Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 12008 10.12737/19859 Results of current research Results of current research Results of current research On the possibility for laboratory simulation of generation of Alfvén disturbances in magnetic tubes in the solar atmosphere On the possibility for laboratory simulation of generation of Alfvén disturbances in magnetic tubes in the solar atmosphere Прокопов Павел Анатольевич Prokopov Pavel Anatolyevich paprok312@gmail.com Захаров Юрий Петрович Zakharov Yuriy Petrovich kilz@mail.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Тищенко Владимир Николаевич Tishchenko Vladimir Nikolaevich tvn25@ngs.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Бояринцев Эдуард Леонидович Boyarintsev Eduard Leonidovich dlp@laser.nsc.ru Мелехов Александр Викторович Melekhov Aleksandr Viktorovich dlp@laser.nsc.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Пономаренко Арнольд Григорьевич Ponomarenko Arnold Grigoryevich pon@academ.org

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Посух Виталий Георгиевич Posukh Vitaliy Georgievich posukh@mail.ru 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 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 05 2016 30 05 2016 2 1 19 33 https://zh-szf.ru/en/nauka/article/12008/view

The paper deals with generation of Alfvén plasma disturbances in magnetic flux tubes through exploding laser plasma in magnetized background plasma. Processes with similar effect of excitation of torsion-type waves seem to provide energy transfer from the solar photosphere to the corona. The studies were carried out at experimental stand KI-1 representing a high-vacuum chamber 1.2 m in diameter, 5 m in length, external magnetic field up to 500 G along the chamber axis, and up to 2·10–6 Torr pressure in operating mode. Laser plasma was produced when focusing the CO2 laser pulse on a flat polyethylene target, and then the laser plasma propagated in θ-pinch background hydrogen (or helium) plasma. As a result, the magnetic flux tube 15–20 cm in radius was experimentally simulated along the chamber axis and the external magnetic field direction. Also, the plasma density distribution in the tube was measured. Alfvén wave propagation along the magnetic field was registered from disturbance of the magnetic field transverse component Bφ and field-aligned current Jz. The disturbances propagate at a near-Alfvén velocity 70–90 km/s and they are of left-hand circular polarization of the transverse component of magnetic field. Presumably, the Alfvén wave is generated by the magnetic laminar mechanism of collisionless interaction between laser plasma cloud and background. A right-hand polarized high-frequency whistler predictor was registered which propagated before the Alfvén wave at a velocity of 300 km/s. The polarization direction changed with the Alfvén wave coming. Features of a slow magnetosonic wave as a sudden change in background plasma concentration along with simultaneous displacement of the external magnetic field were found. The disturbance propagates at ~20–30 km/s velocity, which is close to that of ion sound at low plasma beta value. From preliminary estimates, the disturbance transfers about 10 % of the original energy of laser plasma.

The paper deals with generation of Alfvén plasma disturbances in magnetic flux tubes through exploding laser plasma in magnetized background plasma. Processes with similar effect of excitation of torsion-type waves seem to provide energy transfer from the solar photosphere to the corona. The studies were carried out at experimental stand KI-1 representing a high-vacuum chamber 1.2 m in diameter, 5 m in length, external magnetic field up to 500 G along the chamber axis, and up to 2·10–6 Torr pressure in operating mode. Laser plasma was produced when focusing the CO2 laser pulse on a flat polyethylene target, and then the laser plasma propagated in θ-pinch background hydrogen (or helium) plasma. As a result, the magnetic flux tube 15–20 cm in radius was experimentally simulated along the chamber axis and the external magnetic field direction. Also, the plasma density distribution in the tube was measured. Alfvén wave propagation along the magnetic field was registered from disturbance of the magnetic field transverse component Bφ and field-aligned current Jz. The disturbances propagate at a near-Alfvén velocity 70–90 km/s and they are of left-hand circular polarization of the transverse component of magnetic field. Presumably, the Alfvén wave is generated by the magnetic laminar mechanism of collisionless interaction between laser plasma cloud and background. A right-hand polarized high-frequency whistler predictor was registered which propagated before the Alfvén wave at a velocity of 300 km/s. The polarization direction changed with the Alfvén wave coming. Features of a slow magnetosonic wave as a sudden change in background plasma concentration along with simultaneous displacement of the external magnetic field were found. The disturbance propagates at ~20–30 km/s velocity, which is close to that of ion sound at low plasma beta value. From preliminary estimates, the disturbance transfers about 10 % of the original energy of laser plasma.

 Solar corona heating magnetic flux tubes Alfvén waves slow magnetosonic waves whistlers magnetic laminar mechanism Solar corona heating magnetic flux tubes Alfvén waves slow magnetosonic waves whistlers magnetic laminar mechanism

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