Resonant conversion of standing acoustic oscillations into alfven wabes in the beta~1 region of the solar atmosphere

David Kuridze; T. V. Zaqarashvili; B. Roberts

Resonant conversion of standing acoustic oscillations into alfven wabes in the beta~1 region of the solar atmosphere

David Kuridze, T. V. Zaqarashvili, B. Roberts

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference Proceeding (ISBN)

Abstract

We show that 5-minute acoustic oscillations may resonantly convert into Alfv{\'e}n waves in the β∼1 region of the solar atmosphere. Considering the 5-minute oscillations as pumping standing acoustic waves oscillating along unperturbed vertical magnetic field, we find on solving the ideal MHD equations that amplitudes of Alfv{\'e}n waves with twice the period and wavelength of acoustic waves exponentially grow in time when the sound and Alfv{\'e}n speeds are equal, i.e. cs≈vA. The region of the solar atmosphere where this equality takes place we call a {\it swing layer}. The amplified Alfv{\'e}n waves may easily pass through the chromosphere and transition region carrying the energy of p-modes into the corona

Original language	English
Title of host publication	Proceedings of the 11th European Solar Physics Meeting
Subtitle of host publication	"The Dynamic Sun: Challenges for Theory and Observations
Editors	D. Danesy, S. Poedts, A. De Groof, J. Andries
Publication status	Published - Dec 2005
Event	11th European Solar Physics Meeting: "The Dynamic Sun: Challenges for Theory and Observations" - Leuven, Belgium Duration: 11 Sept 2005 → 16 Sept 2005

Conference

Conference	11th European Solar Physics Meeting
Abbreviated title	ESA SP-600
Country/Territory	Belgium
City	Leuven
Period	11 Sept 2005 → 16 Sept 2005

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title = "Resonant conversion of standing acoustic oscillations into alfven wabes in the beta\textasciitilde{}1 region of the solar atmosphere",

abstract = "We show that 5-minute acoustic oscillations may resonantly convert into Alfv\{\textbackslash{}'e\}n waves in the β∼1 region of the solar atmosphere. Considering the 5-minute oscillations as pumping standing acoustic waves oscillating along unperturbed vertical magnetic field, we find on solving the ideal MHD equations that amplitudes of Alfv\{\textbackslash{}'e\}n waves with twice the period and wavelength of acoustic waves exponentially grow in time when the sound and Alfv\{\textbackslash{}'e\}n speeds are equal, i.e. cs≈vA. The region of the solar atmosphere where this equality takes place we call a \{\textbackslash{}it swing layer\}. The amplified Alfv\{\textbackslash{}'e\}n waves may easily pass through the chromosphere and transition region carrying the energy of p-modes into the corona",

author = "David Kuridze and Zaqarashvili, \{T. V.\} and B. Roberts",

year = "2005",

month = dec,

language = "English",

editor = "D. Danesy and S. Poedts and \{De Groof\}, A. and J. Andries",

booktitle = "Proceedings of the 11th European Solar Physics Meeting",

note = "11th European Solar Physics Meeting : {"}The Dynamic Sun: Challenges for Theory and Observations{"}, ESA SP-600 ; Conference date: 11-09-2005 Through 16-09-2005",

}

Kuridze, D, Zaqarashvili, TV & Roberts, B 2005, Resonant conversion of standing acoustic oscillations into alfven wabes in the beta~1 region of the solar atmosphere. in D Danesy, S Poedts, A De Groof & J Andries (eds), Proceedings of the 11th European Solar Physics Meeting: "The Dynamic Sun: Challenges for Theory and Observations. 11th European Solar Physics Meeting, Leuven, Belgium, 11 Sept 2005.

Resonant conversion of standing acoustic oscillations into alfven wabes in the beta~1 region of the solar atmosphere. / Kuridze, David; Zaqarashvili, T. V.; Roberts, B.
Proceedings of the 11th European Solar Physics Meeting: "The Dynamic Sun: Challenges for Theory and Observations. ed. / D. Danesy; S. Poedts; A. De Groof; J. Andries. 2005.

Research output: Chapter in Book/Report/Conference proceeding › Conference Proceeding (ISBN)

TY - GEN

T1 - Resonant conversion of standing acoustic oscillations into alfven wabes in the beta~1 region of the solar atmosphere

AU - Kuridze, David

AU - Zaqarashvili, T. V.

AU - Roberts, B.

PY - 2005/12

Y1 - 2005/12

N2 - We show that 5-minute acoustic oscillations may resonantly convert into Alfv{\'e}n waves in the β∼1 region of the solar atmosphere. Considering the 5-minute oscillations as pumping standing acoustic waves oscillating along unperturbed vertical magnetic field, we find on solving the ideal MHD equations that amplitudes of Alfv{\'e}n waves with twice the period and wavelength of acoustic waves exponentially grow in time when the sound and Alfv{\'e}n speeds are equal, i.e. cs≈vA. The region of the solar atmosphere where this equality takes place we call a {\it swing layer}. The amplified Alfv{\'e}n waves may easily pass through the chromosphere and transition region carrying the energy of p-modes into the corona

AB - We show that 5-minute acoustic oscillations may resonantly convert into Alfv{\'e}n waves in the β∼1 region of the solar atmosphere. Considering the 5-minute oscillations as pumping standing acoustic waves oscillating along unperturbed vertical magnetic field, we find on solving the ideal MHD equations that amplitudes of Alfv{\'e}n waves with twice the period and wavelength of acoustic waves exponentially grow in time when the sound and Alfv{\'e}n speeds are equal, i.e. cs≈vA. The region of the solar atmosphere where this equality takes place we call a {\it swing layer}. The amplified Alfv{\'e}n waves may easily pass through the chromosphere and transition region carrying the energy of p-modes into the corona

M3 - Conference Proceeding (ISBN)

BT - Proceedings of the 11th European Solar Physics Meeting

A2 - Danesy, D.

A2 - Poedts, S.

A2 - De Groof, A.

A2 - Andries, J.

T2 - 11th European Solar Physics Meeting

Y2 - 11 September 2005 through 16 September 2005

ER -

Resonant conversion of standing acoustic oscillations into alfven wabes in the beta~1 region of the solar atmosphere

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