Observations of velocity shear driven plasma turbulence. [from Hawkeye 1 satellite over Southern Hemisphere]
Observations of velocity shear driven plasma turbulence. [from Hawkeye 1 satellite over Southern Hemisphere]
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速度剪切驱动等离子体湍流的观测。
DOI：
10.1029/ja081i028p05114
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
P. Kintner
中科院分区：
文献类型：
--
作者：
P. Kintner
本文介绍了豪克耶1号在南半球上空椭圆轨道低空部分的静电和磁湍流观测结果。磁湍流被限制在极光区附近，与Heos 2在极尖的更高海拔看到的相似。静电湍流由功率谱指数为1.89 +或-0.26的背景分量和功率谱指数为2.80 +或-0.34的强分量组成。在对流等离子体流中，强烈的静电湍流和磁湍流与速度切变有关。由于速度剪切不稳定性是最不稳定的波矢量垂直于磁场，剪切相关的湍流预计是二维的字符，并有一个功率谱指数为3，这与观察到的强静电湍流。
Electrostatic and magnetic turbulence observations from Hawkeye 1 during the low-altitude portion of its elliptical orbit over the Southern Hemisphere are presented. The magnetic turbulence is confined near the auroral zone and is similar to that seen at higher altitudes by Heos 2 in the polar cusp. The electrostatic turbulence is composed of a background component with a power spectral index of 1.89 + or - 0.26 and an intense component with a power spectral index of 2.80 + or - 0.34. The intense electrostatic turbulence and the magnetic turbulence correlate with velocity shears in the convective plasma flow. Since velocity-shear instabilities are most unstable to wave vectors perpendicular to the magnetic field, the shear-correlated turbulence is anticipated to be two-dimensional in character and to have a power spectral index of 3, which agrees with that observed in the intense electrostatic turbulence.