Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 49039 10.12737/stp-82202214 17th Annual Conference “Plasma Physics in the Solar System”. February 7–11, 2022, Space Research Institute RAS, Moscow, Russia 17th Annual Conference “Plasma Physics in the Solar System”. February 7–11, 2022, Space Research Institute RAS, Moscow, Russia 17th Annual Conference “Plasma Physics in the Solar System”. February 7–11, 2022, Space Research Institute RAS, Moscow, Russia Generation of Alfvén waves in magnetized plasma by laser plasma bunches at Mach numbers much less than unity Generation of Alfvén waves in magnetized plasma by laser plasma bunches at Mach numbers much less than unity Тищенко Владимир Николаевич Tishchenko Vladimir Nikolaevich tvn25@ngs.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Березуцкий Артем Григорьевич Berezutsky Artem Grigorievich a.berezuckiy@yandex.ru Дмитриева Лейла Рамизовна Dmitrieva Leila Ramizovna dmitrieva-leyla@mail.ru Miroshnichenko Ilya B. Miroshnichenko Ilya B. mib383@gmail.com

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Шайхисламов Ильдар Фаритович Shaikhislamov Ildar Faritovich ildars@ngs.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Институт лазерной физики СО РАН Новосибирск Россия Institute of Laser Physics SB RAS Novosibirsk Russian Federation Институт лазерной физики СО РАН Новосибирск Россия Institute of Laser Physics SB RAS Novosibirsk Russian Federation Институт лазерной физики СО РАН Новосибирск Россия Institute of Laser Physics SB RAS Novosibirsk Russian Federation Институт лазерной физики СО РАН Новосибирск Россия Institute of Laser Physics, SB RAS Novosibirsk Russian Federation Институт лазерной физики СО РАН Новосибирск Россия Institute of Laser Physics SB RAS Novosibirsk Russian Federation 30 06 2022 30 06 2022 8 2 91 97 28 02 2022 07 06 2022 https://zh-szf.ru/en/nauka/article/49039/view

In this paper, we examine a torsional Alfvén wave produced by periodic plasma bunches in a magnetized plasma flux tube. A new effect has been revealed: the wave is generated not only during the action of bunches, but also for a long time after the termination, which makes it possible to increase the wavelength by several times. We have determined the conditions under which the wave contains η~40 % of the total bunch energy. The wave radius depends on the energy of one bunch; and the length, on their number. The optimum number of bunches is 15. Simultaneously with the Alfvén wave, a bunch plasma jet (η~35 %) and a slow magnetosonic wave (η~10 %) propagate in the force tube. Similarity parameters scale the results to laboratory and near-Earth magnetized plasma.

In this paper, we examine a torsional Alfvén wave produced by periodic plasma bunches in a magnetized plasma flux tube. A new effect has been revealed: the wave is generated not only during the action of bunches, but also for a long time after the termination, which makes it possible to increase the wavelength by several times. We have determined the conditions under which the wave contains η~40 % of the total bunch energy. The wave radius depends on the energy of one bunch; and the length, on their number. The optimum number of bunches is 15. Simultaneously with the Alfvén wave, a bunch plasma jet (η~35 %) and a slow magnetosonic wave (η~10 %) propagate in the force tube. Similarity parameters scale the results to laboratory and near-Earth magnetized plasma.

 plasma bunches magnetic field Alfvén wave numerical simulation plasma bunches magnetic field Alfvén wave numerical simulation The work was carried out under Government Assignment, project No. 0243-2021-0003 The work was carried out under Government Assignment, project No. 0243-2021-0003

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