Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33a1749s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA33A-1749
Physics
[0654] Electromagnetics / Plasmas
Scientific paper
Weakly ionized plasma layer is formed around a hypersonic vehicle. This plasma layer may cause the communications blackout or radio blackout. It occurs when the plasma frequency inside a layer around the vehicle exceeds the frequency of propagating signals. We analyze the ExB scheme for radio blackout mitigation which is based on a localized plasma density reduction in the plasma layer in the presence of magnetic field, produced by the current induced between two electrodes. We are interested in the set up with magnetized electrons, unmagnetized ions and charge neutrality maintained across a plasma layer. We show that in the proposed scheme criteria necessary for excitation of lower hybrid drift instability are fulfilled and corresponding effective collision frequency is large enough to provide an anomalous transport across the magnetic field, sufficient for effective implementation of the ExB scheme. Both analytical and numerical results show significant reduction of the plasma density and the possibility of enabling radio communication across the plasma layer.
Keidar M.
Mudaliar S.
Sotnikov Vladimir I.
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