Observations of a variable radio source associated with the planet Jupiter

Burke, B. F.; Franklin, K. L.

doi:10.1029/jz060i002p00213

Cited by 370 publications

(157 citation statements)

References 2 publications

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“…About a decade after the discovery of Jupiter's decametric radiation by Burke and Franklin [1955], when radio observations from spacecraft at frequencies too low to penetrate the terrestrial ionosphere had become possible, Earth's auroral kilometric radiation (AKR) was first observed [Benediktov et al, 1965]. Wu and Lee [1979] proposed the cyclotron maser instability (CMI) as the mechanism for the emission of AKR.…”

Section: Most Of the Powerful Jovian Decametric Noise Stormsmentioning

confidence: 99%

Microstructure of Jovian decametric S bursts

Carr¹,

Reyes²

1999

J. Geophys. Res.

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Abstract. We have developed a method for displaying the spectral structure of Jupiter's decametric radio S bursts on timescales down to a few microseconds, 2 orders of magnitude finer than has been achieved elsewhere. By employing an extremely sensitive antenna (640 dipoles, at 26 MHz) and selecting only relatively weak S bursts that possess the simplest possible spectral shape, we identify frequently occurring structural features that we associate with localized emission centers. On timescales having better than about 30/•s resolution we find that the S burst baseband oscillation (and therefore the RF oscillation) is modulated to form distinct pulses, which we refer to as subpulses. Still finer time resolution reveals that within individual subpulses the baseband (and RF) oscillation often displays segments in which the usually drifting phase term abruptly becomes essentially constant and, after remaining so for 10 to 100 /•s, abruptly resumes its random drift. It is these abruptly starting and ending segments of phase coherence that we attribute to isolated powerful centers of cyclotron maser wave amplification, which happen for brief intervals to be the only ones that are active. We believe that the more usual phase-incoherent condition (i.e., one in which the instantaneous frequency drifts randomly within the emission band) is due to the fact that the resultant radiation is the sum of two or more components from neighboring wave amplification centers emitting at slightly different frequencies, with independently varying intensities. Possible models for the production of subpulses and phase coherent intervals are discussed.

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Section: Most Of the Powerful Jovian Decametric Noise Stormsmentioning

confidence: 99%

Microstructure of Jovian decametric S bursts

Carr¹,

Reyes²

1999

J. Geophys. Res.

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“…Because of their powerful nature and ability to be observed even from ground-based observatories (dating from Burke and Franklin [1955]), decametric radiation (3 <f< 40 MHz) has been the most studied Jovian radio emission. The correlation between the orbital phase of Io and the occurrence of DAM storms [Bigg, 1964] [ 1979], Boischot et al [ 1981 ], and a thorough review of the spectral phenomenology was presented by Carr et al [1983].…”

Section: Introductionmentioning

confidence: 99%

Control of Jovian radio emission by Callisto

Menietti

Gurnett

Christopher

2001

Geophysical Research Letters

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Abstract. Galileo has been in orbit around Jupiter since December 1995 and a large database has been collected. We present the results of a survey of the plasma wave data for the frequency range 2.0 MHz to 5.6 MHz, the low frequency decametric (DAM) emissions. While the control of a portion of the radio emission by the moon Io is well known, and Ganymede control has been more recently indicated, we report that a small but significant portion of DAM emission is seen to be correlated with the orbital phase of Callisto. While the occurrence rate of emission controlled by Ganymede and Callisto is considerably less than for Io, the power levels can be nearly the same. We estimate the power of the Callisto-dependent emission to be ~70% of the Io-dependent radio emission and about the same as the Ganymede-dependent radio emission. This result indicates an Alfvtn current system associated with Callisto, and thus a significant interaction of the magnetosphere of Callisto with that of Jupiter as is believed to exist for both Io and Ganymede.

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“…Ground based observations date from Burke and Franklin [1955], revealing the power of the Jovian transmitter. The exciting discovery of the correlation between the orbital phase of Io and the occurrence of DAM storms [Bigg, 1964] marked the beginning of an increasingly intense study of the source location and generation mechanism for DAM emission.…”

Section: Introductionmentioning

confidence: 99%

Control of Jovian radio emission by Ganymede

Menietti

Gurnett

Kŭrth

et al. 1998

Geophysical Research Letters

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Abstract. Galileo has been in orbit around Jupiter since December 1995. We present the results of a survey of the data for the frequency range 3.2 MHz to 5.6 MHz, the low-frequency decametric (DAM) emissions. While the control of a portion of the radio emission by the moon Io is well-known, we report that a small but significant portion of low-frequency DAM emission is seen to be correlated with the orbital phase of Ganymede. This result is in agreement with other recent results indicating a significant interaction of the magnetosphere of Ganymede with that of Jupiter.

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Observations of a variable radio source associated with the planet Jupiter

Cited by 370 publications

References 2 publications

Microstructure of Jovian decametric S bursts

Microstructure of Jovian decametric S bursts

Control of Jovian radio emission by Callisto

Control of Jovian radio emission by Ganymede

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