Transport of Mass, Momentum and Energy in Planetary Magnetodisc Regions

Achilleos, N.; André, Nicolas; Blanco‐Cano, X.; Brandt, P. C.; Delamere, P. A.; Winglee, R. M.

doi:10.1007/978-1-4939-3395-2_7

Cited by 6 publications

(8 citation statements)

References 220 publications

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“…Jupiter's immense magnetosphere is due to the combination of a strong planetary magnetic field, rapid rotation and an internal plasma source (Achilleos et al, 2015;Kivelson, 2014). Io supplies neutral gas to the inner magnetosphere at a rate of roughly 1 tonne/second (Schneider & Bagenal, 2007), and about half of this gas is ionized forming the Io plasma torus (Bagenal & Delamere, 2011).…”

Section: Introductionmentioning

confidence: 99%

Radial Transport and Plasma Heating in Jupiter's Magnetodisc

Delamere

Kaminker

et al. 2018

JGR Space Physics

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The ion temperature of the magnetosphere of Jupiter derived from Galileo PLS data was observed to increase by about an order of magnitude from 10 to 40 Jupiter radii. This suggests the presence of heating sources that counteract the adiabatic cooling effect of expanding plasma. There have been different attempts of explaining this phenomena, including a magnetohydrodynamic (MHD) turbulent heating model which is based on flux tube diffusion (Saur, Astrophys. J. Lett., 602, L137, 2004). We explore an alternate turbulent heating model based on advection, similar to models commonly used in solar wind heating. Based on spectral analysis of Galileo magnetometer (MAG) data, we find that observed MHD turbulence could potentially provide the required heating to explain some of the increase in plasma temperature. This indicates that advection is a more appropriate way to describe radial transport of plasma in the Jovian magnetosphere beyond 10 Jupiter radii.

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Section: Introductionmentioning

confidence: 99%

Radial Transport and Plasma Heating in Jupiter's Magnetodisc

Delamere

Kaminker

et al. 2018

JGR Space Physics

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“…The spectrogram shows evidence of dispersion where the more energetic ions seem to have drifted out of the injected flux tube (Paranicas et al 2016;Thomsen et al 2014b). This dispersion has been used as a signature that the injection is "old" (Hill et al 2005;Mauk et al 2005;Achilleos 2015;Mitchell et al 2015).…”

Section: Event 2 (2007 May 27)mentioning

confidence: 98%

“…The coupling of this plasma production with the rapid rotation (an effective outward "gravity" or centrifugal force) produces an inward gradient in the flux tube content that is unstable to interchange, much like the Rayleigh-Taylor instability in fluids (e.g., Sittler et al 2008;Bagenal & Delamere 2011;Liu et al 2010;Liu & Hill 2012;Thomsen et al 2013;Ma et al 2016;Azari et al 2019;Stauffer et al 2019). As a result, flux tubes with cold dense plasma tend to migrate outward, while flux tubes carrying hot tenuous plasma migrate inward from the outer magnetosphere, forming the socalled interchange injections (Chen & Hill 2008;Kennelly et al 2013;Thomsen et al 2016;Azari et al 2018;Achilleos 2015;Hill 1976). Simulations show cold fingers moving outward and warmer, emptier flux tubes moving inward (Liu et al 2010).…”

Section: Introductionmentioning

confidence: 99%

The Roles of Flux Tube Entropy and Effective Gravity in the Inward Plasma Transport at Saturn

Wing

Thomsen

Mitchell

et al. 2022

ApJ

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The inward plasma transport at the Saturnian magnetosphere is examined using the flux tube interchange stability formalism developed by Southwood & Kivelson. Seven events are selected. Three cases are considered: (1) the injected flux tube and ambient plasmas are nonisotropic, (2) the injected flux tube and ambient plasmas are isotropic, and (3) the injected flux tube plasma is isotropic, but the ambient plasma is nonisotropic. Case 1 may be relevant for fresh injections, while case 3 may be relevant for old injections. For cases 1 and 2, all but one event have negative stability conditions, suggesting that the flux tube should be moving inward. For case 3, the injections located at L > 11 have negative stability conditions, while four out of five of the injections at L < 9 have positive stability conditions. The positive stability condition for small L suggests that the injection may be near its equilibrium position and possibly oscillating thereabouts—hence the outward transport if the flux tube overshot the equilibrium position. The flux tube entropy plays an important role in braking the plasma inward transport. When the stability condition is positive, it is because the entropy term, which is positive, counters and dominates the effective gravity term, which is negative for all the events. The ambient plasma and drift-out from adjacent injections can affect the stability and the inward motion of the injected flux tube. The results have implications for inward plasma transport in the Jovian magnetosphere, as well as other fast-rotating planetary magnetospheres.

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“…The torus contains on the order of ~ 10 6 tonnes of plasma and extends between ~ 5-10 R J with scale height on the order of ~ 1 R J . Plasma is radially transported outward from the torus through processes such as flux tube interchange and magnetic field ballooning/reconfiguration (e.g., Thomas et al [2004]; Kivelson and Southwood [2005]; review by Achilleos et al [2015]; and references therein).…”

Section: Io Torusmentioning

confidence: 99%

The Nature of Jupiter's Magnetodisk Current System

Achilleos

2018

Electric Currents in Geospace and Beyond

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This chapter gives an overview of the properties of the magnetodisk current in the Jovian system. We describe the global morphology of the current sheet embedded in the plasmadisk / magnetodisk and the observational signatures of currents in this structure. We then consider the role of disk currents in force balance and plasmasheet structure in an axisymmetric, rotating system. We also describe the dependence of current density on spatial location, global size of the magnetosphere, and asymmetries plausibly associated with the influence of solar wind. We conclude with a simplified description of the microscopic nature of the particle motions in the magnetospheric plasma, whose collective action produces the currents themselves.

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Transport of Mass, Momentum and Energy in Planetary Magnetodisc Regions

Cited by 6 publications

References 220 publications

Radial Transport and Plasma Heating in Jupiter's Magnetodisc

Radial Transport and Plasma Heating in Jupiter's Magnetodisc

The Roles of Flux Tube Entropy and Effective Gravity in the Inward Plasma Transport at Saturn

The Nature of Jupiter's Magnetodisk Current System

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