Structure of the lunar wake: global hybrid simulations

Details Structure of the lunar wake: global hybrid simulations Structure of the lunar wake: global hybrid simulations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43a1477s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM43A-1477

Physics

2753 Numerical Modeling, 2772 Plasma Waves And Instabilities (2471), 2780 Solar Wind Interactions With Unmagnetized Bodies

Scientific paper

We study the structure and properties of the lunar wake with these solar wind parameters: the angle θsw between directions of the solar wind velocity \boldsymbol{v}sw and the ambient interplanetary magnetic field (IMF) \boldsymbol{B} θsw=45° and 90° and vsw=6{v}A (where v_A denotes solar wind Alfvén velocity). We examine the structure of the wake-tail formed behind the obstacle. In agreement with in situ observations the lunar wake is formed by two counterstreaming beams which fill the wake with a relatively cold, inhomogeneous and highly anisotropic plasma. The results of this study suggest, that under the given solar wind conditions the downstream region of the lunar wake is dominated by an electromagnetic turbulence with the frequencies about the local proton gyrofrequency. The properties and possible generating mechanisms of the low-frequency electromagnetic turbulence are discussed.

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