Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm52b..01z&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM52B-01
Physics
Plasma Physics
[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2799] Magnetospheric Physics / General Or Miscellaneous, [7851] Space Plasma Physics / Shock Waves
Scientific paper
Both hot flow anomalies (HFAs) and foreshock cavities are events observed upstream from the bow shock. They have similarities and differences. Both HFAs and and foreshock cavities are characterized by enhanced magnetic field strengths and densities bounding regions of depressed magnetic field strength and density. In addition, energy particles are often present in both types of events. Foreshock cavities are less prominent than the HFAs in the sense that the solar wind distributions within the cavities show little evidence of heating or significant flow deflection although a second, suprathermal population is present. In addition, unlike HFAs, foreshock cavities are not associated with interplanetary discontinuities separating regions with significantly different plasma parameters and field orientations, although they do possess some local internal structure. We present THEMIS observations of a structure that started as a foreshock cavity and finally evolved into an HFA which is characterized by significant flow deflection and dramatic plasma heating.
Angelopoulos Vassilis
Glassmeier K.-
Larson Davin E.
McFadden James P.
Omidi Nojan
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