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Unusual divergence of magnetoacoustic beams

Abstrakt

Two-dimensional magnetosonic beams directed along a line forming a constant angle h with the equilibrium straight magnetic field are considered. Perturbations in a plasma are described by the system of ideal magnetohydrodynamic equations. The dynamics of perturbations in a beam are different in the cases of fast and slow modes, and it is determined by h and equilibrium parameters of a plasma. In particular, a beam divergence may be unusual in the case of parallel propagation (h ¼ 0). Diffraction is more pronounced in the case of parallel propagation as compared to a flow without magnetic field, and less manifested in the case of perpendicular propagation. The beams propagating oblique to the magnetic field do not reveal diffraction. The dynamics of perturbations in a beam are analytically described in the cases of weak and strong nonlinearity compared to diffraction. Small magnitude perturbations at the axis of a beam in unusual cases propagate slower than that in the plane wave. Involving of thermal conduction leads to the coupling equations describing thermal self-action of a beam, which behaves differently in the ordinary and unusual cases. Self-focusing may occur in the presence of a magnetic field instead of conventional defocusing in gases

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach
Opublikowano w:
PHYSICS OF PLASMAS nr 29,
ISSN: 1070-664X
Język:
angielski
Rok wydania:
2022
Opis bibliograficzny:
Perelomova A.: Unusual divergence of magnetoacoustic beams// PHYSICS OF PLASMAS -Vol. 29,iss. 4 (2022), s.042111-
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1063/5.0084431
Źródła finansowania:
  • COST_FREE
Weryfikacja:
Politechnika Gdańska

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