Global Alfven Wave Heating of the Magnetosphere of Young Stars | Zendy

A. G. Elfimov | Zendy; R. M. O. Galvão | Zendy; V. JatencoPereira | Zendy; R. Opher | Zendy

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Global Alfven Wave Heating of the Magnetosphere of Young Stars

Author(s) -

A. G. Elfimov,

R. M. O. Galvão,

V. JatencoPereira,

R. Opher

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/379641

Subject(s) - physics , magnetosphere , plasma , alfvén wave , magnetohydrodynamics , astrophysics , magnetic field , magnetohydrodynamic drive , field line , dissipation , protein filament , computational physics , quantum mechanics , thermodynamics , genetics , biology

Excitation of a Global Alfven wave (GAW) is proposed as a viable mechanism toexplain plasma heating in the magnetosphere of young stars. The wave and basicplasma parameters are compatible with the requirement that the dissipationlength of GAWs be comparable to the distance between the shocked region at thestar's surface and the truncation region in the accretion disk. A two-fluidmagnetohydrodynamic plasma model is used in the analysis. A current carryingfilament along magnetic field lines acts as a waveguide for the GAW. Thecurrent in the filament is driven by plasma waves along the magnetic fieldlines and/or by plasma crossing magnetic field lines in the truncated region ofthe disk of the accreting plasma. The conversion of a small fraction of thekinetic energy into GAW energy is sufficient to heat the plasma filament toobserved temperatures.Comment: Submitted to ApJ, aheatf.tex, 2 figure

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