Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13a2031s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13A-2031
Astronomy and Astrophysics
Astrophysics
[2471] Ionosphere / Plasma Waves And Instabilities, [2487] Ionosphere / Wave Propagation
Scientific paper
The scattering of high-frequency electromagnetic waves in a finite-beta plasma with developed interchange turbulence is considered. We first present the derivation of equations which describe linear and nonlinear stages of interchange instability in a finite-beta plasma in the presence of finite Larmor radius effects. Next the numerical solution of derived equations and spectra of excited interchange instability formed on the nonlinear stage will be presented. Based on these results, the scattering of high frequency electromagnetic waves on turbulence pulsations associated with the interchange instability will be considered. Two cases will be discussed. In the first case the exact solution of nonlinear equations which describe interchange instability will be used to calculate the scattering cross section within the framework of single-scattering perturbation theory. In the second case results of numerical solutions for plasma density and electric field perturbations have been used in the derived expressions for scattered wave energy and scattering cross section. This approach allows investigation of the scattering processes when representation of excited density and wave field turbulence in analytical form is difficult to obtain. Obtained results can be used in ionospheric propagation models, high energy density physics (HEDP) applications, and for interpretation of high energy density laboratory astrophysics (HEDLA) experimental results.
Himed B.
Mehlhorn T. A.
Ng Cindy
Oliver Bob
Paraschiv I.
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