Electromagnetic waves on ion gyro-radii scales across the magnetopause

Details Electromagnetic waves on ion gyro-radii scales across the magnetopause Electromagnetic waves on ion gyro-radii scales across the magnetopause

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3809102y&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 9, CiteID L09102

Physics

Plasma Physics

Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Magnetosheath, Space Plasma Physics: Kinetic Waves And Instabilities, Space Plasma Physics: Transport Processes

Scientific paper

This report presents the first study of the global distribution and properties of kinetic scale electromagnetic waves on the Earth's magnetopause. From a statistical study using THEMIS fields observations over a frequency range from 0.01-2 Hz, we find waves on scales of the order of ion gyro-radii at all magnetic local times surveyed (4-20 MLT). The spectral energy densities ($\epsilon$) within these waves across the magnetopause are larger on the dawn (4-12 MLT) than duskside (12-20 MLT) irrespective of the direction of the magnetosheath magnetic field BZ_sheath component. Furthermore, these observations reveal that $\epsilon$ is magnetic shear dependent with large enhancements for shear angle >60°. The similarity between dawn-dusk asymmetry in $\epsilon$ we observe and reported distribution of magnetosheath ions in the magnetosphere suggest that gyro-radii scale magnetic field structures/waves may facilitate a significant fraction of cross magnetopause plasma transport.

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