perturbations are shown to be generated by the magnetic pressure of the waves. They represent plasma flows and magnetic field perturbations in a plane perpendicular to the direction of the field perturbation and plasma displacement in the Alfvén wave. In connection with the interpretation of fast plasma flows observed in the magnetotail, of particular interest is the description of second-order flows, which relates their properties to properties of Alfvén waves and the disturbance that generates them. The results suggest that at least some of the fast plasma flows observed in the magnetotail can be one of the manifestations of propagating Alfvén waves. The environment model and cold plasma approximation in use are quite applicable for the plasma sheet boundary layers, where an essential part of the fast plasma flows occurs.

 альфвеновские волны геомагнитный хвост быстрые потоки плазмы Alfvén waves magnetotail fast plasma flows

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