Physics of Interplanetary Plasma and Laboratory Experiments

Podgornyi, I. M.; Sagdeev, R. Z.

doi:10.1070/pu1970v012n04abeh003754

Cited by 64 publications

(29 citation statements)

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“…Complete and simultaneous scaling of electromagnetic and flow dynamical phenomena from a cosmical situation to the laboratory is theoretically impossible. However, following the principle of limited scaling [Podgorny and Sagdeev, 1970] a situation can be reached, which at least in some details, represents the real situation. Based upon this principle, the scaling of the UCR T-1 space simulation facility is discussed by Baum and Bratenahl [1982].…”

Section: Paper Number 89ja00147mentioning

confidence: 99%

Laboratory simulation of cometary neutral gas ionization

Chang

Rahman²,

White

1989

J. Geophys. Res.

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The laboratory simulation of the interaction of the solar wind with a comet is used to study the cometary neutral gas ionization. The experiment is carried out in the UCR T‐1 facility with an ice ball as the comet model. Photographs and data are taken with a variety of values of the solar wind velocity, interplanetary magnetic field (IMF), and comet configurations. The results show that the cometary neutral gas ionization depends on both the velocity of the solar wind and the interplanetary magnetic field. The plasma cloud surrounding the comet is visible only when the solar wind velocity and IMF are both above certain minimum values. This velocity dependent phenomena is explained by Alfvén's critical ionization velocity effect. The critical magnetic field may be explained by assuming two stream lower hybrid instability as a triggering mechanism for the ionization of the neutral gas by plasma flow. Critical upper and lower limits for the magnetic field, required by anomalous ionization, are also derived that satisfy the experimental observations.

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Section: Paper Number 89ja00147mentioning

confidence: 99%

Laboratory simulation of cometary neutral gas ionization

Chang

Rahman²,

White

1989

J. Geophys. Res.

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“…The first attempts at laboratory simulations of space phenomena were reviewed 11 by Podgorny and Sagdeev in 1970. Subsequent events were reviewed 12 by Kennel et al in the mid 1980's.…”

Section: Introductionmentioning

confidence: 99%

The design of laboratory experiments to produce collisionless shocks of cosmic relevance

Drake

2000

Physics of Plasmas

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Naturally occurring shocks transport energy and accelerate particles throughout the cosmos. The problem of producing collisionless shocks in the laboratory that are of relevance to such cosmic shocks is considered. Such an experiment must meet a number of constraints, several of which can be expressed by algebraic scaling relations. The relations for magnetization, plasma beta, Alfvén Mach number, temperature, magnetic field, and collisionality are described here. Taken together, the limits imposed by these constraints upon possible experiments are specified. The growth of magnetohydrodynamic (MHD) turbulence and the degree of particle acceleration are examined, demonstrating that it is feasible to contemplate studies of such phenomena in the laboratory. Finally, some discussion of how an experiment might meet the other qualitative constraints, and of how a laser might be used to drive the shock, is also included.

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“…These difficulties restrict the possibility of laboratory experiments to model collisionless cosmic plasma. However, astrophysical phenomena can be investigated in the framework of so called "restricted simulations" [28]. Indeed, in the 1960s, the large scale structure of the magnetotail (including the CS and magnetic reconnection on the night side, the deformation of the dipole magnetic field by plasma currents, and the magnetotail formation) was repro duced experimentally.…”

Section: Introductionmentioning

confidence: 99%