Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125..371l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 2, Sept. 1983, p. 371-374.
Astronomy and Astrophysics
Astrophysics
11
Magnetohydrodynamic Waves, Solar Atmosphere, Wave Propagation, Flux Density, Maxwell Equation, Wave Equations, Wentzel-Kramer-Brillouin Method
Scientific paper
If the solar atmosphere is modelled by a medium with a (possibly piece-wise) exponentially decreasing density, permeated by a uniform magnetic field, for MHD waves with a period ranging between a few seconds and several hours the WKBJ approximation is nowhere valid. Consequently, the concept of travelling wave is no longer meaningful and difficulties arise concerning the boundary condition that there be no incoming wave from infinity. In the past, these have been circumvented by confining arbitrarily the inhomogeneous medium to a region of finite extension. In the present paper the author proposes an alternative solution devoid of this free parameter; it simply consists in not discarding the displacement current in Maxwell's equations.
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