Ponderomotive modification of multicomponent magnetospheric plasma due to electromagnetic ion cyclotron waves

Nekrasov, A. K.; Feygin, F. Z.

doi:10.1007/s10509-013-1443-0

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…MHD momentum equation. Away from the low frequency limit, circular polarized waves may give slightly different forces, with left and right circular polarization being different from each other as well as linear polarization (e.g., Nekrasov and Feygin, 2013). In nonuniform B in the low frequency limit, the ponderomotive force is given by…”

Section: The Ponderomotive Forcementioning

confidence: 99%

The FIP and Inverse FIP Effects in Solar and Stellar Coronae

Laming

2015

Living Rev. Sol. Phys.

288

304

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We review our state of knowledge of coronal element abundance anomalies in the Sun and stars. We concentrate on the first ionization potential (FIP) effect observed in the solar corona and slow-speed wind, and in the coronae of solar-like dwarf stars, and the "inverse FIP" effect seen in the corona of stars of later spectral type; specifically M dwarfs. These effects relate to the enhancement or depletion, respectively, in coronal abundance with respect to photospheric values of elements with FIP below about 10~eV. They are interpreted in terms of the ponderomotive force due to the propagation and/or reflection of magnetohydrodynamic waves in the chromosphere. This acts on chromospheric ions, but not neutrals, and so can lead to ion-neutral fractionation. A detailed description of the model applied to closed magnetic loops, and to open field regions is given, accounting for the observed difference in solar FIP fractionation between the slow and fast wind. It is shown that such a model can also account for the observed depletion of helium in the solar wind. The helium depletion is sensitive to the chromospheric altitude where ion-neutral separation occurs, and the behavior of the helium abundance in the closed magnetic loop strongly suggests that the waves have a coronal origin. This, and other similar inferences may be expected to have a strong bearing on theories of solar coronal heating. Chromospheric waves originating from below as acoustic waves mode convert, mainly to fast mode waves, can also give rise to ion-neutral separation. Depending on the geometry of the magnetic field, this can result in FIP or Inverse FIP effects. We argue that such configurations are more likely to occur in later-type stars (known to have stronger field in any case), and that this explains the occurrence of the Inverse FIP effect in M dwarfs.Comment: Review paper submitted to Living Reviews in Solar Physics. 74 pages. Some material revised and updated from astro-ph/0405230, arXiv:0901.3350, arXiv:1110.435

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Section: The Ponderomotive Forcementioning

confidence: 99%

The FIP and Inverse FIP Effects in Solar and Stellar Coronae

Laming

2015

Living Rev. Sol. Phys.

288

304

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“…We have devoted a number of theoretical studies to the problem of ponderomotive forces in near-Earth plasma (see [Guglielmi, Feygin, 2018;Guglielmi, 1992;Feygin at al., 1997Feygin at al., , 1998Nekrasov, Feygin, 2013;Barnett et al, 2022;Espinoza-Troni et al, 2023] and references therein). At the same time, we considered the plasma medium in a hydrodynamic approximation as a whole.…”

Section: Introductionmentioning

confidence: 99%

Partial ponderomotive forces of Alfvén waves in near-Earth plasma

Guglielmi,

Feygin

2023

Solar-Terrestrial Physics

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In the study of the ponderomotive action of Alfvén waves on near-Earth plasma, the general formula for ponderomotive forces, known in classical electrodynamics of continuous media, was previously used. The formula does not explicitly take into account the multi-ion composition of the plasma. Under the action of the waves, significant changes were found in macroscopic parameters — plasma density and velocity. Plasma in Earth’s magnetosphere contains ions with different charge-to-mass ratios. Besides hydrogen and helium ions, the plasma has an admixture of oxygen ions of ionospheric origin, as well as an admixture of other heavy ions. In this connection, a wide range of problems arise on the ponderomotive separation of ions of various types. To solve these problems, it is proposed to use partial ponderomotive forces and to describe the plasma not by hydrodynamic, but by quasi-hydrodynamic equations. In this paper, we discuss the derivation of partial forces for a traveling monochromatic Alfvén wave, and also suggest a method for deriving more general formulas by expanding the classical formula, known in macroscopic electrodynamic, into the sum of partial forces. The ponderomotive separation of ions is illustrated by the example of the problem for diffusion equilibrium of magnetospheric plasma. We propose a hypothesis that Alfvén waves redistribute plasma along geomagnetic field lines in such a way that the plasma at the magnetic field minima is characterized by an increased content of heavy ions. We suggest that a small admixture of heavy ions exists in the polar wind jet stream. The article is dedicated to the 80th anniversary of the discovery of Alfvén waves.

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Modification of the magnetospheric plasma in outside of the noon meridional plane due to ponderomotive forces by ion–cyclotron waves

Nekrasov

Feygin

2015

Astrophys Space Sci

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Ponderomotive modification of multicomponent magnetospheric plasma due to electromagnetic ion cyclotron waves

Cited by 7 publications

References 28 publications

The FIP and Inverse FIP Effects in Solar and Stellar Coronae

The FIP and Inverse FIP Effects in Solar and Stellar Coronae

Partial ponderomotive forces of Alfvén waves in near-Earth plasma

Modification of the magnetospheric plasma in outside of the noon meridional plane due to ponderomotive forces by ion–cyclotron waves

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