Transverse oscillations in solar spicules induced by propagating Alfvenic pulses

The excitation of Alfvenic waves in the solar spicules due to the localized Alfvenic pulse is investigated. A set of incompressible MHD equations in two dimensional \(x-z\) plane with steady flows and sheared magnetic fields is solved. Stratification due to gravity and transition region between chro...

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Bibliographic Details
Published in:arXiv.org 2013-03
Main Authors: Ebadi, H, Hosseinpour, M, Fazel, Z
Format: Article
Language:English
Subjects:
Chromosphere
Damping
Fluid flow
Incompressible flow
Pulse propagation
Solar spicules
Spicules
Stratification
Transverse oscillation
Wave propagation
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Summary:The excitation of Alfvenic waves in the solar spicules due to the localized Alfvenic pulse is investigated. A set of incompressible MHD equations in two dimensional \(x-z\) plane with steady flows and sheared magnetic fields is solved. Stratification due to gravity and transition region between chromosphere and corona are taken into account. An initially localized Alfvenic pulse launched below the transition region can penetrate from transition region into the corona. We show that the period of transversal oscillations is in agreement with those observed in spicules. Moreover, it is found that the excited Alfvenic waves spread during propagation along the spicule length, and suffer efficient damping of the oscillations amplitude. The damping time of transverse oscillations elongated with decrease in k_b values.
ISSN:2331-8422
DOI:10.48550/arxiv.1303.0833