Collisional diffusion of a partially-ionized plasma in a magnetic field

Zhilinskii, A.P.; Tsendin, L.D.

doi:10.3367/ufnr.0131.198007b.0343

Cited by 15 publications

(6 citation statements)

References 5 publications

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“…When the magnetic field is large enough for flow anisotropies to be significant, at least for electrons, and if the only gradients are perpendicular to the magnetic field, one may expect to have an identical situation in the plane perpendicular to the magnetic field direction as that obtained in all directions in the absence of magnetic field (Monroe 1973;Zhilinskii and Tsendin 1980;Golant et al 1980;Vidal et al 1999), in which the free diffusion coefficients and mobilities should be replaced with coefficients and mobilities under the action of a magnetic field. When a magnetic field exists the equivalent equation to (6.11) is now D a?…”

Section: Ambipolar Diffusion With a Magnetic Fieldmentioning

confidence: 99%

Kinetics and Spectroscopy of Low Temperature Plasmas

Loureiro

Amorim

2016

Graduate Texts in Physics

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Graduate Texts in Physics publishes core learning/teaching material for graduateand advanced-level undergraduate courses on topics of current and emerging fields within physics, both pure and applied. These textbooks serve students at the MS-or PhD-level and their instructors as comprehensive sources of principles, definitions, derivations, experiments and applications (as relevant) for their mastery and teaching, respectively. International in scope and relevance, the textbooks correspond to course syllabi sufficiently to serve as required reading. Their didactic style, comprehensiveness and coverage of fundamental material also make them suitable as introductions or references for scientists entering, or requiring timely knowledge of, a research field.More information about this series at

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Section: Ambipolar Diffusion With a Magnetic Fieldmentioning

confidence: 99%

Kinetics and Spectroscopy of Low Temperature Plasmas

Loureiro

Amorim

2016

Graduate Texts in Physics

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“…When considering conditions for the formation of a perturbed ionospheric region in the part of evolution of different-scale plasma-density and plasma-temperature fluctuations, it is assumed, as a rule, that they propagate along the geomagnetic field due to thermodiffusion mechanisms of spreading from the region of intense generation of perturbations near the PW reflection point having small vertical sizes compared with the heat-conductance length (see, e.g., [26][27][28][29][30]). In this case, the velocity of propagation of perturbations along the geomagnetic field in the ambipolar approximation, which is often used, must be determined by the collisional diffusion of ions as the most mobile particles in this direction and have a characteristic value close to their thermal velocity, i.e., V ≈ V T i ≈ 10 5 cm/s for typical conditions of the experiments we performed in the F 2 layer of the midlatitude ionosphere.…”

Section: Discussion Of Measurement Results and Final Commentsmentioning

confidence: 99%

On the effects observed during modification of the earth’s upper ionosphere by high-power short radio pulses

Frolov

Комраков

Nedzvetsky

et al. 2006

Radiophys Quantum Electron

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We report on the results of studies of the evolution of artificial ionospheric turbulence (AIT) excited by short pulses of high-power short-wave O-mode radio emission in the ionospheric F region. On the basis of the obtained experimental data, it is assumed that the streams of thermal and suprathermal electrons generated in the regions of resonant interaction between a high-power radio wave and the plasma and propagating along the geomagnetic field stimulate the development of plasma perturbations far away from the primary-turbulence regions. Specific features of the measurement procedure are considered, an empirical model of the observed phenomena is developed, and possible problems in the further studies are outlined.

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“…The currents are therefore proportional to the ion implantation flux into the surface, i.e., to the density times the ion thermal speed, as verified by our IHM runs. A related example of “thermal” field‐aligned plasma currents may be the “short‐circuit” effect first discussed by Simon [] in magnetically confined laboratory plasmas, in which cross‐field thermal ion diffusion, e.g., to the axial walls of a conductive containment vessel [ Zhilinskii and Tsendin , ], can induce field‐aligned electron eddy currents which short across field lines at the end walls [ Drentje et al ., ]. The competition of these currents with electron ambipolar diffusion has been the focus of recent theoretical discussion [ Fruchtman , ] and simulation studies [ Lafleur and Boswell , ], and thermally driven electron shorting currents turn out to be a significant design consideration for electron cyclotron ion sources [ Schachter et al ., ].…”

Section: Current System Wave Modes and Physical Requirementsmentioning

confidence: 99%

Surface current balance and thermoelectric whistler wings at airless astrophysical bodies: Cassini at Rhea

et al. 2014

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Sharp magnetic perturbations found by the Cassini spacecraft at the edge of the Rhea flux tube are consistent with field-aligned flux tube currents. The current system results from the difference of ion and electron gyroradii and the requirement to balance currents on the sharp Rhea surface. Differential-type hybrid codes that solve for ion velocity and magnetic field have an intrinsic difficulty modeling the plasma absorber's sharp surface. We overcome this problem by instead using integral equations to solve for ion and electron currents and obtain agreement with the magnetic perturbations at Rhea's flux tube edge. An analysis of the plasma dispersion relations and Cassini data reveals that field-guided whistler waves initiated by (1) the electron velocity anisotropy in the flux tube and (2) interaction with surface sheath electrostatic waves on topographic scales may facilitate propagation of the current system to large distances from Rhea. Current systems like those at Rhea should occur generally, for plasma absorbers of any size such as spacecraft or planetary bodies, in a wide range of space plasma environments. Motion through the plasma is not essential since the current system is thermodynamic in origin, excited by heat flow into the object. The requirements are a difference of ion and electron gyroradii and a sharp surface, i.e., without a significant thick atmosphere.Key PointsSurface current balance condition yields a current system at astronomical bodiesCurrent system possible for sharp (airless) objects of any sizeCurrent system is thermoelectric and motion through the plasma nonessential

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Collisional diffusion of a partially-ionized plasma in a magnetic field

Cited by 15 publications

References 5 publications

Kinetics and Spectroscopy of Low Temperature Plasmas

Kinetics and Spectroscopy of Low Temperature Plasmas

On the effects observed during modification of the earth’s upper ionosphere by high-power short radio pulses

Surface current balance and thermoelectric whistler wings at airless astrophysical bodies: Cassini at Rhea

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