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VHF radio response of the Earth magnetosphere during solar activity growth in October 2003
Preliminary analysis of VHF radio background intensity observations at the middle latitude on frequency f=500 MHz with a help of ground radio telescope during the period from 14 to 26 October 2003 is presented. Data about electromagnetic radiation is compared with energetic particle fluxes in the interplanetary space and geostationary orbit.
The sporadic enhancement of VHF near Earth space radio background was observed either in pre mid night hours or at daytime. In many cases the short time increases of low energy electron, proton and ion fluxes by hundreds times in the interplanetary space have been corresponded to VHF radio bursts since 17 to 22 October. At the same time slow increasing of solar cosmic ray fluxes at point L1 and geostationary orbit during October 21-22 did not affected on the usual radio background level at a frequency 500 MHz. Just strong solar flare of 1B/X5.5 class on October 23 contributed to long-time enhancement of spectral radio intensity level including night sector of magnetosphere.
Suggestion is made that VHF radio bursts of the near Earth space can appear when the penetration processes of interplanetary low energy charge particles into plasmasphere occur.