Physics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4...61v&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 4, Feb. 1986, p. 61-68.
Physics
1
Auroral Zones, F Region, Ionospheric Disturbances, Space Plasmas, Ionospheric Electron Density, Plasma Probes, Power Spectra, Radar Echoes, Spaceborne Experiments
Scientific paper
Simultaneous observations of F-region ionospheric irregularities have been performed with the SAFARI ground-based HF radars and the ISOPROBE experiment on board the AUREOL-3 satellite. Among seven orbits during which the satellite trajectory was directly in the radar beam or in the vicinity, four of them have been analyzed in detail. The spectral power of the electron density variations Delta-N(e)/N(e) has been calculated for wavelengths between 20 m and 1 km from the ISOPROBE high time resolution thermal plasma measurements. One spectrum is obtained every 1.2 s, a time which corresponds to about 10 km along the satellite trajectory. The presence of echoes observed in the F-region with the SAFARI radars is compared with the spectral power of the electron density variations deduced from the ISOPROBE in situ measurements. A good agreement is found between the two sets of observations and a numerical value of the spectral power corresponding to detection of echoes by the radar is given. A synoptic view of the event is given and interpreted according to the existing theories of plasma irregularities.
Béghin Christian
Hanuise Ch.
Villain Jean-Paul
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