Two-Fluid Aspect of Magnetosheath Plasma

Details Two-Fluid Aspect of Magnetosheath Plasma Two-Fluid Aspect of Magnetosheath Plasma

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm41b0787h&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM41B-0787

Physics

2700 Magnetospheric Physics, 2728 Magnetosheath

Scientific paper

Temperature anisotropy has been found to be an intrinsic characteristic of magnetosheath plasmas. Two types of energy closure, the bounded anisotropy and the double-polytropic laws, have been proposed to describe the thermodynamic evolution of protons as they convect from the bow shock to magnetopause. In both models, the physical mechanisms responsible for the breakdown of double-adiabatic laws are, respectively, attributed to the effects of ion cyclotron wave instability and of nonideal MHD/heat flux etc. The WIND observations however show that in some cases the electrons may exhibit a pronounced temperature anisotropy. In this study we examine the thermodynamics of magnetosheath plasmas from the two-fluid point of view. We derive the energy equations for both ions and electrons and show the consistency between theory and observation.

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