Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 82800 10.12737/stp-104202402 Results of current research Results of current research Results of current research Ponderomotive redistribution of heavy ions along a magnetic field line Ponderomotive redistribution of heavy ions along a magnetic field line Гульельми Анатолий Владимирович Guglielmi Anatol Vladimirovich guglielmi@mail.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Фейгин Феликс Зеликович Feygin Felix Zelikovich feygin@ifz.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 https://orcid.org/0000-0002-4864-0993 Потапов Александр Сергеевич Potapov Alexander Sergeevich potapov@iszf.irk.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Институт физики Земли им. О.Ю. Шмидта РАН Москва Россия Schmidt Institute of Physics of the Earth, RAS Moscow Russian Federation Институт физики Земли им. О.Ю. Шмидта РАН Москва Россия Schmidt Institute of Physics of the Earth, RAS Moscow Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation 18 12 2024 18 12 2024 10 4 14 18 02 05 2024 26 07 2024 https://zh-szf.ru/en/nauka/article/82800/view

We set up the problem of ponderomotive separation and acceleration of ions with different charge-to-mass ratios under the influence of Alfvén waves, which constantly exist in the magnetosphere in the form of geomagnetic pulsations. Formulas for partial ponderomotive forces acting on light and heavy (metallic) ions are derived. In the quasi-hydrodynamic approximation, a system of equations is obtained which describes the distribution of ions along magnetic field lines in Earth’s magnetosphere. The Clarke number, which characterizes plasma metallicity, is found to be maximum at a minimum magnetic field on the field line along which the Alfvén wave propagates. This leads to the accumulation of heavy ions at the top of the field line at the point of its intersection with the magnetic equator. The theoretical conclusions agree with satellite measurements of the distribution of heavy ions along field lines in Earth’s magnetosphere.

We set up the problem of ponderomotive separation and acceleration of ions with different charge-to-mass ratios under the influence of Alfvén waves, which constantly exist in the magnetosphere in the form of geomagnetic pulsations. Formulas for partial ponderomotive forces acting on light and heavy (metallic) ions are derived. In the quasi-hydrodynamic approximation, a system of equations is obtained which describes the distribution of ions along magnetic field lines in Earth’s magnetosphere. The Clarke number, which characterizes plasma metallicity, is found to be maximum at a minimum magnetic field on the field line along which the Alfvén wave propagates. This leads to the accumulation of heavy ions at the top of the field line at the point of its intersection with the magnetic equator. The theoretical conclusions agree with satellite measurements of the distribution of heavy ions along field lines in Earth’s magnetosphere.

 partial ponderomotive forces Alfvén waves heavy ions ambipolar diffusion geomagnetic field Clarke number partial ponderomotive forces Alfvén waves heavy ions ambipolar diffusion geomagnetic field Clarke number The work was carried out under Government assignments of the Ministry of Science and Higher Education of the Russian Federation for IPE RAS and ISTP SB RAS The work was carried out under Government assignments of the Ministry of Science and Higher Education of the Russian Federation for IPE RAS and ISTP SB RAS

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