Measurement of the transpolar potential in laboratory magnetosphere

Шайхисламов, И. Ф.; Antonov, V. A.; Boyarintsev, E. L.; Posukh, V. G.; Мелехов, А. В.; Zakharov, Yu. P.; Ponomarenko, A. G.

doi:10.1134/s001095251206007x

Cited by 8 publications

(22 citation statements)

References 29 publications

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“…There is no frozen-in magnetic field as analog of IMF. However, small guiding field Diagnostics consisted of three-component magnetic probes, Faraday cups and Langmuir probes described in (Shaikhislamov et al 2012). Spatial resolution was better than 0.5 cm.…”

Section: Experimental Set Upmentioning

confidence: 99%

Experimental study of a mini-magnetosphere

Шайхисламов¹,

Zakharov²,

Posukh³

et al. 2014

Plasma Phys. Control. Fusion

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Magnetosphere at ion kinetic scales, or mini-magnetosphere, possesses unusual features as predicted by numerical simulations. However, there are practically no data on the subject from space observations and the data which are available are far too incomplete. In the present work we describe results of laboratory experiment on interaction of plasma flow with magnetic dipole with parameters such that ion inertial length is smaller than a size of observed magnetosphere. A detailed structure of non-coplanar or out-of-plane component of magnetic field has been obtained in meridian plane. Independence of this component on dipole moment reversal, as was reported in previous work, has been verified. In the tail distinct lobes and central current sheet have been observed. It was found that lobe regions adjacent to boundary layer are dominated by non-coplanar component of magnetic field. Tail-ward oriented electric current in plasma associated with that component appears to be equal to ion current in the upstream part of magnetosphere and in the tail current sheet implying that electrons are stationary in those regions while ions flow by. Obtained data strongly support the proposed model of mini-magnetosphere based on two-fluid effects as described by the Hall term.

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Section: Experimental Set Upmentioning

confidence: 99%

Experimental study of a mini-magnetosphere

Шайхисламов¹,

Zakharov²,

Posukh³

et al. 2014

Plasma Phys. Control. Fusion

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“…As described in our previous publications [4,5,[23][24][25], the laboratory experiments on the laser produced plasma flow around the magnetic dipole demonstrated that an intense FAC system is generated on the poles in addition to a clearly defined frontal part of the mag netosphere. The detailed measurements of the FAC total value and local density and magnetic distur bances at the poles indicated that these currents are similar to the Region 1 currents at the Earth.…”

Section: Field Aligned Currents and Magnetospheric Generator In Expermentioning

confidence: 69%

“…It was found that the transpolar potential is proportional to the ion energy in the upstream flow. It was experimen tally confirmed that the positive potential on the dawn (western) side and the negative potential on the dusk (eastern) side exist in the plasma at the boundary layer inner boundary, and the value of a difference between these potentials in the plasma corresponds to the tran spolar potential observed on the poles and to the induction electric field value in the boundary layer ( ) [25]. The present work illustrates the laboratory study of the mechanism by which FACs are generated and pre sents new experimental data.…”

Section: Field Aligned Currents and Magnetospheric Generator In Expermentioning

confidence: 82%

Field-aligned currents and magnetospheric generator in experiments on a laser-produced plasma flowing around a magnetic dipole

et al. 2014

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A laboratory experiment on modeling the magnetospheric generator of the field aligned currents and the Earth's transpolar potential in the absence of IMF is illustrated. The measurements of the total field aligned current in the generator shorted mode and the transpolar potential in the circuit disconnection mode made it possible to determine the generator internal resistance. A model that explains the saturation current and internal resistance by the feedback between the field aligned current and plasma flank motions has been proposed. This feedback is described through the effective resistance, which is proportional to the flow rate and the ratio of the boundary layer to the dimension of the magnetosphere. For the experimental conditions, the calculated generator resistance was in good agreement with the measured value. The estimates for the Earth's magnetosphere indicate that the MHD generator internal resistance in the boundary layer is usually much lower than the reverse integral conductivity of the ionosphere.

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“…These laser-ablated plasmas can be mildly collisional or collisionless, replicating astrophysical conditions 19,20 . By adding dipole field sources against the plasma flow, previous experiments of mini magnetospheres studied possible applications for spacecrafts [21][22][23] , the formation of lunar swirls 11 , and the conditions for the formation of magnetosphere features [24][25][26][27] . Although these experiments achieved important breakthroughs in the study of ion-scale magnetospheric physics, they were limited to i) 1D measurements of the magnetic field and plasma density profiles and ii) fixed properties of the obstacle and plasma flow.…”

Section: Introductionmentioning

confidence: 99%

Laser-Driven, Ion-Scale Magnetospheres in Laboratory Plasmas. II. Particle-in-cell Simulations

Cruz,

Schaeffer,

Cruz

et al. 2022

Preprint

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Ion-scale magnetospheres have been observed around comets, weakly-magnetized asteroids, and localized regions on the Moon, and provide a unique environment to study kinetic-scale plasma physics, in particular in the collisionless regime. In this work, we present the results of particle-in-cell simulations that replicate recent experiments on the Large Plasma Device at the University of California, Los Angeles. Using highrepetition rate lasers, ion-scale magnetospheres were created to drive a plasma flow into a dipolar magnetic field embedded in a uniform background magnetic field. The simulations are employed to evolve idealized 2D configurations of the experiments, study highly-resolved, volumetric datasets and determine the magnetospheric structure, magnetopause location and kinetic-scale structures of the plasma current distribution. We show the formation of a magnetic cavity and a magnetic compression in the magnetospheric region, and two main current structures in the dayside of the magnetic obstacle: the diamagnetic current, supported by the driver plasma flow, and the current associated to the magnetopause, supported by both the background and driver plasmas with some time-dependence. From multiple parameter scans, we show a reflection of the magnetic compression, bounded by the length of the driver plasma, and a higher separation of the main current structures for lower dipolar magnetic moments.

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Measurement of the transpolar potential in laboratory magnetosphere

Cited by 8 publications

References 29 publications

Experimental study of a mini-magnetosphere

Experimental study of a mini-magnetosphere

Field-aligned currents and magnetospheric generator in experiments on a laser-produced plasma flowing around a magnetic dipole

Laser-Driven, Ion-Scale Magnetospheres in Laboratory Plasmas. II. Particle-in-cell Simulations

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