论文标题
地球弓震中的双层
Double layers in the Earth's bow shock
论文作者
论文摘要
我们介绍了准垂直地球的弓形双层的磁层多尺度观察。这些双层主要平行电场，幅度高达100 mV/m，空间宽度为50-700 m，等离子框架速度在100 km/s以内。单个双层的电势下降是De Hoffmann Teller框架中交叉冲击电位的2-7％，并且发生在十个Debye长度或电子惯性长度的十分之一的空间尺度上。一些双层的空间宽度可能为70个debye长度，潜在的降低了跨冲击电位的30％。在双层上观察到的电子温度变化与它们的潜在降低大致一致。尽管地球弓冲击中的电子加热主要是由于de Hoffmann-Teller框架中的准静电电场而发生的，但这些观察结果表明，在Debye尺度静电结构中，电子温度也可以升高。
We present Magnetospheric Multiscale observations of electrostatic double layers in quasi-perpendicular Earth's bow shock. These double layers have predominantly parallel electric field with amplitudes up to 100 mV/m, spatial widths of 50-700 m, and plasma frame speeds within 100 km/s. The potential drop across a single double layer is 2-7% of the cross-shock potential in the de Hoffmann-Teller frame and occurs over the spatial scale of ten Debye lengths or one tenth of electron inertial length. Some double layers can have spatial width of 70 Debye lengths and potential drop up to 30% of the cross-shock potential. The electron temperature variation observed across double layers is roughly consistent with their potential drop. While electron heating in the Earth's bow shock occurs predominantly due to the quasi-static electric field in the de Hoffmann-Teller frame, these observations show that electron temperature can also increase across Debye-scale electrostatic structures.
