IGPP Seminar Series

The Global Dynamics and Impacts of the Bow Shock

by Nick Omidi
Solana Scientific, Inc.

Abstract

The bow shock determines the properties of the magnetosheath which in turn impacts the transport processes at the magnetopause. Under steady solar wind conditions the impacts of the bow shock are controlled by the IMF cone angle. During large cone angles, the dayside bow shock is in the quasi-perpendicular regime where ion dissipation processes lead to the generation of ULF waves in the magnetosheath such as ion cyclotron and mirror mode waves. During small cone angles, the ion foreshock falls on the dayside modifying the solar wind conditions prior to reaching the quasi-parallel bow shock. In this limit, magnetosheath properties are determined by ULF waves and turbulence in the foreshock and their transformation as they cross the shock. Solar wind conditions are often time dependent with many embedded discontinuities with different properties. The interaction of the dynamic solar wind and the foreshock/bow shock lead to a variety of phenomena that make the overall interaction quite complex and topic of ongoing research. In this talk, we use results of 2.5- and 3-D electromagnetic hybrid (kinetic ions, fluid electrons) simulations and spacecraft observations to review this complex interaction and discuss their magnetospheric impacts.
Tuesday, 19 April 2011
3853 Slichter Hall
Refreshments at 3:45 PM
Lecture at 4:00 PM