Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-30
Astrophys.J. 600 (2004) 292-295
Astronomy and Astrophysics
Astrophysics
Submitted to ApJ, aheatf.tex, 2 figures
Scientific paper
10.1086/379641
Excitation of a Global Alfven wave (GAW) is proposed as a viable mechanism to explain plasma heating in the magnetosphere of young stars. The wave and basic plasma parameters are compatible with the requirement that the dissipation length of GAWs be comparable to the distance between the shocked region at the star's surface and the truncation region in the accretion disk. A two-fluid magnetohydrodynamic plasma model is used in the analysis. A current carrying filament along magnetic field lines acts as a waveguide for the GAW. The current in the filament is driven by plasma waves along the magnetic field lines and/or by plasma crossing magnetic field lines in the truncated region of the disk of the accreting plasma. The conversion of a small fraction of the kinetic energy into GAW energy is sufficient to heat the plasma filament to observed temperatures.
Elfimov A. G.
Galvão Ricardo M. O.
Jatenco-Pereira Vera
Opher Reuven
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