Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.275..111p&link_type=abstract
Nature, vol. 275, Sept. 14, 1978, p. 111-113. Research sponsored by the Centre National d'Etudes Spatiales.
Astronomy and Astrophysics
Astronomy
9
Beams (Radiation), Decametric Waves, Jupiter (Planet), Planetary Radiation, Radio Astronomy, Electromagnetic Radiation, French Space Program, High Frequencies, Io, Pencil Beams, Phase Deviation, Signal Detection, Telemetry, U.S.S.R. Space Program, Jupiter, Radiation, Observations, Radioemissions, Decameter Waves, Io, Satellites, Wavelengths, L-Bursts, Position (Location), Mars 7, Flux, Spectrum, Megahertz, Density
Scientific paper
Evidence that Jupiter's decametric radiation is emitted in a very narrow pencil beam, perhaps as narrow as a few degrees, was obtained by coordinating earth and Mars 7 measurements of the radio emission. The emission occurrence probability is a function of the observer's position with respect to the relative positions of Jupiter and Io, the innermost satellite. Examination of 30-MHz recordings obtained during periods free of solar activity shows that on March 23, 1974 Jupiter was recorded on the earth and not on the probe, while the opposite situation occurred May 15, 1974. Data for other frequencies are examined, and the relation between Io and the direction of emission is considered.
Lecacheux Alain
Poquerusse P.
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