Short-Wave Oscillations of Coronal Magnetic Arcades

Details Short-Wave Oscillations of Coronal Magnetic Arcades Short-Wave Oscillations of Coronal Magnetic Arcades

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006soph..237..123m&link_type=abstract

Solar Physics, Volume 237, Issue 1, pp.123-142

Physics

1

Scientific paper

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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