Accession Number : AD0689200

Title :   IONOSPHERIC RESEARCHES USING SATELLITES.

Descriptive Note : Final scientific rept. 1 Apr 68-31 Mar 69,

Corporate Author : PARIS UNIV (FRANCE) LABORATOIRE DE PHYSIQUE DE L'ATMOSPHERE

Personal Author(s) : Etienne,Vassy J.

Report Date : 15 APR 1969

Pagination or Media Count : 41

Abstract : With respect to the solar cycle, the variation of the total electron content (T.E.C.) at noon is not the same for the different seasons. Three parabolic relations are found, corresponding respectively to the winter, summer and equinoxes. Only two relations are found (one for summer and another for the equinoxes) when all diurnal maxima are considered, whatever be their time of occurence. A semi annual variation can be seen on the midday total electron content, the amplitude of which decreases when solar activity increases. There is a good correlation between this semi annual T.E.C. variation and the equivalent slab thickness variation. By studying the diurnal and seasonal variations of slab thickness and T.E.C. measurements, it is possible to deduce some ionospheric properties in function of the main geophysical parameters. It is not always possible to explain these different ionospheric properties in terms of recombinations governed by the local electronic temperature. It seems that the transport phenomena are more likely to give a valid explanation. (Author)

Descriptors :   (*IONOSPHERE, ELECTRON DENSITY), DIURNAL VARIATIONS, SOLAR ATMOSPHERE, INTENSITY, IONOSPHERIC DISTURBANCES, FRANCE, SCIENTIFIC SATELLITES

Subject Categories : Atmospheric Physics
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE