Alfvén Amplifier in the Solar Atmosphere

Youra Taroyan

Alfvén Amplifier in the Solar Atmosphere

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference Proceeding (Non-Journal item)

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.

Original language	English
Title of host publication	Multi-scale Dynamical Processes in Space and Astrophysical Plasmas, Astrophysics and Space Science Proceedings
Publisher	Springer Nature
Pages	123
ISBN (Print)	978-3-642-30441-5
Publication status	Published - 2012

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@inproceedings{b1f2d6fde02a4dd2b9c66305b3563e6d,

title = "Alfv{\'e}n Amplifier in the Solar Atmosphere",

abstract = "Since their discovery, Alfv{\'e}n 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 Alfv{\'e}nic disturbances that are generated at their footpoints through random convective motions. The amplification mechanism can be explained in terms of over-reflection of incompressible Alfv{\'e}nic disturbances in compressible plasma flows. The process does not require flow shear or super-Alfv{\'e}nic speeds. The implications of these results will be discussed in the context of recently observed large nonthermal velocities and associated blue-shifts.",

author = "Youra Taroyan",

note = "Multi-scale Dynamical Processes in Space and Astrophysical Plasmas, Astrophysics and Space Science Proceedings, Volume 33. ISBN 978-3-642-30441-5. Springer-Verlag Berlin Heidelberg, 2012, p. 123",

year = "2012",

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booktitle = "Multi-scale Dynamical Processes in Space and Astrophysical Plasmas, Astrophysics and Space Science Proceedings",

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T1 - Alfvén Amplifier in the Solar Atmosphere

AU - Taroyan, Youra

N1 - Multi-scale Dynamical Processes in Space and Astrophysical Plasmas, Astrophysics and Space Science Proceedings, Volume 33. ISBN 978-3-642-30441-5. Springer-Verlag Berlin Heidelberg, 2012, p. 123

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/2160/9917

M3 - Conference Proceeding (Non-Journal item)

SN - 978-3-642-30441-5

SP - 123

BT - Multi-scale Dynamical Processes in Space and Astrophysical Plasmas, Astrophysics and Space Science Proceedings

PB - Springer Nature

ER -

Alfvén Amplifier in the Solar Atmosphere

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