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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Ionospheric electron upflow in the polar cap region: Derived from ISIS 2 measurements
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Ionospheric electron upflow in the polar cap region: Derived from ISIS 2 measurements

机译：电离层电子上升气流在极地冰冠地区:来自伊希斯2测量

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摘要

Using the mass conservation equation, the parallel electron upflow velocity normalized by the base velocity in the polar cap region of the topside ionosphere is derived as a function of electron density and neutral species densities. The normalized parallel velocity profiles are evaluated using ISIS 2 electron density observations and neutral species density profiles from the MSIS model. From the cases analyzed, the derived velocity profiles show a similar trend of (a) a region of slow acceleration below an altitude of ～500 km, (b) a region of fast acceleration (～500 km–1100 km), and (c) another region of weak or no acceleration (>～1100 km). A simple analytical function is proposed to empirically describe the normalized parallel velocity profile. The parameters in the function have been determined by a multivariate least squares fit of calculated profiles to the analytical expression. These parameters define the magnitude and the height of maximum acceleration. For the cases studied the maximum acceleration height occurred in the range of 731–908 km. The parallel velocity can increase by a factor of up to 6 within the acceleration region. The results from the cases studied suggest that the chosen analytical function suitably describes the normalized parallel electron velocity in the high-latitude topside ionosphere. Furthermore, the acceleration mechanisms have been investigated using the electron momentum equation. On the basis of an existing model of the electron temperature, our results suggest that the enhanced pressure gradient force may be the main driver of the observed acceleration in the electron upflow.
机译：利用质量守恒方程,平行电子上升气流速度规范化的基础速度的极冠区上部电离层是电子导出的函数密度和中性物种密度。归一化并行速度概要文件评估使用伊希斯2电子密度观察和中性物种密度配置文件从msi模型。派生的速度资料显示类似的趋势(一)地区下面的缓慢加速~ 500公里,高度(b)快速的地区加速度(~ 500公里- 1100公里),和(c)地区的薄弱或没有加速度(> ~ 1100公里)。提出了简单的解析函数实证描述并行规范化速度剖面。一直由多元最少广场的计算资料分析表达式。最大的大小和高度加速度。加速发生在高度的范围731 - 908公里。6倍的加速度地区。建议选择的解析函数适当描述了标准化的平行电子速度在高纬度地区居首位电离层。研究了使用机制电子动量方程。现有模型的电子温度,我们结果表明,增强的压力梯度力的主要原因观察加速电子上升气流。

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