The electron scattering cross-section in incoherent backscatter

Details The electron scattering cross-section in incoherent backscatter The electron scattering cross-section in incoherent backscatter

Apr 1963

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963jatp...25..197g&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 25, no. 4, pp. 197-207

Physics

3

Scientific paper

Absolute measurements of the mean scattering cross-section of an electron in incoherent backscatter from the ionosphere have been carried out with an accurately calibrated radar. It is found that the measured cross-section at the F2-maximum exhibits a strong diurnal variation with a maximum value of about half the classical electron cross-section occurring during the night hours. This is in good agreement with the theoretically expected value for conditions of thermal equilibrium. During the daylight hours the measured cross-section is generally about 0.25 of the classical value. The lower daylight value indicates that in the presence of solar radiation the temperature of the electrons in the F-region can be up to three times the temperature of the positive ions. Some dependence of the excess electron temperature on height has also been found.

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