One-dimensional model of auroral magnetic-flux tubes with field-aligned current and cyclotron heating of ions

Details One-dimensional model of auroral magnetic-flux tubes with field-aligned current and cyclotron heating of ions One-dimensional model of auroral magnetic-flux tubes with field-aligned current and cyclotron heating of ions

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984kosis..22...67v&link_type=abstract

Kosmicheskie Issledovaniia (ISSN 0023-4206), vol. 22, Jan.-Feb. 1984, p. 67-86. In Russian.

Physics

Auroral Arcs, Field Aligned Currents, Geomagnetism, Ionospheric Currents, Ionospheric Ion Density, Space Plasmas, Atmospheric Models, Ionospheric Drift, Kinetic Equations, Magnetic Flux

Scientific paper

Characteristic scales and stationarity times are examined for various types of auroral structures. The method of kinetic-equation moments is used to construct a stationary system of drift-kinetic equations for ionospheric ions accelerated along a dipole flux tube, with allowance for temperature anisotropy for specified scales. It is shown that stationary solutions for auroral flux tubes exist only in the presence of a supersonic ascending flow of ionospheric ions. Given realistic values of the field-aligned current density, ions of ionospheric origin are found to be the dominant type of ion at the upper boundary of the acceleration region. It is also shown that the cyclotron heating of ions at the level limited by the broadening of ion resonances leads to a growth in perpendicular temperature of only several tens of eV at a parallel potential difference of 0.1-1 keV, which is insufficient to explain 'conical beams' with a perpendicular temperature of 0.1-1 keV.

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