Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.272..682c&link_type=abstract
Nature, vol. 272, Apr. 20, 1978, p. 682-686. Research supported by the Science Research Council, Centre National d'Etudes des Te
Physics
16
Atmospherics, Earth Magnetosphere, Electrostatic Waves, Geos 1 Satellite, Plasma Diagnostics, Cyclotron Radiation, Hot Electrons, Plasma Frequencies, Plasma Probes, Plasma Resonance
Scientific paper
In connection with a failure of the Delta launcher, Geos I, the ESA magnetospheric research satellite launched on April 20, 1977, did not achieve the intended geostationary orbit. The satellite was subsequently maneuvered into a 12-hr orbit with a perigee of 2,000 km and an apogee of 40,000 km. Although the research program in its original form could not be conducted, there have been new study possibilities as a result of the changed orbit. A description is presented of data which make it possible to answer, with reasonable precision several questions about the electrostatic wave emissions observed by earlier spacecraft. Attention is given to rather weak emissions which show a pronounced banded structure close to the local plasma frequency. The reported data were obtained with the aid of the 'passive' natural wave detector and the two 'active' wave experiments which provide important diagnostic measurements of the basic plasma parameters.
Béghin Christian
Bloch Jacqueline
Christiansen Per
Cornilleau Nicole
Décréau Pierrette
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