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Interpretation of James' Experiments in Plasma Theory of Solar Radar Echoes

Published online by Cambridge University Press:  26 May 2016

V.N. Mel'nik
V.N. Mel'nik*
Affiliation:
Institute of Radio Astronomy, Krasnoznamyonnaya St.4, 310002, Kharkov, Ukraine

Abstract

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In the framework of the plasma theory of solar radar echoes results of the known James' experiments such as the values of effective cross-sections, the anisotropy of reflections, the spectrum of reflected signals, the heights of radar scattering and others are explained. In particular in this theory reflection of radar signal with high effective cross-sections (σ = (10 − 100)πR2⊙) occur in processes t + l ⇌ t + l on the Langmuir turbulance generated by Type III electrons at altitudes (1.4—1.6)-R⊙ when electron streams propagate towards the Earth. If the electrons move away from the Earth then the scattering cross-sections due to process t + l ⇌ t + l are small (σ < πR2⊙). Reflections from the heights up to 5R⊙ can occur at scattering of radar wave on the ion-sound turbulance (processes t + s ⇌ t) accompanied the Langmuir turbulance.

Type
Part 8: Sun and Planetary Systems
Information
Symposium - International Astronomical Union , Volume 199: The Universe at Low Radio Frequencies , 2002 , pp. 434 - 436
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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