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Alfvén waves in a gravitational field with flows

Published online by Cambridge University Press:  01 September 2008

A. Satya Narayanan ,
C. Kathiravan  and
R. Ramesh
A. Satya Narayanan
Affiliation:
Indian Institute of AstrophysicsKoramangala II BLock, Bangalore - 560 034, India email: satya@iiap.res.in
C. Kathiravan
Affiliation:
Indian Institute of AstrophysicsKoramangala II BLock, Bangalore - 560 034, India email: satya@iiap.res.in
R. Ramesh
Affiliation:
Indian Institute of AstrophysicsKoramangala II BLock, Bangalore - 560 034, India email: satya@iiap.res.in
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Abstract

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The gravitational stratification effect on magnetohydrodynamic waves at a single interface in the solar atmosphere has been studied in the penumbral region of the sunspot recently. The existence of slow and fast magneto acoustic gravity waves and their characteristics has been discussed. The effect of flows on magneto acoustic gravity surface waves leads to modes called flow modes or v-modes. The present geometry is that of a plasma slab moving with uniform velocity surrounded by a plasma of different density. As is applicable to the corona, we assume that the plasma β to be small. The dispersion characteristics change significantly with a change in the value of G (gravity) and uniform flow.

Keywords

Sun: Oscillations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S257: Universal Heliophysical Processes , September 2008 , pp. 563 - 568
Copyright
Copyright © International Astronomical Union 2009

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