H+ ion acceleration in the mid-altitude ionosphere

Details H+ ion acceleration in the mid-altitude ionosphere H+ ion acceleration in the mid-altitude ionosphere

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..623d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 5, p. 623-626

Physics

1

Charge Exchange, Earth Ionosphere, Electromagnetic Acceleration, Electromagnetic Measurement, Hydrogen Ions, Ion Cyclotron Radiation, Particle Acceleration, Ion Distribution, Magnetosonic Resonance, Monte Carlo Method, Remote Sensing

Scientific paper

H+ ion acceleration by electromagnetic ion cyclotron waves in the Earth's mid-altitude (300 to 2000 km) ionosphere is investigated. Below about 800 km, the ionospheric density is sufficiently high to induce significant collision rates between thermal particles and accelerated H+ ions. The dominant collisions are associated with ion-ion Coulomb interactions and with charge exchange reactions of the type H+ +A yields H + A+. These reactions are able to substantially modify the space and velocity distribution of the accelerated H+ ions. Using Monte-Carlo simulations, it is shown that the combination of collisions and ion cyclotron acceleration produces energetic H+ ion distributions whose characteristics (flux, average energy and pitch angle) are in quantitative agreement with satellite observations. The distributions of the energetic H atoms which are produced by charge exchange and which might be used for remote sensing of such H+ ion acceleration processes, are also presented.

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