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Collisional shear Alfve´n waves in sheared magnetic fields

 

作者: J. F. Drake,   Robert G. Kleva,  

 

期刊: Physics of Fluids(00319171)  (AIP Available online 1981)
卷期: Volume 24, issue 8  

页码: 1499-1507

 

ISSN:0031-9171

 

年代: 1981

 

DOI:10.1063/1.863554

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The structure of the shear Alfve´n waves is investigated in a collisional plasma with shear. The fourth‐order equation obtained by combining Ampere’s law and the quasi‐neutrality condition is solved by the method of matched asymptotic expansions fork⊥ &rgr;s≫≪1 to obtain the dispersion relation. A hierarchy of damped, localized modes are found which can have either even or odd parity. The solutions basically have the structure of kinetic Alfve´n modes trapped between the two Alfve´n cutoffs on either side of the rational surface. The mode damping arises from Ohmic dissipation by electrons near the rational surface. The relation between these modes, microtearing modes, and the Alfve´n continuum is discussed.

 

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