Plasma Motion Across Magnetic Fields

Schmidt, G.

doi:10.1063/1.1706163

Cited by 154 publications

(85 citation statements)

References 7 publications

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“…Neubert et al, 1992). The computer experiments performed emphasized the self-polarization of plasma elements and their propagation across the transverse magnetic field, as described by Schmidt's model (Schmidt, 1960). Later on, Hurtig et al (2003) and Gunell et al (2009) have studied the motion of three-dimensional plasmoids across curved magnetic fields using electrostatic particle-in-cell simulations.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…The self-consistent electric field established inside the main bulk of the plasma cloud in the early stages of the simulation is the result of plasma polarization in the perpendicular plane to the magnetic field, as described by Schmidt (1960). Indeed, since the electrons and ions are gyrating in opposite directions, two space charge layers of different polarities are formed at the lateral edges of the plasma element along the perpendicular direction to both the plasma injection velocity, !…”

Section: Case A: Open Magnetic Barriermentioning

confidence: 99%

“…These charge layers sustain a polarization electric field, ! E p , inside the quasineutral bulk of the plasma cloud/jet (Schmidt, 1960):…”

Section: Case A: Open Magnetic Barriermentioning

confidence: 99%

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Transport and entry of plasma clouds/jets across transverse magnetic discontinuities: Three‐dimensional electromagnetic particle‐in‐cell simulations

Voitcu

Echim

2016

JGR Space Physics

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In this paper we use three‐dimensional electromagnetic particle‐in‐cell simulations to investigate the interaction of a small Larmor radius plasma cloud/jet with a transverse nonuniform magnetic field typical to a tangential discontinuity in a parallel geometry. The simulation setup corresponds to an idealized, yet relevant, magnetospheric configuration likely to be observed at the magnetopause during northward orientation of the interplanetary magnetic field. The numerical simulations are adapted to study the kinetic effects and their role on the transport and entry of localized plasma jets similar to those identified inside the Earth's magnetosheath propagating toward the magnetopause. The simulations reveal the formation of a perpendicular polarization electric field inside the main bulk of the plasma cloud that enables its forward transport and entry across the transverse magnetic field. The jet is able to penetrate the transition region when the height of the magnetic barrier does not exceed a certain critical threshold. Otherwise, the forward transport along the injection direction is stopped before full penetration of the magnetopause. Moreover, the jet is pushed back and simultaneously deflected in the perpendicular plane to the magnetic field. Our simulations evidence physical processes advocated previously by the theoretical model of impulsive penetration and revealed in laboratory experiments.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Case A: Open Magnetic Barriermentioning

confidence: 99%

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Transport and entry of plasma clouds/jets across transverse magnetic discontinuities: Three‐dimensional electromagnetic particle‐in‐cell simulations

Voitcu

Echim

2016

JGR Space Physics

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“…The equations of motion for each species are (8) where v / = (u "" u ,,,, 0) is the velocity vector, and j = (e, i) is the species index which can denote either electrons or ions. In Eqs.…”

Section: Basic Equationsmentioning

confidence: 99%

“…a 1 in the present study so that space charge polarization is induced on the edges of a bounded plasma column as it passes through a magnetic field. 8 The polarized space charge layers create a sell-consistent electric field which makes it possible for the plasma to propagate across the field by means of an EXB plasma drift (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Theory of plasma injection into a magnetic field

Peter¹

1982

The Physics of Fluids

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Analytic and self-consistent solutions for the propagation of a low-beta, large-gyroradius plasma across a transverse magnetic field are derived. It is shown that if "';1n? »(M /m) 112 , the beam can propagate into the field by means of an E>e B plasma drift. The cross-field velocity of the plasma in this case is found to be very nearly equal to the beam injection velocity u 0 • The theory is discussed with reference to recent proof-ofprinciple experiments on cross-field propagation.

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Penetration of magnetosheath plasma into dayside magnetosphere: 1. Density, velocity, and rotation

et al. 2016

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In this study, we examine a large number of plasma structures (filaments), observed with the Cluster spacecraft during 2 years (2007–2008) in the dayside magnetosphere but consisting of magnetosheath plasma. To reduce the effects observed in the cusp regions and on magnetosphere flanks, we consider these events predominantly inside the narrow cone ≤30° about the subsolar point. Two important features of these filaments are (i) their stable antisunward (earthward) motion inside the magnetosphere, whereas the ambient magnetospheric plasma moves usually in the opposite direction (sunward), and (ii) between these filaments and the magnetopause, there is a region of magnetospheric plasma, which separates these filaments from the magnetosheath. The stable earthward motion of these filaments and the presence of a region of magnetospheric plasma between these filaments and the magnetopause show the possible disconnection of these filaments from the magnetosheath, as suggested earlier by many researchers. The results also show that these events cannot be a result of back‐and‐forth motions of magnetopause position or surface waves propagating on the magnetopause. Another important feature of these filaments is their rotation about the filament axis, which might be a result of their passage through the velocity shear on magnetopause boundary. After crossing the velocity shear, the filaments get a rotational velocity, which has opposite directions in the noon‐dusk and noon‐dawn sectors. This rotation velocity may be an important factor, supporting the stability of these filaments and providing their motion into the magnetosphere.

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Plasma Motion Across Magnetic Fields

Cited by 154 publications

References 7 publications

Transport and entry of plasma clouds/jets across transverse magnetic discontinuities: Three‐dimensional electromagnetic particle‐in‐cell simulations

Transport and entry of plasma clouds/jets across transverse magnetic discontinuities: Three‐dimensional electromagnetic particle‐in‐cell simulations

Theory of plasma injection into a magnetic field

Penetration of magnetosheath plasma into dayside magnetosphere: 1. Density, velocity, and rotation

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