The influence of Titan on Saturn kilometric radiation

Menietti, J. D.; Ye, Shengyi; Piker, Chris; Cecconi, Baptiste

doi:10.5194/angeo-28-395-2010

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…Voyager measurements suggested that Dione (period = 2.7 days) might control certain radio emissions [ Desch and Kaiser , ; Kurth et al ., ]. Subsequent examination of RPWS data over a longer time span showed that Dione did not influence Saturn's radio emissions nor did any of the planet's other satellites, with the notable exception of Titan [ Menietti et al ., , ]. SKR appears to have a higher occurrence probability when Titan is located in the midnight sector than that when it is in the midmorning sector [ Menietti et al ., ].…”

Section: Cassini‐era Observations Of Saturn's Periodicitymentioning

confidence: 99%

“…Subsequent examination of RPWS data over a longer time span showed that Dione did not influence Saturn's radio emissions nor did any of the planet's other satellites, with the notable exception of Titan [ Menietti et al ., , ]. SKR appears to have a higher occurrence probability when Titan is located in the midnight sector than that when it is in the midmorning sector [ Menietti et al ., ]. Insofar as “substorms” (or tail reconnection events) may be identified in Saturn's magnetosphere, they seem to occur at times when Titan lies in the midnight sector [ Russell et al ., ].…”

Section: Cassini‐era Observations Of Saturn's Periodicitymentioning

confidence: 99%

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Periodicities in Saturn's magnetosphere

Carbary

Mitchell

2013

Reviews of Geophysics

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Although the exact rotation period of Saturn is unknown, Saturn's magnetosphere displays an abundance of periodicities near ~10.7 h. Such modulations appear in charged particles, magnetic fields, energetic neutral atoms, radio emissions, motions of the plasma sheet and magnetopause, and even in Saturn's rings themselves. Known to an accuracy of four significant figures, these periodicities do not remain constant but vary by ~1% over time scales of a year or longer. Magnetospheric periodicities also display slightly different periods in the northern and southern hemispheres: ~10.6 h and ~10.8 h, respectively. The magnetic and spin axes of Saturn are aligned to within ~1°, so that Saturn's magnetospheric periodicities cannot be explained as “wobble” caused by a geometric tilt, unlike those of the Earth and Jupiter. Furthermore, the variations in periodicity argue against a cause related to changes interior to an object as large as Saturn. Several models have been proposed for the periodicities, including rotating planetary vortices, periodic plasma releases, and a flapping magnetodisk, but none can satisfactorily explain all of Saturn's periodicities. This review discusses the observations of these periodicities from their initial discovery during the Pioneer flyby to their long‐term surveillance by Cassini and examines the various struggles to explain and model them. Understanding Saturn's periodicity may elucidate periodic phenomena in other magnetospheric environments.

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Section: Cassini‐era Observations Of Saturn's Periodicitymentioning

confidence: 99%

Section: Cassini‐era Observations Of Saturn's Periodicitymentioning

confidence: 99%

Periodicities in Saturn's magnetosphere

Carbary

Mitchell

2013

Reviews of Geophysics

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“…Galileo and Juno have provided observations of bKOM, HOM, and DAM from 10 kHz to 40 MHz (Gurnett et al 1996). The Cassini spacecraft has provided numerous observations of SKR from 2004 to 2017 (Menietti et al 2010;Ye et al 2011Ye et al , 2016Ye et al , 2018Wu et al 2021). So far, observations of UKR and NKR still come mainly from Voyager 2 (Warwick et al 1986(Warwick et al , 1989.…”

Section: Introductionmentioning

confidence: 99%

Annual and Seasonal Occurrence Pattern of Auroral Kilometric Radiation Associated with the Interplanetary Magnetic Field*

Li,

Zhang,

Xiao

et al. 2024

ApJL

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Auroral kilometric radiation (AKR) is a widely existing strong radio emission from the Earth’s magnetosphere and is generated by suprathermal (1–10 keV) electrons in the polar cavity. Previous works have demonstrated that AKR can contribute to the coupling of the magnetosphere–ionosphere–atmosphere, but its relation to the interplanetary magnetic field (IMF) has not been studied so far. Here, we examine the data of Van Allen Probes and identify a total of 5000 AKR events from 2012 October to 2019 July. Most AKR events (4282) correspond to the dominant parallel component B ∥ ( = ( B x ) 2 + ( B y ) 2 ) of IMF. There are the most (1391) events in 2018 (the solar minimum year) and the least (258) events in 2014 (the solar maximum year), corresponding to more (less) occurrences for the longer duration (> 30 minutes) of southward IMF (B z < 0) in 2018 (2014). In the Earth’s Northern Hemisphere, there are the most (865) events in the autumn (August–October), corresponding to dominant B x < 0. In the Earth’s Southern Hemisphere, there are the most (830) events in the autumn (February–April), corresponding to dominant B x > 0. The probable reason for the above results is that the longer duration of B z < 0 can yield the longer magnetic reconnection, and the dominant B x < 0 (B x > 0) is favorable for the single-lobe magnetic reconnection in the northern (southern) hemisphere, allowing more suprathermal electrons into the polar source cavity and generating more AKRs. These current results suggest that IMF is very important for the occurrence of AKR and can be widely applied to similar auroral radio emissions in other magnetized planets of the solar system.

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A new approach to Saturn's periodicities

Carbary

2015

JGR Space Physics

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Saturn's magnetospheric periodicities are commonly thought to have a dual nature, one period originating from the southern hemisphere and a slightly different period from the northern. Both periods vary a few percent over time intervals of years and apparently merged a few months after Saturn equinox. These periodicities have not been explained. The dual‐period waveform is generally represented as the superposition of two sinusoids with nearly equal periods. However, dual‐period waves can also result from an amplitude modulation of a carrier periodicity, from frequency modulation of the carrier, from random phase jumps in the carrier, and from small, random changes in the period itself. While such simple phenomena are well known in the radio community, they can serve as possible explanations for how a single planetary period can appear as the dual (or multiple) periods observed in Saturn's magnetosphere. Candidates for modulation and randomization include the solar wind pressure and speed, the orbital periods of moons of Saturn, or even the trajectory of the Cassini orbiter itself.

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The influence of Titan on Saturn kilometric radiation

Cited by 5 publications

References 38 publications

Periodicities in Saturn's magnetosphere

Periodicities in Saturn's magnetosphere

Annual and Seasonal Occurrence Pattern of Auroral Kilometric Radiation Associated with the Interplanetary Magnetic Field*

A new approach to Saturn's periodicities

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