Properties of Saturn kilometric radiation measured within its source region

Lamy, Laurent; Schippers, P.; Zarka, Philippe; Cecconi, Baptiste; Arridge, C. S.; Dougherty, M. K.; Louarn, P.; André, Nicolas; Kurth, W. S.; Mutel, R. L.; Gurnett, D. A.; Coates, A. J.

doi:10.1029/2010gl043415

Cited by 86 publications

(137 citation statements)

References 17 publications

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“…We will interpret these parameters in Section 3.2. The standard values of these parameters are derived from estimations of solar bursts (typically 0.1c to 0.5c for the drift velocity and 0.002c to 0.05c for the thermal velocity; Dulk 1985) and the studies on auroral kilometric radiation on the Earth, Jovian millisecond bursts, and Saturnian kilometric radiation (∼1-10 keV for the energetic electrons and ∼100 eV for the thermal electrons; Zarka 1998; Hess et al 2007aHess et al , 2007bZarka 2007;Lamy et al 2010). The values of the electron velocities in the relativistic case (see Section 5) refer to the work of Louarn et al (1986), and references therein.…”

Section: Initial Configurations Of the Simulationsmentioning

confidence: 99%

Electron-Beam-Induced Radio Emission From Ultracool Dwarfs

Doyle

Kuznetsov

et al. 2012

ApJ

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We present the numerical simulations for an electron-beam-driven and loss-cone-driven electron-cyclotron maser (ECM) with different plasma parameters and different magnetic field strengths for a relatively small region and short timescale in an attempt to interpret the recent discovered intense radio emission from ultracool dwarfs. We find that a large amount of electromagnetic (EM) field energy can be effectively released from the beam-driven ECM, which rapidly heats the surrounding plasma. A rapidly developed high-energy tail of electrons in velocity space (resulting from the heating process of the ECM) may produce the radio continuum depending on the initial strength of the external magnetic field and the electron beam current. Both significant linear polarization and circular polarization of EM waves can be obtained from the simulations. The spectral energy distributions of the simulated radio waves show that harmonics may appear from 10 to 70ν pe (ν pe is the electron plasma frequency) in the non-relativistic case and from 10 to 600ν pe in the relativistic case, which makes it difficult to find the fundamental cyclotron frequency in the observed radio frequencies. A wide frequency band should therefore be covered by future radio observations.

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Section: Initial Configurations Of the Simulationsmentioning

confidence: 99%

Electron-Beam-Induced Radio Emission From Ultracool Dwarfs

Doyle

Kuznetsov

et al. 2012

ApJ

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“…The estimated locations were found to match that of UV and IR auroras. On the other hand, Lamy et al [2010Lamy et al [ ,2011 took benefit of spacecraft crossing (2008 October 17) of some SKR southern sources, for measuring CMI emission angle and polarisation near the source. They found a mixture of X and O-mode with different spectral coverages, a large beaming angle and a strong elliptical polarisation of the SKR near 10 kHz.…”

Section: Some Already Published Dfandpol Results On Skrmentioning

confidence: 99%

Direction Finding and Polarization Measurements of SKR (invited)

Lecacheux¹

2011

Planetary Radio Emissions Vii

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The Saturnian Kilometric Radio emission (SKR), discovered and briefly observed by Voyager spacecraft in 1980-81, is now studied in depth by Cassini, which is still in orbit around Saturn, since mid 2004.Aboard Cassini, the main radio astronomy system (the HFR part of the RPWS instrument) is based on digital, real time, spectral correlation of several pass band filters, analyzing multiple wire antennas. This system allows, in principle, the full second order statistics of the analyzed signal to be retrieved, thus providing, compared to a simple antenna system, some extra information on the received radio waves: mainly about the spatial brightness distribution (leading to direction finding (DF) for a point source model) and the intrinsic polarisation of the measured radio source.While there is no doubt that SKR, like terrestrial and Jovian radio emissions, is powered via a cyclotron maser (CMI) originating from accelerated auroral particles, the exact scenario remains, at the moment, far from being understood: the complex modulation of the SKR at the planetary spin rate is perplexing; the fact that the apparent SKR polarization changes with observer's latitude and contains a substantial amount of linear polarisation when observed from mid to high latitudes, is quite unexpected and likely the indication of a complex source structure and/or unusual propagation regime in Saturn's high latitude regions.

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“…Rather, we discuss some aspects of Jovian radio studies that are of particular relevance to Juno, its orbit, and the capabilities of the Waves instrument on the spacecraft. Given that a primary objective of Juno is to carry out the first exploration of Jupiter's polar magnetosphere and that Juno's orbit will almost certainly carry it through source regions of Jupiter's auroral radio emissions, it is anticipated that observations similar to those made by Cassini in the Saturn kilometric radiation (SKR) source region Lamy et al 2010 shown in Fig. 5 will be obtained.…”

Section: Auroral Radio Emissionsmentioning

confidence: 99%

The Juno Waves Investigation

et al. 2017

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Jupiter is the source of the strongest planetary radio emissions in the solar system. Variations in these emissions are symptomatic of the dynamics of Jupiter's magnetosphere and some have been directly associated with Jupiter's auroras. The strongest radio emissions are associated with Io's interaction with Jupiter's magnetic field. In addition, plasma waves are thought to play important roles in the acceleration of energetic particles in the magnetosphere, some of which impact Jupiter's upper atmosphere generating the auroras. Since the exploration of Jupiter's polar magnetosphere is a major objective of the Juno mission, it is appropriate that a radio and plasma wave investigation is included in Juno's payload. This paper describes the Waves instrument and the science it is to pursue as part of the Juno mission.

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Properties of Saturn kilometric radiation measured within its source region

Cited by 86 publications

References 17 publications

Electron-Beam-Induced Radio Emission From Ultracool Dwarfs

Electron-Beam-Induced Radio Emission From Ultracool Dwarfs

Direction Finding and Polarization Measurements of SKR (invited)

The Juno Waves Investigation

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