Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm51c..06h&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM51C-06
Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2753] Magnetospheric Physics / Numerical Modeling, [2772] Magnetospheric Physics / Plasma Waves And Instabilities
Scientific paper
A 2-dimensional hybrid code (particle ions and fluid electrons) is used to study electromagnetic ion cyclotron (EMIC) waves in a dipole magnetic field. The source of free energy is provided a population of hot protons with perpendicular temperature greater than the parallel temperature. The waves grow near the magnetic equator and initially propagate mostly in the parallel direction with respect to the magnetic field. As the waves continue traveling toward high magnetic latitudes, the wave fronts turn parallel to the magnetic field (consistent with wave vector perpendicular to the magnetic field) and the polarization of the waves shifts toward linear polarization. We will show results both for a single population of hot protons, and for multiple ion species including cold protons, singly charged helium and singly charged oxygen. For a single population of hot protons, we find that the wave energy propagates radially at about 0.1 times the Alfven speed, and that there is a radial coherence length of about 10 the proton inertial length. The presence of multiple ion species dramatically changes the distribution of waves due to the presence of resonant surfaces near the heavy ion gyrofrequencies. When the concentration of cold oxygen is large enough, waves generated on the helium branch reflect back at the He+/O+ bi-ion resonant frequencies. The resulting waves show a mixture of polarization, with linear and right hand polarization dominant.
Denton Richard E.
Hu Yan
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