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Global Sausage Magnetoacoustic Modes of Coronal Loops

Published online by Cambridge University Press:  14 March 2005

V.M. Nakariakov ,
V.F. Melnikov  and
V.E. Reznikova
V.M. Nakariakov
Affiliation:
Physics Department, University of Warwick, Coventry, CV4 7AL, email: [email protected]
V.F. Melnikov
Affiliation:
Radiophysical Research Institute (NIRFI), Nizhny Novgorod, 603950, Russia, email: [email protected], [email protected]
V.E. Reznikova
Affiliation:
Radiophysical Research Institute (NIRFI), Nizhny Novgorod, 603950, Russia, email: [email protected], [email protected]
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Abstract

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A sufficiently thick and dense flaring magnetic loop is shown to be able to support global sausage magnetoacoustic modes. The oscillation period of this mode, calculated in the straight cylinder approximation, is determined by the length of the loop, not by its diameter, as it has previously been assumed. For the existence of this mode, the ratio of the loop length to its diameter is to be less than about a half of the square root of the density contrast ratio. This mode has a maximum of the magnetic field perturbation at the loop apex and nodes at the footpoints. We demonstrate that the 14-17 sec quasi-periodical pulsations of microwave emission, oscillating in phase at a loop apex and at its legs, as observed with the Nobeyama Radioheliograph, are interpreted in terms of the global sausage mode.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS223 , June 2004 , pp. 653 - 654
Copyright
© 2004 International Astronomical Union