Alfvén Amplifier in the Solar Atmosphere

Conference paper
Part of the Astrophysics and Space Science Proceedings book series (ASSSP, volume 33)

Abstract

Since their discovery, Alfvén waves have been studied in relation to the formation of spicules, the acceleration of the solar wind and the heating of the solar atmospehre. It is shown that under certain conditions magnetic flux tubes become amplifiers of Alfvénic disturbances that are generated at their footpoints through random convective motions. The amplification mechanism can be explained in terms of over-reflection of incompressible Alfvénic disturbances in compressible plasma flows. The process does not require flow shear or super-Alfvénic speeds. The implications of these results will be discussed in the context of recently observed large nonthermal velocities and associated blue-shifts.

Keywords

Solar Wind Flux Tube Solar Atmosphere Magnetic Flux Tube Uniform Part 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.IMAPS, Aberystwyth UniversityWalesUK

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