Transient response of the Earth's magnetosphere to a localized density pulse in the solar wind: Simulation of traveling convection vortices

Details Transient response of the Earth's magnetosphere to a localized density pulse in the solar wind: Simulation of traveling convection vortices Transient response of the Earth's magnetosphere to a localized density pulse in the solar wind: Simulation of traveling convection vortices

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10903204k&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A3, CiteID A03204

Physics

6

Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Current Systems (2409), Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers

Scientific paper

We investigate the transient response of the Earth's magnetosphere-ionosphere system to a localized density pulse in the solar wind using a magnetohydrodynamic simulation. The simulated ionospheric disturbances exhibit many properties similar to those observed during traveling convection vortices (TCVs). The simulated TCVs are driven by pairs of field-aligned currents. The generation mechanisms of the field-aligned currents in the magnetosphere are evaluated in terms of a wave equation of field-aligned currents. The source current is the inertial current associated with in-out plasma acceleration in the magnetosphere near the impact region. The inertial current is converted into the field-aligned current off from the equatorial region via the curvilinear effect. The inhomogeneous effect also generates the field-aligned current near the inner equatorial region where the sharp gradient of Alfvén speed exists.

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