Numerical studies on the propagation of sudden impulses in the dipole magnetosphere

Details Numerical studies on the propagation of sudden impulses in the dipole magnetosphere Numerical studies on the propagation of sudden impulses in the dipole magnetosphere

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106.8435l&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A5, p. 8435-8446

Physics

Plasma Physics

10

Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Storms And Substorms, Space Plasma Physics: Numerical Simulation Studies

Scientific paper

This paper presents a time-dependent numerical experiment when the dayside magnetopause is perturbed by sudden impulses in the solar wind. Magnetic and electric fields in a three-dimensional dipole model are investigated. Arrival timing over various locations is examined in the linear wave approximation. It is found that the propagation of the leading wavefronts undergoes significant refraction owing to the inhomogeneity of dipolar geometry. Compressional and transverse waves become differentiated in travel paths and arrival times near the polar ionospheric region. Our results also suggest that wave energy density becomes larger in the plasmasphere than in the outer magnetosphere. We discuss in detail how the plasmasphere affects the propagation of initial impulses.

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