Japan Geoscience Union Meeting 2014

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International Session (Oral)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM10_29PM1] Wave, Turbulence, Reconnection, and Energetic Particles in Solar, Space and Laboratory

Tue. Apr 29, 2014 2:15 PM - 4:00 PM 414 (4F)

Convener:*Huirong Yan(Kavli Institute of Astronomy & Astrophysics), Takeru Suzuki(Department of Physics, School of Science, Nagoya University), Alex Lazarian(University of Wisconsin-Madison), Chair:Huirong Yan(Kavli Institute of Astronomy & Astrophysics)

3:30 PM - 3:45 PM

[PEM10-05] Wave reflection-driven accretion in active solar-type star winds

*Takeru SUZUKI1, Yasumasa TERANISHI1 (1.Nagoya University)

Keywords:Wave, MHD, stellar wind, accretion

In MHD simulations for winds from active solar-type stars by Suzuki et al.(2013), intermittent but long-time accretion phenomena were observed even though the Poynting flux associated with Alfven waves is directed outward. In this talk, we present the detailed mechanism how this counter-streaming accretion takes place. Alfven waves generated from a stellar surface are stochastically trapped in a transient density hole, and the magnetic pressure with the waves further dig the density hole. Eventually, this hole works as an efficient mirror against out-going Alfven waves. As a result, out-going waves are reflected and the reflected component excites counter streaming flow.