Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..313z&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 4, p. 313-316.
Physics
6
Atmospheric Physics, Earth Ionosphere, Field Aligned Currents, Ionospheric Conductivity, Magnetohydrodynamic Waves, Wave Reflection, Magnetosphere-Ionosphere Coupling, Space Plasmas
Scientific paper
A study of the reflection of Alfven waves at a horizontally inhomogeneous ionosphere has been carried out. In this study, the Alfven speed above the ionosphere is assumed to be uniform and the ionosphere is treated as a height-integrated conducting slab. Analytical and numerical results indicate that the horizontal nonuniformity of the ionospheric conductivity can lead to a rotation of the reflected wave fields and cause field-aligned currents that originate in the ionosphere. A strong conductivity nonuniformity on the direction perpendicular to the incident wave field, large Hall to Pedersen conductivity ratios, and low conductivity values lead to a large rotation of the reflected wave field in the range from a few to 40 deg. The implications of the theoretical results for some ionospheric phenomena are presented, including comments on the Harang discontinuity and sun-aligned arcs.
Crain David J.
Schunk Robert W.
Sojka Jan J.
Zhu Lijun
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