Transient Solar Wind Features and Their Effects on the Magnetosphere and the Ionosphere (Invited)

Details Transient Solar Wind Features and Their Effects on the Magnetosphere and the Ionosphere (Invited) Transient Solar Wind Features and Their Effects on the Magnetosphere and the Ionosphere (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm34a..01s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM34A-01

Physics

[2154] Interplanetary Physics / Planetary Bow Shocks, [2728] Magnetospheric Physics / Magnetosheath, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

Solar wind parameters are constantly varying. On time scales of 1-10 min, dynamic pressure variations are relatively infrequent, but variations in the interplanetary magnetic field orientation are relatively common. The pressures associated with suprathermal particles within the foreshock excavate density and magnetic field strength cavities on bundles of magnetic field lines connected to the bow shock, piling up density and magnetic field strength enhancements on neighboring magnetic field lines. Within the foreshock, the interaction of parallel propagating sinusoidal waves with highly oblique fast magnetosonic waves generates cavitons marked by depressions in the density and magnetic field strength. The pressure variations associated with both intrinsic solar wind and foreshock-generated density structures are transmitted through the magnetosheath and batter the magnetosphere, driving substantial magnetopause motion, triggering reconnection, and generating transient field-aligned currents that result in traveling convection vortices in the high latitude ionosphere. This talk reviews recent progress in understanding the interaction of solar wind pressure pulses with the magnetosphere and outlines future objectives.

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