Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981lastr..95..173b&link_type=abstract
L'Astronomie, vol. 95, Apr. 1981, p. 173-189. In French.
Astronomy and Astrophysics
Astronomy
Decametric Waves, Jupiter (Planet), Planetary Radiation, Radio Emission, Radio Sources (Astronomy), Io, Radiant Flux Density, Radiation Sources, Radio Astronomy, Radio Bursts, Solar Activity Effects
Scientific paper
A 12 year observation program is planned to cover a revolution of Jupiter and a solar activity cycle. Sporadic very intense bursts lasting a second-millisecond are observed with storms of several hours or minutes. Signals are over broad band with drift to higher or lower frequencies (5-40 MHz with peaks of 18-22 MHz). Four radio sources are observed showing symmetry in pairs in relation to magnetic field axis and Io. There is a fifth independent source. Amplitudes are determined by Jupiter flux density and terrestrial ionosphere permeability - a function of solar activity. Signal storm length relates to position of Io and is at maximum when source is on Jupiter central meridian and Io at determined angle. The independent source is not well understood and Io's role is not clear. The satellite may trigger emissions or even be emitter.
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