Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...351.1165a&link_type=abstract
Astronomy and Astrophysics, v.351, p.1165-1189 (1999)
Astronomy and Astrophysics
Astrophysics
4
Sun: Radio Radiation, Scattering, Radiative Transfer
Scientific paper
The present work investigates the propagation of a radio pulse in an unmagnetized, statistically inhomogeneous plasma causing regular refraction and anisotropic scattering. Using the framework of geometrical optics, a Fokker-Planck equation is derived and integrated within a two-moment approximation. The method allows a continuous transition from weak to strong angular scattering and yields pulse shape, pulse delay and angular broadening detected by a distant observer. The results are compared to Monte Carlo simulations and the method is applied to coronal scattering of a burst emitted close to the local plasma frequency. It is shown that the two-moment approximation reproduces many of the features found in earlier simulations (Steinberg et al. \cite{Steinberg}, Riddle \cite{Riddle2}) within a small fraction of needed computation time. Although the method was developed for solar radio bursts, it can be applied to general transport-diffusion problems due to the equivalence of geometrical optics and Hamiltonian mechanics.
Arzner Kaspar
Magun Andreas
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