Accession Number : AD0653930

Title :   SUR L'ETUDE DE L'AMPLITUDE DU CHAMP RADIOELECTRIQUE D'UN SATELLITE A L'HORIZON DE LA STATION (ON THE STUDY OF THE AMPLITUDE OF THE RADIOELECTRIC FIELD OF A SATELLITE AT THE HORIZON OF THE STATION),

Corporate Author : ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT PARIS (FRANCE)

Personal Author(s) : Aurejac,J. F. ; Papet-Lepine,J.

Report Date : 1966

Pagination or Media Count : 34

Abstract : Using a 40 Mc/s high gain aerial which can be pointed in all directions of azimuth, the Val-Joyeux station can receive signals from the satellite 'Explorer 22' for all revolutions from 330 degrees to 206 degrees of longitude W when passing over the Equator. In extreme cases this represents a distance between the satellite and the observer which is sometimes more than 5,000 km. Because of a very long journey in the ionosphere, it is possible to show a considerable increase in the refraction effects and in the effect of irregularities in the distribution of the electron density in the environment traversed. Thus a large increase in scintillations is observed when the angle of elevation is approximately 20 degrees or less. This increase in scintillations is particularly noticeable towards the North, but also towards the South. In the latter case some correlation between magnetic activity and the scintillation coefficients has been observed. A systematic comparison with the results obtained by other stations is then made to define the areas giving rise to such scintillations. (Author)

Descriptors :   (*RADIO TRANSMISSION, SCIENTIFIC SATELLITES), VERY HIGH FREQUENCY, IONOSPHERIC PROPAGATION, SCINTILLATION, ATMOSPHERIC REFRACTION, ELECTRON DENSITY, FRANCE

Subject Categories : Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE