Evidence for resonant mode coupling in Saturn's magnetosphere

Cramm, R.; Glassmeier, K.; Stellmacher, Martin; Othmer, Carsten

doi:10.1029/98ja00629

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…In fact, its spatial scale exceeds the size of the MHD waveguide in the cusp. Thus, this model cannot be applied for the ULF cusp phenomena in the low-frequency range ω ω A , though it may describe guidance of compressional disturbances along a large-scale plasma layer, like in the magnetosphere of Saturn (Cramm et al, 1998).…”

Section: Relevance To Ulf Observations In the Cuspmentioning

confidence: 99%

Magnetohydrodynamic waveguide/resonator for Pc3 ULF pulsations at cusp latitudes

et al. 2014

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We present a possible theoretical model for the generation of travelling Alfven waves by external compressional disturbances in a two-dimensional inhomogeneous plasma. The transformation of a compressional wave mode into Alfven waves guided by the magnetic field is considered in a region with decreased Alfven velocity. This region represents, on the one hand, a waveguide for compressional oscillations, and on the other hand, a resonator with opaque boundaries for Alfven waves. The wave transformation is most effective in a resonant case, when the frequency of a compressional mode approaches the local Alfven frequency of a resonator. This model is applied to the interpretation of Pc3 observations in the cusp region. The mechanism can ensure the selective amplification of magnetosheath turbulence in the Pc3 band in the high-latitude cusp.

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Section: Relevance To Ulf Observations In the Cuspmentioning

confidence: 99%

Magnetohydrodynamic waveguide/resonator for Pc3 ULF pulsations at cusp latitudes

et al. 2014

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“…Some ultra-low frequency (ULF) pulsations are standing MHD waves in the Earth's magnetosphere, with there being indications that such eigen-oscillations may also exist at Jupiter and Mercury although none have been observed in the Saturnian magnetosphere. Work by Cramm et al, 1998 shows that the Voyager 1 spacecraft crossed an area of resonant mode coupling during its Saturn encounter. The sensitivity and high time resolution of the magnetometer will enable us in conjunction with the Cassini radio wave instrument to better resolve the wave spectrum at Saturn, for example, very close to the planet only the magnetometer has the capability of resolving down to the proton gyro-frequency.…”

Section: Nature Of the Low Frequency Wave Spectrummentioning

confidence: 99%

“…The Schmidt coefficients are chosen to minimise, in a least squares sense, the differences between the model field and the observed field. Field modelling at Saturn to date (Smith et al, 1980a;Smith et al, 1980b;Acuna et al, 1983;Smith, 1986, 1990) has revealed that the dipole is axially coincident with the rotation axis, with significant quadrupole and octupole terms. Taking the summation over n beyond the octupole (n = 3) term is unwarranted with existing data and the only significant model coefficients generated are those of g 0 1 , g 0 2 and g 0 3 , shown in Table I, in this instance for the SPV harmonic model (Davis and Smith, 1990), generated from magnetometer data from all three of the previous flyby data sets.…”

Section: Saturnmentioning

confidence: 99%

The Cassini Magnetic Field Investigation

Dougherty

Kellock

Southwood

et al. 2004

The Cassini-Huygens Mission

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289

315

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Abstract. The dual technique magnetometer system onboard the Cassini orbiter is described. This instrument consists of vector helium and fluxgate magnetometers with the capability to operate the helium device in a scalar mode. This special mode is used near the planet in order to determine with very high accuracy the interior field of the planet. The orbital mission will lead to a detailed understanding of the Saturn/Titan system including measurements of the planetary magnetosphere, and the interactions of Saturn with the solar wind, of Titan with its environments, and of the icy satellites within the magnetosphere.

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“…This conversion mechanism ensures selective amplification of Alfvén waves at certain frequencies, resulting in the resonant conversion of running fast magnetoacoustic waves into Alfvén waves in an unbounded plasma. This conversion mechanism can be applied to interpret the occurrence of quasi-monochromatic wave trains in the magnetospheres of giant planets (Cramm et al 1998) or on open field lines in the solar corona.…”

Section: Mhd Wave Coupling On Open Field Lines In the Magnetospherementioning

confidence: 99%

Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding

Nakariakov

Пилипенко

Heilig³

et al. 2016

Space Sci Rev

186

128

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Magnetohydrodynamic (MHD) oscillatory processes in different plasma systems, such as the corona of the Sun and the Earth's magnetosphere show interesting similarities and differences, which so far received little attention and remain underexploited. The successful commissioning within the past ten years of SDO, Hinode, STEREO and THEMIS spacecraft, in combination with matured analysis of data from earlier spacecraft (Wind, SOHO, ACE, Cluster, TRACE and RHESSI) makes it very timely to survey the breadth of observations giving evidence for MHD oscillatory processes in solar and space plasmas, and state-of-the-art theoretical modelling. The paper reviews several important topics, such as Alfvénic resonances and mode conversion; MHD waveguides, such as the magnetotail, coronal loops, coronal streamers; mechanisms for periodicities produced in energy releases during substorms and solar flares, possibility of Alfvénic resonators along open field lines; possible drivers of MHD waves; diagnostics of plasmas with MHD waves; interaction of MHD waves with partly-ionised boundaries (ionosphere and chromosphere). The review is mainly oriented to specialists in magnetospheric physics and solar physics, but not familiar with specifics of the adjacent research fields.

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Evidence for resonant mode coupling in Saturn's magnetosphere

Cited by 19 publications

References 26 publications

Magnetohydrodynamic waveguide/resonator for Pc3 ULF pulsations at cusp latitudes

Magnetohydrodynamic waveguide/resonator for Pc3 ULF pulsations at cusp latitudes

The Cassini Magnetic Field Investigation

Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding

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