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  • LUNAR AND PLANETARY EXPLORATION  (8)
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  • 1
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    Radio observations of the Jovian magnetic field (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Radio observations of Jupiter are reviewed and discussed in relation to the planet's magnetic field. Early ground-based decameter- and decimeter-wave observations lead to a first estimate of the magnetic field strength which was subsequently confirmed by space-borne measurements. Decametric, hectometric and decimetric measurements of the Jovian rotation period offer the possibility of detecting a real change in the magnetic field structure within the next few decades. Solar wind control of the radio emission allows inferences to be made concerning the magnetic field and the emission regions at decametric, hectometric and kilometric frequencies. The decametric and the hectometric radiation may originate in hollow-cone emission sources at high (auroral) latitudes on Jupiter. The broad-band kilometric emission appears to originate at the outer edge of the Io torus.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Advances in Space Research (ISSN 0273-1177); 12; 8, Au; 155-164
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  • 2
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    Solar wind control of Jupiter's decametric radio emission (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Observations of the solar wind close to Jupiter are compared with the decametric radio emission (DAM), using data recorded by Voyager 1 and Voyager 2 during 1979. The Non-Io DAM, recorded by both spacecraft and combined using the superposed epoch technique, is found to correlate with the solar wind density and velocity, as well as with the interplanetary magnetic field (IMF) magnitude. In agreement with earlier work using ground-based observations, there are indications that the Non-Io DAM is somehow associated with magnetic sector structure although the precise details of the relationship are still not known and it is not clear if this is a fundamental effect or some secondary effect of intercorrelation.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 165; 1-2,
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  • 3
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    The solar wind control of Jupiter's broad-band kilometric radio emission (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: 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.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 192; 1-2,; 354-359
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  • 4
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    Maximum frequency of the decametric radiation from Jupiter (1980)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The upper frequency limits of Jupiter's decametric radio emission are found to be essentially the same when observed from the earth or, with considerably higher sensitivity, from the Voyager spacecraft close to Jupiter. This suggests that the maximum frequency is a real cut-off corresponding to a maximum gyrofrequency of about 38-40 MHz at Jupiter. It no longer appears to be necessary to specify different cut-off frequencies for the Io and non-Io emission as the maximum frequencies are roughly the same in each case.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomy and Astrophysics; 90; 1-2,; Oct. 198
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  • 5
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    Non-Io decametric radiation from Jupiter at frequencies above 30 MHz (1980)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Jovian Non-Io decametric radio events extending to frequencies of 30 MHz and above have been found in the Meudon-Nancay observations during 1978 and 1979, in the Voyager 1 PRA observations during February and March, 1979 and in the University of Colorado Radio Astronomy Observatory catalogue for 1960 to 1975. These events, which appear to be mostly associated with the Jovian A-source, query the existence of a cut-off, a little below 30 MHz, for the Non-Io emission and suggest the possibility of a single mechanism for both the Io and the Non-Io radiation.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomy and Astrophysics; 86; 3, Ju; June 198
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  • 6
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    Direct evidence for solar wind control of Jupiter's hectometer-wavelength radio emission (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Observations of the solar wind close to Jupiter by the Voyager 1 and Voyager 2 spacecraft in 1978 and 1979 are compared with the hectometer-wavelength radio emission from the planet. A significant positive correlation is found between variations in the solar wind plasma density at Jupiter and the level of Jovian radio emission output. During the 173-day interval studied for the Voyager 2 data the radio emission displayed a long-term periodicity of about 13 days, identical to that shown by the solar wind density at Jupiter and consistent with the magnetic sector structure association already proposed for ground-based observations of the decameter-wavelength emission.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 6819-682
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  • 7
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    Direct evidence for solar wind control of Jupiter's hectometer-wavelength radio emission (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Observations of the solar wind close to Jupiter, by the Voyager 1 and Voyager 2 spacecraft in 1978 and 1979, are compared with the hectometer wavelength radio emission from the planet. A significant positive correlation is found between variations in the solar wind plasma density at Jupiter and the level of Jovian radio emission output. During the 173-day interval studied for the Voyager 2 data, the radio emission displayed a long term periodicity of about 13 days, identical to that shown by the solar wind density at Jupiter and consistent with the magnetic sector structure association already proposed for groundbased observations of the decameter wavelength emission.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-86073 , NAS 1.15:86073
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  • 8
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    Association of corotating magnetic sector structure with Jupiters decameter-wave radio emissions (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Chree (superposed epoch) analyses of Jupiter's decameter-wave radio emission taken from the new Thieman (1979) catalog show highly significant correlation with solar activity indicated by the geomagnetic Ap index. The correlation effects can be explained in terms of corotating interplanetary magnetic sector features. At times when the solar wind velocity is relatively low, about 300 to 350 km/s, a sector boundary can encounter the Earth and Jupiter almost simultaneously during the period immediately before opposition. After opposition this will not normally occur as the solar wind velocities necessary are too low. The correlation effects are much enhanced for the three apparitions of 1962-1964 during which a relatively stable and long-lived sector pattern was present. Chree analyses for this period indicate periodicities, approximately equal to half the solar rotation period, in the Jupiter data.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-79703
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