Short-Wave Oscillations of Coronal Magnetic Arcades |
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| Authors: | B B Mikhalyaev |
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| Institution: | (1) Department of Theoretical Physics, Kalmyk State University, Elista, 358000, Russia |
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| Abstract: | We investigate MHD waves in potential and force-free magnetic arcades describing bipolar active regions. The eikonal method
allows us to study analytically the short waves, which are divided into Alfvén and magnetosonic waves. The eigen-modes of
magnetic arcades are formed as a result of their reflection at the photosphere. The Alfvén mode oscillations of a certain
frequency take place on magnetic surfaces. The fast-mode oscillations also take place on some surfaces but they are not magnetic
surfaces. Both the Alfvén and fast-mode eigen-frequencies change continuously from one such surface to another. Each oscillation
surface has a discrete set of eigen-frequencies. |
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