Other
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..375a&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 375-378.
Other
13
Heavy Ions, Ion Temperature, Ionospheric Heating, Space Plasmas, Auroral Zones, Electron Acceleration, Ion Motion, Oxygen Ions, Particle Acceleration, Simulation
Scientific paper
A new mechanism is proposed for plasma modes which can occur only in a multicomponent plasma and not in pure electron-ion plasma. The addition of ions creates a new instability near the ion-ion hybrid mode whose frequency is adequate for the wave to interact with oxygen ions. To study heating of ions (such as ionospheric oxygen ions) in presence of auroral electrons, several numerical simulations were carried out using a one-dimensional electrostatic code in a magnetic field. It was found that in the presence of electrons drifting along auroral field lines into the ionosphere, the ion-ion hybrid mode can be driven unstable when the electron drift speed is too small to excite the lower hybrid instability. Since the ion-ion mode has a smaller frequency than that of the lower hybrid waves, it can couple to the heavy ions, resulting in a substantial heating of heavy ions; on the other hand, because of their frequencies, the lower hybrid waves can accelerate only light ion species.
Ashour-Abdalla Maha
Kim Yong Seol
Okuda Haruyuki
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