Resonant absorption of ULF waves by heavy ion resonances in the inhomogeneous inner-magnetosphere

Details Resonant absorption of ULF waves by heavy ion resonances in the inhomogeneous inner-magnetosphere Resonant absorption of ULF waves by heavy ion resonances in the inhomogeneous inner-magnetosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1747l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1747

Physics

2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2768 Plasmasphere, 2772 Plasma Waves And Instabilities (2471), 7827 Kinetic And Mhd Theory, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

The inner magnetosphere contains various heavy ions, which play an important role in the storm time ring current. Unlike single ion case, multi-ion plasmas have their own resonances, which are composed of in- phase or anti-phase motions among the ions. In an inhomogeneous plasma such as the inner- magnetospheric region of large magnetic field gradients, these resonances tend to interact with compressional ULF and EMIC waves where frequencies match those of multi-ion resonances. By solving the full coupled wave equations in an exact manner, we present how the ambient EM waves are mode-converted into these resonances of heavy ions i) near the equatorial region where the inhomogeneity lies almost normal to the magnetic field, and ii) near the mid-latitude region where the density gradient has inclination angle with the magnetic field. In both cases, it is found that strong mode conversion into the enhanced ion motion occurs at each resonance frequency, which is determined simply by heavy ion composition. These resonances show linear polarization as well as field-aligned propagation, which can explain many features of previous unexplained statistical observations in the inner magnetosphere.

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