The efficiency of four-plasmon interactions in the reflection of a radar signal from the sun

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electromagnetic Scattering, Plasma Turbulence, Plasmons, Radar Astronomy, Solar Corona, Solar Radar Echoes, Ion Acoustic Waves, Isotropic Media, Plasma-Electromagnetic Interaction, Scattering Cross Sections

Scientific paper

An investigation of electromagnetic scattering by plasma turbulence pulsations of the solar corona providing required power for the radar echo is presented. Expressions for an effective scattering cross-section were derived for two cases: (1) for an electromagnetic wave scattered by Langmuir turbulence of an isotropic plasma, and (2) for a wave scattered on ion-acoustic waves. The numerical estimates show that four-plasmon interactions of the electromagnetic radiation and the coronal turbulent pulsations can account for the results of the radar observations of the sun.

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