MHD disturbances in a coronal potential arcade generated by localized perturbers.

Details MHD disturbances in a coronal potential arcade generated by localized perturbers. MHD disturbances in a coronal potential arcade generated by localized perturbers.

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296..537c&link_type=abstract

Astronomy and Astrophysics, v.296, p.537

Astronomy and Astrophysics

Astrophysics

7

Mhd, Sun: Corona, Magnetic Fields

Scientific paper

We present an analytical approach which combines Fourier and Laplace transformations to solve the two dimensional boundary value problem of the linear wave excitation in the solar corona by a distinct periodic perturber localized at an arbitrary surface. Due to the physical properties of the corona, we consider a magnetic configuration such as a potential arcade. Depending on the shape of the coronal potential magnetic arcade, the surface on which the perturber is located can be the photosphere itself, the magnetic field surface or any other surface connecting two foot-lines of the arcade which is in a magneto-hydrostatic equilibrium with the surrounding plasma. We do not consider Alfven waves and since the slow mode is absent in a potential arcade, the excited waves are, then, the fast magneto-acoustic modes causing fluid motions in the direction perpendicular to the magnetic field in the cross sectional plane of the arcade. We give a particular example wich deals with a magnetic arcade whose characteristic magnetic field scale length is twice the isothermal scale height of the coronal plasma. The boundary conditions are imposed at the photosphere, in the form of periodic perturbers with various strength distributions along the horizontal direction.The results show a feature of wave channeling which certainly is an effect of interest in coronal heating mechanisms.

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