Accession Number : ADP006490
Title : The Physics of Ground Based Heating,
Corporate Author : LEICESTER UNIV (UNITED KINGDOM)
Personal Author(s) : Jones, T. B.
Report Date : OCT 1990
Pagination or Media Count : 9
Abstract : The first indication that powerful radiowaves could modify the earth's ionosphere was the discovery of the Luxembourg Effect in 1933, (Tellegen, 1933). The transfer of the modulation of the high power Luxembourg broadcasts on to weaker signals propagating through the same region of the ionosphere could only be explained in terms of ionospheric cross modulation (Bailey & Martyn, 1934). The ionospheric electron temperature and hence its electron density, were changed by the high power wave and these subsequently influenced other radio signals propagated through the 'modified' region. In the early 1970s, it was realized that high power radio waves could produce a many instabilities in the ionosphere in addition to the collision phenomena associated with the Luxembourg effect. These instabilities have a wide range of spatial and temporal scales and a number of heating facilities were specially built both in the West and in the Soviet Union, to study their characteristics. Special issues of a number of journals have been exclusively devoted to heating results, eg. J.Geophys.Res. 1970, Radio Science 1974, J.Atmos.Terr.Phys. 1982 and 1985.
Descriptors : *LUXEMBURG EFFECT, *IONOSPHERIC DISTURBANCES, COLLISIONS, ELECTRON DENSITY, HEATING, HIGH POWER, POWER, RADIO SIGNALS, RADIO WAVES, REGIONS, CROSS MODULATION, ELECTRON ENERGY, ENERGY TRANSFER.
Subject Categories : Atmospheric Physics
Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE