Reflection of Alfven waves at an open magnetopause

Details Reflection of Alfven waves at an open magnetopause Reflection of Alfven waves at an open magnetopause

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.4257c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 4257-4263.

Physics

2

Magnetohydrodynamic Waves, Magnetopause, Magnetosphere-Ionosphere Coupling, Wave Reflection, Geomagnetism, Reflectance

Scientific paper

Reflection and transmission of Alfven waves at the open magnetopause is examined. Under the assumption that the magnetic fields on the two sides of the open magnetopause are coplanar with the normal direction of the magnetopause, the governing equations are solved numerically. The results show that the electric fields of emanating Alfven waves depend mainly on the number density and the magnetic field jumps across the magnetopause. Under conditions representing the open magnetopause, the latter behaves like a nearly perfect reflector. The solar wind flow is more or less unchanged by the loading effect of the Alfven wave incident on the magnetopause from the magnetospheric side. Thus, the open magnetopause can be seen as a constant voltage source.

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