Solar Wind Processing by the Bow Shock: Implications for Magnetopause Dynamics

Details Solar Wind Processing by the Bow Shock: Implications for Magnetopause Dynamics Solar Wind Processing by the Bow Shock: Implications for Magnetopause Dynamics

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm53b..02o&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM53B-02

Physics

2154 Planetary Bow Shocks, 2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2728 Magnetosheath, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

In addition to deceleration and heating of the solar wind, the bow shock impacts the solar wind through generation of ULF waves in the foreshock and magnetosheath. Also, the interaction of solar wind discontinuities with the bow shock lead to a variety of kinetic phenomena some of which are associated with drastic changes in plasma and fields in the magnetosheath, such as hot flow anomalies. In this presentation, we use results from global hybrid (kinetic ions, fluid electrons) simulations to illustrate a number of ways in which solar wind properties are modified by the bow shock. We then concentrate on the generation and evolution of ULF waves associated with the bow shock and how they interact with the magnetopause. The nature of this interaction is tied to the direction of the interplanetary magnetic field (IMF) and the angle (cone) it makes with solar wind flow direction. In the limit of radial IMF, the dayside bow shock corresponds to quasi- parallel regime with foreshock generated ULF waves modifying the solar wind and the magnetosheath properties. In the limit of large cone angles, the dayside bow shock is in the quasi-perpendicular regime leading to the generation of ion cyclotron and mirror mode waves in the magnetosheath. Relative to the quasi-parallel geometry, the magnetosheath plasma and fields are less turbulent during large cone angles and the influence of the bow shock on magnetopause dynamics may be though to be minimal. As we show however, the presence of ULF waves in the quasi-perpendicular magnetosheath has a significant impact on magnetopause by enhancing the time dependency of reconnection. Specifically, we show that the presence of ULF waves increases the rate of FTE formation by more than 50%.

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