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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Rapid flux transport in the central plasma sheet
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Rapid flux transport in the central plasma sheet

机译：中央等离子体板中的快速通量传输

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On the basis of several years of Geotail data we performed a comprehensive statistical analysis of rapid convective transport in the neartail and midtail central plasma sheet. We chose a new approach by using flux transport and not ion bulk velocity as the threshold parameter for the identification of rapid flows. This criterion for rapid convection is independent of the radial distance from the Earth. We found that the occurrence rate of earthward rapid flux transport events was constant at radial distances > 15 R-E and that it started to drop only earthward of 15 R-E. Tailward rapid flux transport events with B-z < 0 were extremely rare inside of 20 R-E. Their occurrence rate increased strongly beyond that distance. Tailward directed events with B-z > 0 could be seen at all distances. Their occurrence rate has a minimum at radial distances between 20 and 30 R-E and increases earthward and tailward of that region. They are likely to have a different nature and different origins in the near-Earth region and in the midtail beyond about 25-30 R-E. In close analogy to bursty bulk flows we defined rapid convection events by using the flux transport criterion instead of a velocity criterion. We found that rapid convection events transport about the same amount of mass, energy, and magnetic flux and have about the same duration at all radial distances between 10 and 50 R-E. We found that rapid convection was responsible for 30-50% of the observed total transport of mass, energy, and magnetic flux past Geotail at all observed distances in the central plasma sheet. [References: 27]
机译：基于几年的Geotail数据，我们对近尾和中尾中央血浆片中的快速对流传输进行了全面的统计分析。我们选择了一种新的方法，通过使用通量传输而不是离子体积速度作为识别快速流的阈值参数。快速对流的这一标准与距地球的径向距离无关。我们发现，在径向距离> 15 R-E处，向地球的快速通量传输事件的发生率是恒定的，并且仅开始向地球的15 R-E方向下降。在20 R-E内极少发生B-z <0的尾部快速通量传输事件。超过该距离，它们的发生率大大增加。可以在所有距离看到B-z> 0的尾巴定向事件。它们的发生率在20和30 R-E之间的径向距离处最小，并向该区域的向后和向后增加。它们可能在近地区域和中尾超过约25-30 R-E处具有不同的性质和不同的起源。与突发性大流量相似，我们使用通量传输准则而不是速度准则来定义快速对流事件。我们发现快速对流事件在10至50 R-E之间的所有径向距离上传输的质量，能量和磁通量大致相同，并且持续时间也相同。我们发现，快速对流是在中央等离子体板中所有观察到的距离处观测到的质量，能量和磁通量通过Geotail的总传输量的30-50％。 [参考：27]

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