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Abstract

We examine the role of dipole tilt on solar wind driving of electromagnetic ion cyclotron (EMIC) waves in the magnetosphere using an advanced full-wave simulation code---Petra-M. While very little wave power reaches the inner magnetosphere without tilt effects, a tilted dipole field dramatically increases the efficiency of the coupling process. Solar wind fluctuations incident at high magnetic latitude can reach ionospheric altitudes more efficiently as they mode-convert to linearly polarized field-aligned propagating waves at the Alfvén and IIH resonances. We discuss implications of these results for seasonal and diurnal biases on externally driver EMIC waves and implications for radiation belt loss processes.