Small-scale structure of Birkeland currents with anomalous resistance and the heat-balance problem

Details Small-scale structure of Birkeland currents with anomalous resistance and the heat-balance problem Small-scale structure of Birkeland currents with anomalous resistance and the heat-balance problem

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983kosis..21...95l&link_type=abstract

Kosmicheskie Issledovaniia, vol. 21, Jan.-Feb. 1983, p. 95-105. In Russian.

Physics

Birkeland Currents, Magnetospheric Ion Density, Plasma Currents, Space Plasmas, Electrical Resistance, Electrostatic Waves, Field Aligned Currents, Fine Structure, Heat Balance, Ion Temperature, Ionic Diffusion, Kinetic Equations, Plasma Temperature, Plasma Turbulence, Plasma-Particle Interactions

Scientific paper

Previous studies have shown that an intense turbulent heating of particles occurs in regions of magnetospheric electrostatic wave turbulence (EWT) arising in flux tubes with field-aligned currents; observations show, however, that the temperature of the principal part of the plasma remains constant. This paper proposes a possible mechanism for energy transfer from EWT regions in the case of the ambipolar anomalous diffusion of a small number of fast ions which have acquired energy in the interaction with waves through transverse gradients of flux tubes with currents. The kinetic equation for such ions is derived and solved. It is shown that this energy-transfer mechanism is sufficiently effective for transverse EWT dimensions of the order of a kilometer and for boundary layer thickness of the order of the Lamor radius of thermal ions.

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