O(+) acceleration due to resistive momentum transfer in the auroral field line plasma

Details O(+) acceleration due to resistive momentum transfer in the auroral field line plasma O(+) acceleration due to resistive momentum transfer in the auroral field line plasma

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.7573m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Sept. 1, 1984, p. 7573-7576. NASA-Navy-supported research.

Physics

10

Auroral Zones, Ion Motion, Momentum Transfer, Particle Acceleration, Space Plasmas, Electric Fields, Field Aligned Currents, Ionospheric Propagation, Lines Of Force, Oxygen Ions, Positive Ions

Scientific paper

An analytical model is defined to demonstrate that parallel acceleration of an O(+) ion beam in the ionosphere can occur naturally due to the presence of a quasi-static parallel electric field. Momentum equations are defined for friction between hydrogen ions and electrons, which produces a quasi-static electric field. The field can accelerate ions, e.g., the O(+) ions, which do not participate in the frictional momentum exchange. The conditions are shown to be applicable to the auroral field line plasma if a current is present along the magnetic field. A simulation performed with the equations shows that the field line plasma exhibits dynamic behavior after a field-aligned current appears. The resulting momentum gain by O(+) ions can be sufficient for causing a potential drop of several kilovolts along the field line.

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