| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Solution of Magnetohydrodynamic Oscillations in Electrolytes with Ion-Neutral Collisions |
| LIU Yuan-Tao1,2**, ZHAO Hua1, LI Lei1, FENG Yong-Yong1 |
1Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190
2Graduate University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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LIU Yuan-Tao, ZHAO Hua, LI Lei et al 2012 Chin. Phys. Lett. 29 115201 |
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Abstract The single-fluid Magnetohydrodynamic (MHD) equations for electrolytes in the presence of a magnetic field are derived from multi-fluid MHD equations with ion-neutral collisions in partially ionized conductive fluids. The dispersion relationship of MHD waves is also investigated, which is different from that for plasmas or liquid metals. Based on the equations, we find that MHD waves are dispersive in electrolytes, and the critical frequencies for excitation of Alfven waves vary with magnetic field or conductivity, so the exciting of MHD waves is severely restricted in electrolytes with relatively low conductivity except at an extremely low frequency or when it is permeated by a considerably strong ambient magnetic field. These theories are applied to seawater to estimate the magnetic field vibration caused by the large-scale motion of seawater (e.g., ocean currents or tides). It is found that high frequency waves are dampened severely in seawater, while low frequency waves can propagate over a long distance without much attenuation.
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Received: 11 April 2012
Published: 28 November 2012
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| PACS: |
52.30.Cv
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(Magnetohydrodynamics (including electron magnetohydrodynamics))
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52.35.Bj
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(Magnetohydrodynamic waves (e.g., Alfven waves))
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91.50.Iv
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(Marine magnetics and electromagnetics)
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