Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...465..393s&link_type=abstract
Astrophysical Journal v.465, p.393
Astronomy and Astrophysics
Astronomy
26
Diffusion, Magnetohydrodynamics: Mhd, Plasmas, Waves
Scientific paper
We investigate linear and nonlinear behavior of Alfvén waves in weakly ionized plasmas. It is shown, from theory and a one-dimensional simulation, that the Alfvén waves with small amplitude damp as a result of ambipolar diffusion or ion-neutral drift. From the numerical analysis of steady solutions of nonlinear Alfvén waves, we show that ambipolar diffusion can lead to steepening of the magnetic field associated with the Alfvén wave, and even to the formation of a localized current sheet, as was found by Brandenburg & Zweibel using the strong coupling limit between ions and neutral particles. We also show the formation of periodic current filaments associated with the nonlinear Alfvén waves by using two-dimensional simulation. The formation process of sharp current filament structures by ambipolar diffusion is important near the photosphere on the Sun, as well as in the cold, dense portions of interstellar medium where stars are forming.
Sakai Jun-Ichi
Suzuki Masuo
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