Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm11c1174j&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM11C-1174
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2487 Wave Propagation (6934), 2704 Auroral Phenomena (2407), 7867 Wave/Particle Interactions
Scientific paper
Electromagnetic ion cyclotron waves with frequencies in the range 1-100 Hz are commonly observed in concert with upwelling ionospheric ions in the auroral acceleration region. Observations typically show that the waves have Poynting flux directed into the ionosphere. Moreover, waves with similar frequencies have also been detected by rockets and ground based magnetometers, which suggests that they transport energy to ionospheric altitudes where they can heat the ions. We model wave propagation between a magnetospheric source and the ground by solving the full electromagnetic wave equations including a realistic ionospheric model that includes multiple ion species and collisional effects. Ions are heated via ion cyclotron heating and collisional Joule dissipation. Wave heating significantly modifies the heavy ion profiles, thus altering wave propagation, dissipation, and selective heating of ions. We present wave solutions and ion distributions that illustrate this feedback process.
Cheng C. Z.
Johnson Jay Robert
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