Fine structure of the high-latitude ionosphere in the cleft and cusp

Details Fine structure of the high-latitude ionosphere in the cleft and cusp Fine structure of the high-latitude ionosphere in the cleft and cusp

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55.1529b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 11-12, p. 1529-1535.

Computer Science

Sound

Ionospheric Drift, Ionospheric Sounding, Magnetosphere-Ionosphere Coupling, Polar Regions, Doppler Radar, F Region, Particle Precipitation, Radar Signatures

Scientific paper

The results of studies of the fine structure and dynamic processes in the high-latitude ionosphere in the cleft and cusp region by the data of complex radiophysical observations on high-latitudinal paths are presented. They are based on experimental material obtained on board the research vessel 'Professor Vize' during July-September 1990 when the vessel was at the Greenwich meridian and the latitudes 75-78 deg N. The distinctive feature of the radiophysical observations on the vessel was the simultaneous observations by the Doppler method at two fixed frequencies in the decameter range and by the method of oblique sounding of the ionosphere at a frequency sweeping the range from 3.5 to 27.5 MHz. From the observations, the typical feature of the cleft and the cusp has been found to be the presence of wave processes of various periods from 30-40 s to 3-8 min. It is suggested that the emergence of typical negative tracks on the dynamic spectra of HF signals is related to the ionospheric manifestations of flux transfer events.

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