Double layers and density cavitons in downward current region of aurora

liao jingjing; chen liang; mao yimin

Volume 23 Issue 10

Nov. 2011

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Article Navigation > High Power Laser and Particle Beams > 2011 > 23(10): 0-

zhang yunwang, sun jingyuan, chen jing, et al. Control of surface quality of sub-millimeter cylindrical gold targets[J]. High Power Laser and Particle Beams, 2010, 22.

Citation:

liao jingjing, chen liang, mao yimin. Double layers and density cavitons in downward current region of aurora[J]. High Power Laser and Particle Beams, 2011, 23.

zhang yunwang, sun jingyuan, chen jing, et al. Control of surface quality of sub-millimeter cylindrical gold targets[J]. High Power Laser and Particle Beams, 2010, 22.

Citation:

liao jingjing, chen liang, mao yimin. Double layers and density cavitons in downward current region of aurora[J]. High Power Laser and Particle Beams, 2011, 23.

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Double layers and density cavitons in downward current region of aurora

1.
Department of Information Engineering,College of Applied Science,Jiangxi University of Science and Technology,Ganzhou 341000,China

Publish Date: 2011-10-15

Abstract

Abstract

The nonlinear coupling equations of low-frequency potential, high-frequency modulation field and density disturbance in strong turbulent plasmas were numerically calculated in the static limit case. The evolutions of double layers and density cavitons were obtained. The results show that the double layer in downward current region of aurora is formed by localized drop in density owing to collapsed high frequency field. The structure is a double-double layer and a nonlinear entity: caviton. The ramp potential of the double layer is in range of 14 to 40 V, and the thickness of the structure is between 100 and 200 m, roughly tens of Debye lengths; the maximum density perturbation rate is up to more than 80%, which are all in harmony with the measurements by the Fast Auroral Snapshot satellite
- electric double layer,
- density caviton,
- plasma,
- aurora,
- numerical calculation

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