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Medientyp:
E-Artikel
Titel:
Plasma Flows in Solar Filaments as Electromagnetically Driven Vortical Flows
Beteiligte:
Litvinenko, Yuri E.
Erschienen:
MDPI AG, 2021
Erschienen in:
Physics, 3 (2021) 4, Seite 1046-1050
Sprache:
Englisch
DOI:
10.3390/physics3040065
ISSN:
2624-8174
Entstehung:
Anmerkungen:
Beschreibung:
Electromagnetic expulsion acts on a body suspended in a conducting fluid or plasma, which is subject to the influence of electric and magnetic fields. Physically, the effect is a magnetohydrodynamic analogue of the buoyancy (Archimedean) force, which is caused by the nonequal electric conductivities inside and outside the body. It is suggested that electromagnetic expulsion can drive the observed plasma counter-streaming flows in solar filaments. Exact analytical solutions and scaling arguments for a characteristic plasma flow speed are reviewed, and their applicability in the limit of large magnetic Reynolds numbers, relevant in the solar corona, is discussed.