Polarization properties of the fundamental mode and higher harmonics of standing shear Alfven waves in non-axisymmetric background magnetic fields.

Details Polarization properties of the fundamental mode and higher harmonics of standing shear Alfven waves in non-axisymmetric background magnetic fields. Polarization properties of the fundamental mode and higher harmonics of standing shear Alfven waves in non-axisymmetric background magnetic fields.

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0309k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0309

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts

Scientific paper

We present results concerning periods and polarizations of cold plasma ultra-low frequency (ULF) guided Alfven waves in a non-axisymmetric geomagnetic field model. The two fundamental modes which are differed by their polarizations, as well as their harmonics are included in the analysis. The background geomagnetic field is approximated by a compressed dipole model for which we propose a simple description in terms of Euler potentials. This study is motivated by the problem of outer-radiation belt electron energization by ULF waves, for which the polarization of the wave is of paramount importance. We consider an approximation in which Alfvenic waves are decoupled from compressional modes and find that the polarization of both the fundamental modelsas well as that of their harmonics can change significantly with local time. As a consequence, we find that the ULF wave's contribution to the MeV electron energization process can be localized in space. Furthermore, different harmonics of the fundamental mode also contribute to the electron energization in different regions of space.

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