Sporadic radio emission in the near Earth space on the eve of the 23rd cycle of solar activity

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Scientific paper

Results of the measurements of the high frequency sporadic radio emission from the Earth's magnetosphere before the maximum of the 23rd solar activity cycle are discussed. The radio noise level and burst density at a frequency of 150 MHz are compared with the solar and magnetospheric activity from 20 July to 16 August 1999. It is shown that those solar flares which are accompanied by big ejections of low-energy particles and plasma instabilities are most efficient in the generation of sporadic radio bursts. The radio noise bursts showed good correlation with the dynamics of energetic electrons at heights of geostationary satellites, with a time delay of some hours between the maxima of both processes. The bursts which are observed, as a rule, during 2-3 hours are suggested to be generated in the inner layers of the magnetosphere after the radial diffusion of energetic electrons from the outer magnetosphere.

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