New Observations of Earth's Bow Shock

Details New Observations of Earth's Bow Shock New Observations of Earth's Bow Shock

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh42a..03p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH42A-03

Physics

Plasma Physics

[2154] Interplanetary Physics / Planetary Bow Shocks, [2164] Interplanetary Physics / Solar Wind Plasma, [7839] Space Plasma Physics / Nonlinear Phenomena, [7851] Space Plasma Physics / Shock Waves

Scientific paper

Plasma flowing at super-Alfvénic speeds has been observed in Earth’s magnetosheath by particle and field experiments crossing the Earth’s bow shock. Examination of several hundred crossings on the dayside downstream of the bow shock shows magnetosheath plasma flows at super-Alfvénic speeds ~90% of the time. We also find significant heat flux in the magnetosheath for both super- and sub-Alfvénic flows. Field-aligned current (J||) of several 10-6 A/m^2 is observed across the transition region and smaller J|| persists in the magnetosheath. The Boltzmann H function and dH/dt show while dH/dt ~0 in the solar wind, a large negative dH/dt “spike” is observed across the ramp. These observations will be discussed and compared to predicted features of current shock models.

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