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Seismology of Standing Kink Oscillations of Solar Prominence Fine Structures View all abstracts by submitter

Roberto Soler   Submitted: 2010-07-13 03:55

Damped transverse oscillations of solar prominence fine structures are frequently reported and have been interpreted as kink magnetohydrodynamic (MHD) modes. Here, we investigate standing kink MHD oscillations in a prominence fine structure. Our model is composed of a magnetic tube only partially filled with the prominence material, while the coronal plasma occupies both the rest of the tube and the external medium. Ion-neutral collisions and resonant absorption are the considered damping mechanisms. Approximate analytical expressions of the period, the damping time, and the ratio of the damping time to the period are derived for the fundamental kink mode. A parametric study is performed by numerically solving the full dispersion relation. We find that the dominant damping mechanism is resonant absorption, which provides realistic damping ratios, whereas ion-neutral collisions are irrelevant for the damping. The values of the damping ratio are independent of both the prominence thread length and its position within the magnetic tube, and coincide with the values for a tube fully filled with the prominence plasma. The implications of our results in the context of the MHD seismology technique are discussed, pointing out that the reported short-period (2 - 10 min) and short-wavelength (700 - 8,000 km) thread oscillations may not be consistent with a standing mode interpretation and could be related to propagating waves. Finally, we show that the inversion of some prominence physical parameters, e.g., Alfvén speed, magnetic field strength, transverse inhomogeneity length-scale, etc., is possible using observationally determined values of the period and damping time of the oscillations along with the analytical approximations of these quantities.

Authors: R. Soler, I. Arregui, R. Oliver, and J. L. Ballester
Projects: None

Publication Status: Submitted in ApJ
Last Modified: 2010-07-13 12:29
Go to main E-Print page  	 	Excitation of vertical kink waves in a solar coronal arcade loop by a periodic driver  Multiwavelength imaging and spectroscopy of chromospheric evaporation in an M-class solar flare  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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