Statistical analysis of the properties of foreshock density cavitons

Details Statistical analysis of the properties of foreshock density cavitons Statistical analysis of the properties of foreshock density cavitons

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51a1611k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51A-1611

Other

2154 Planetary Bow Shocks, 2164 Solar Wind Plasma, 2772 Plasma Waves And Instabilities (2471), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Global hybrid simulations (kinetic ions, fluid electrons) have shown the existence of foreshock density cavitons immersed in regions permeated by ULF waves (Omidi, 2007, Blanco-Cano et al., 2008). These cavitons are characterized by large depressions in magnetic field magnitude and density, and are bounded by regions with enhanced field and density. In this work we study statistical properties of foreshock cavitons observed by Cluster spacecraft between the years 2001 and 2005. We have identified approximately 90 foreshock cavitons and use magnetic field and plasma data to analyze their durations, sizes, amplitude, and orientation. We compare caviton B and n values with ambient values. We also study the foreshock conditions in which the cavitons are detected, i.e. θBV, the angle between the incoming solar wind flow and the IMF, and Mach number, among others. We also determine the characteristics of the waves that surround the cavitons or even appear within them. We find that the foreshock cavitons can be observed in various ways - some are found as single cavitons immersed in ULF waves, others appear in groups, separated temporally only by a few minutes. In some cases we find two or three cavitons that are in the process of merging into a larger structure, and still developing.

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