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f-mode interaction with models of sunspot: near-field scattering and multifrequency effects View all abstracts by submitter

Khalil Daiffallah   Submitted: 2016-06-07 05:55

We use numerical simulations to investigate the interaction of an f-mode wave packet with small and large models of a sunspot in a stratified atmosphere. While a loose cluster model has been largely studied before, we focus in this study on the scattering from an ensemble of tightly compact tubes. We showed that the small compact cluster produces a slight distorted scattered wave field in the transverse direction, which can be attributed to the simultaneous oscillations of the pairs of tubes within the cluster aligned in a perpendicular direction to the incoming wave. However, no signature of a multiple-scattering regime has been observed from this model, while it has been clearly observable for the large compact cluster model. Furthermore, we pointed out the importance of the geometrical shape of the monolithic model on the interaction of f-mode waves with a sunspot in a high-frequency range (ν = 5 mHz). These results are a contribution to the observational effort to distinguish seismically between different configurations of magnetic flux tubes within sunspots and plage.

Authors: K.Daiffallah
Projects: None

Publication Status: Published in MNRAS (2016), Volume 460, Issue 1, p.1077-1085
Last Modified: 2016-06-07 17:22
Go to main E-Print page  Long-Term Tracking of Corotating Density Structures using Heliospheric Imaging  On-line Tools for Solar Data Compiled in the Debrecen Observatory and their Extensions with the Greenwich Sunspot Data   Edit Entry  Download Preprint  Delete Entry 

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