Plasma vortices in the ionosphere and atmosphere

Nonlinear excitation of electrostatic and magnetostatic zero-frequency modes by finite-amplitude lower-hybrid waves is considered. It is found that modulational instabilities can give rise to enhanced plasma vortices. Dispersion relations, as well as analytical expressions for the growth rates, are obtained. The enhanced vortices may cause anomalous cross-field diffusion which can affect plasma confinement in tokamak devices when lower-hybrid waves are used for plasma heating or current drive. We found that magnetic fluctuations associated with the parametrically driven magnetostatic mode are of particular importance in tokamak plasmas.

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Evolution of small-scale magnetic elements in regions with plasma vortices in the solar photosphere

TECCIENCIA ◽

10.18180/tecciencia.2016.20.1 ◽

2016 ◽

Vol 11 (20) ◽

pp. 1-4 ◽

Cited By ~ 1

Author(s):

santiago Vargas Dominguez ◽

Judith Palacios ◽

Laura Balmaceda ◽

Iballa Cabello ◽

Vicente Domingo

Keyword(s):

Small Scale ◽

Solar Photosphere ◽

Magnetic Elements ◽

Plasma Vortices

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New observations of plasma vortices and insights into their interpretation

Geophysical Research Letters ◽

10.1029/gl010i008p00674 ◽

1983 ◽

Vol 10 (8) ◽

pp. 674-677 ◽

Cited By ~ 22

Author(s):

E. W. Hones ◽

J. Birn ◽

S. J. Bame ◽

C. T. Russell

Keyword(s):

Plasma Vortices

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Observations of plasma vortices in the vicinity of flow-braking: a case study

Annales Geophysicae ◽

10.5194/angeo-27-3009-2009 ◽

2009 ◽

Vol 27 (8) ◽

pp. 3009-3017 ◽

Cited By ~ 23

Author(s):

K. Keika ◽

R. Nakamura ◽

M. Volwerk ◽

V. Angelopoulos ◽

W. Baumjohann ◽

...

Keyword(s):

Magnetic Field ◽

Plasma Sheet ◽

Convective Flow ◽

Flow Patterns ◽

Plasma Flows ◽

Convective Flows ◽

Field Fluctuations ◽

Plasma Vortices

Abstract. We examine fast plasma flows and magnetic field fluctuations observed by THEMIS at 03:00–03:30 UT on 12 December 2007. All THEMIS probes are situated in the near-Earth plasma sheet (XSM>−10 RE) with 1–2 RE spacecraft separations in azimuthal and radial directions. We focus on the observations of plasma convective flows made simultaneously by more than one THEMIS probe. At about 03:10 UT and 03:14 UT, the THEMIS P2 probe observed earthward flows of >100 km/s. The THEMIS P1 probe, located duskward and earthward of P2, observed tailward flows under a positive Bz. The inner most probe THEMIS P4, located at almost the same MLT as THEMIS P1 and P2, did not see any clear flow. We examine the convective flow patterns for the THEMIS observations. We conclude that plasma vortices are formed near the region where the earthward flows slow down and turn in azimuthal directions.

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Plasma Vortices and Chaos in Velocity Gradient Driven Electromagnetic Fluctuations

Physica Scripta ◽

10.1238/physica.topical.082a00020 ◽

1999 ◽

Vol T82 (1) ◽

pp. 20 ◽

Cited By ~ 1

Author(s):

G. Murtaza ◽

A. M. Mirza ◽

T. Rafiq ◽

P. K. Shukla

Keyword(s):

Velocity Gradient ◽

Plasma Vortices

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Plasma vortices and their relation to cross-field diffusion: A laboratory study

Physical Review Letters ◽

10.1103/physrevlett.64.3023 ◽

1990 ◽

Vol 64 (25) ◽

pp. 3023-3026 ◽

Cited By ~ 16

Author(s):

T. Huld ◽

A. H. Nielsen ◽

H. L. Pécseli ◽

J. Juul Rasmussen

Keyword(s):

Laboratory Study ◽

Field Diffusion ◽

Plasma Vortices

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Ion-acoustic wave induced convective cells

Journal of Plasma Physics ◽

10.1017/s0022377800026222 ◽

1981 ◽

Vol 25 (3) ◽

pp. 451-457 ◽

Cited By ~ 2

Author(s):

P. K. Shukla ◽

M. Y. Yu

Keyword(s):

Acoustic Wave ◽

Growth Rates ◽

Modulational Instability ◽

Finite Amplitude ◽

Two Dimensional ◽

Ion Acoustic Wave ◽

Ion Acoustic ◽

Convective Cells ◽

Plasma Vortices ◽

Wave Induced

It is shown that a finite-amplitude ion-acoustic wave in a uniform magneto- plasma can enhance two-dimensional plasma vortices. The latter results from a modulational instability. The growth rates are obtained analytically.

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