Observations of draping plasma accelerations in the magnetosheath under IMF Bz North

Details Observations of draping plasma accelerations in the magnetosheath under IMF Bz North Observations of draping plasma accelerations in the magnetosheath under IMF Bz North

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41a1998h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM41A-1998

Physics

Plasma Physics

[2728] Magnetospheric Physics / Magnetosheath, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7845] Space Plasma Physics / Particle Acceleration, [7954] Space Weather / Magnetic Storms

Scientific paper

Accelerations in the magnetosheath due to draping of the Interplanetary Magnetic Field (IMF) around the magnetosphere is a rich topic of renewed interest. Here, we study these draping events in the first statistical study of draping related accelerations in the magnetosheath. We present a methodology to unambiguously identify draping related accelerations from reconnection, and present several case studies of 34 identified events. To discourage reconnection, we focus on the IMF Bz northward phase of ICMEs identified by Cane and Richardson [2010] from 1997-2010, and spacecraft that are low in the ecliptic plane to avoid reconnection at high latitudes. We study the effect of upstream MA and Magnetic Local Time (MLT) on the ratio at which the magnetosheath speeds exceed the speed of the solar wind, and compare with theory. We find that the ratio of magnetosheath speed to speed of the solar wind increases with decreasing MA, and show the suggested positional dependance along the magnetopause of this ratio with respect to the east-west terminator as well as global trends.

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