A theory for the radiation of magnetohydrodynamic surface waves and body waves into the solar corona

Details A theory for the radiation of magnetohydrodynamic surface waves and body waves into the solar corona A theory for the radiation of magnetohydrodynamic surface waves and body waves into the solar corona

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332.1076d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. 1076-1089.

Astronomy and Astrophysics

Astrophysics

2

Coronal Holes, Green'S Functions, Magnetohydrodynamic Waves, Solar Corona, Surface Waves, Coronal Loops, Low Frequencies, Solar Atmosphere, Solar Wind

Scientific paper

The Green's function for the slab coronal hole is obtained explicitly. The Fourier integral representation for the radiated field inside and outside the coronal hole waveguide is obtained. The radiated field outside the coronal hole is calculated using the method of steepest descents. It is shown that the radiated field can be written as the sum of two contributions: (1) a contribution from the integral along the steepest descent path and (2) a contribution from all the poles of the integrand between the path of the original integral and the steepest descent path. The free oscillations of the waveguide can be associated with the pole contributions in the steepest descent representation for the Green's function. These pole contributions are essentially generalized surface waves with a maximum amplitude near the interface which separates the plasma inside the coronal hole from the surrounding background corona. The path contribution to the integral is essentially the power radiated in body waves.

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