Onedimensional model of an auroral magnetic field tube with longitudinal current and cyclotron heating of ions.
Abstract
Characteristic scales and stationarity times are examined for various types of auroral structures. The method of kineticequation moments is used to construct a stationary system of driftkinetic 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 fieldaligned 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 0.11 keV, which is insufficient to explain 'conical beams' with a perpendicular temperature of 0.11 keV.
 Publication:

Kosmicheskie Issledovaniia
 Pub Date:
 January 1984
 Bibcode:
 1984KosIs..22...67V
 Keywords:

 Auroral Arcs;
 Field Aligned Currents;
 Geomagnetism;
 Ionospheric Currents;
 Ionospheric Ion Density;
 Space Plasmas;
 Atmospheric Models;
 Ionospheric Drift;
 Kinetic Equations;
 Magnetic Flux;
 Geophysics;
 Aurorae:Magnetic Fields;
 Magnetic Fields:Aurorae