Numerical Simulations of Torsional Alfvén Waves in Axisymmetric Solar Magnetic Flux Tubes

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• 作者：D. Wójcik ; K. Murawski ; Z. E. Musielak ; P. Konkol ; A. Mignone
• 关键词：Waves ; Alfvén
• 刊名：Solar Physics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：292
• 期：2
• 全文大小：1808KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Astrophysics and Astroparticles; Atmospheric Sciences; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics);
• 出版者：Springer Netherlands
• ISSN：1573-093X
• 卷排序：292

文摘

We numerically investigate Alfvén waves propagating along an axisymmetric and non-isothermal solar flux tube embedded in the solar atmosphere. The tube magnetic field is current-free and diverges with height, and the waves are excited by a periodic driver along the tube magnetic field lines. The main results are that the two wave variables, the velocity and magnetic field perturbations in the azimuthal direction, behave differently as a result of gradients of the physical parameters along the tube. To explain these differences in the wave behavior, the time evolution of the wave variables and the resulting cutoff period for each wave variable are calculated and used to determine regions in the solar chromosphere where strong wave reflection may occur.