Turbulent heating and cross-field transport near the magnetopause from THEMIS

Details Turbulent heating and cross-field transport near the magnetopause from THEMIS Turbulent heating and cross-field transport near the magnetopause from THEMIS

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3517s08c&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 17, CiteID L17S08

Physics

Geophysics

5

Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Nonlinear Geophysics: Turbulence (3379, 4568, 7863)

Scientific paper

We demonstrate that the low frequency broadband magnetic fluctuations observed during THEMIS spacecraft traversals near the Earth's magnetopause may be described as a turbulent spectrum of Doppler shifted kinetic Alfvén waves (KAWs). These waves are most intense along reconnected flux-tubes in the magnetosheath just outside the magnetopause. We identify distinct power-law scalings of wave spectral energy density in wavenumber and show that Landau (LD) and transit time damping (TD) on ions and electrons is largest at the wavenumber where the power-law index changes. The threshold amplitude for stochastic ion scattering/acceleration is also exceeded by these waves. These acceleration processes are manifest in observations of field-aligned and transverse heating of electrons and ions respectively. From integration over the range of observed wavenumbers we show that, if the wave-normal angles are sufficiently large, these waves can provide diffusive transport of magnetosheath plasmas across the magnetopause at up to the Bohm rate.

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