Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192..354b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 354-359. AAS-supported research.
Astronomy and Astrophysics
Astronomy
14
Interplanetary Magnetic Fields, Jupiter (Planet), Magnetospheres, Radio Emission, Solar Wind, Voyager Project, Radio Sources (Astronomy), Voyager 1 Spacecraft, Voyager 2 Spacecraft, Jupiter, Solar Wind, Kilometer Waves, Radio Waves, Emissions, Comparisons, Spacecraft Observations, Density, Pressure, Magnetic Fields, Frequencies, Magnitude, Energy, Satellites, Io, Torus, Beaming, Electrons, Spectra, Magnetosphere, Pra Instrument, Pls Instrument, Mag Instrument, Analysis, Models, Source, Imf
Scientific paper
Observations of the solar wind close to Jupiter are compared with the broad-band kilometric radio emission (bKOM), using data recorded by Voyager 1 and Voyager 2 during 1979. The lower bKOM frequencies, less than about 300 kHz, are found to correlate with the solar wind density and pressure and with the interplanetary magnetic field (IMF) magnitude during periods when there is a well-defined magnetic sector structure. The results suggest that lower frequency bKOM events are most likely to occur after a sector boundary has passed Jupiter during the period when the solar wind density and the IMF magnitude are increasing towards the sector center. The average bKOM energy per Jovian rotation tends to have lower values soon after the sector center has passed. Higher-frequency/higher-energy bKOM emission may be contaminated by hectometric emission (HOM) and differently correlated with solar activity. The solar wind control may also be obscured by some stronger control. It is suggested that electron density fluctuations in the Io torus, where the source is believed to be located, may be responsible for variations in the beaming and hence variations in the observed emission.
Barrow Colin H.
Desch Michael D.
Leblanc Yolanda
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