Statistical study of mirror mode events in the Earth magnetosheath

Details Statistical study of mirror mode events in the Earth magnetosheath Statistical study of mirror mode events in the Earth magnetosheath

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51c1412g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM51C-1412

Physics

2728 Magnetosheath, 2772 Plasma Waves And Instabilities (2471), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Using a search and classification tool developed at CDPP (Centre de la Physique des Plasmas, http://cdpp.cesr.fr), we investigate the physics of the mirror instability. Indeed both analytical and observational recent studies have shown the paramount importance of this instability in the development of magnetosheath turbulence and its potential role in reconnection. 5 years of Cluster data have been mined by our tool which can be intuitively parametrized and set up with specific constraints on the actual data content. The strength of the method is illustrated by our results concerning the efficiency of different identification procedures. Beyond the presentation of the general mirror mode event distribution in the magnetosheath, some of the key questions we address include : evolution of the wave amplitude with the fractional distance to the boundaries (bow shock/magnetopause), mirror structure behaviour in relation with 1/ local parameters (plasma beta, temperature anisotropy) and 2/ conditioning parameters (solar wind Mach numbers, IMF orientation), tests of theoretical expressions obtained with different closure equations, ... The implications of these results for the mirror mode modelization is discussed.

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