Accession Number : AD0428954

Title :   ON THE DETERMINATION OF TEMPERATURE AND IONIC COMPOSITION BY ELECTRON BACKSCATTERING FROM THE IONOSPHERE AND MAGNETOSPHERE,

Corporate Author : STANFORD UNIV CALIF STANFORD ELECTRONICS LABS

Personal Author(s) : Moorcroft,D. R.

Report Date : OCT 1963

Pagination or Media Count : 32

Abstract : Observations of the scattering of electromagnetic waves from thermal fluctuations in the electron density of the ionosphere and magnetosphere have previously been used to investigate ion and electron temperatures and the electron density. This work was based on the assumptions that the only ions present were O(+), and that kD = 4piD/lambda sub T is much less than 1 (lambda sub T is the transmitted wavelength and D is the Debye length). These conditions usually apply at F-region heights. The interpretation of such scattering is extended to conditions likely to apply above the F region, where increasing percentages of He(+) and H(+) are expected to occur, and where kD may not be very small. Detailed curves are presented for mixtures of O(+) and He(+). It appears that, with a sufficiently powerful radar operating at a sufficiently low frequency, scatter observations alone can usually be used to determine the relative concentrations of O(+) and He(+) (and/or H(+)), as well as the electron and ion temperatures and the electron density. When information on one or more of these ionospheric properties is available from another source, simpler scatter observations can be used to complete the set. A simple transformation is given which accurately corrects the interpretation for values of kD up to unity. (Author)

Descriptors :   (*IONS, TEMPERATURE), ELECTRON DENSITY, IONOSPHERE, SCATTERING, OXYGEN, HELIUM, HYDROGEN

Distribution Statement : APPROVED FOR PUBLIC RELEASE