Shabansky Orbits and High Latitude Chorus

Details Shabansky Orbits and High Latitude Chorus Shabansky Orbits and High Latitude Chorus

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23c..06m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM23C-06

Physics

[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

High latitude chorus is a whistler-mode VLF emission that is observed on the dayside at high L-shells. Recent observations show presence of these waves in off-equatorial regions. In the presence of off-equatorial magnetic field minima, trapped particles undergo so-called Shabansky orbits, which can lead to temperature anisotropies off the equator. Additionally, drift shell splitting (DSS) can produce anisotropies in a compressed dipole. We use a 3D particle tracing code in a tunable analytic compressed-dipole field to study the role of Shabansky orbits on generating a temperature anisotropy in relativistic electrons. By adjusting the dependence on L of the phase space density, we can distinguish between DSS and effects from Shabansky orbits. We use the computed anisotropy for both cases along with a cold plasma model to compute a linear convective wave growth rate for waves in off-equatorial regions. By performing these simulations without energizing processes, we can definitively determine what roles Shabansky orbits DSS have in high latitude chorus wave growth.

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