Pseudo altitude: A new perspective on the auroral density cavity

Pseudo altitude: A new perspective on the auroral density cavity
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伪高度:极光密度腔的新视角

DOI:
10.1002/jgra.50408
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发表时间:
2013
期刊:
Space Physics
影响因子:
--
通讯作者:
Alm L
Alm L
中科院分区:
--
文献类型:
--
作者:
Alm L

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研究极光密度空腔内的密度分布是复杂的,因为很难在不同高度的同一流量管内同时进行测量。不同事件之间的比较由于密度空腔的位置和相关潜在结构的位置的变化而变得复杂。描述航天器在密度空腔内相对于潜在结构而不是地球的位置提供了一个更实际和一致的参考框架,即伪高度。通过比较航天器上方的电位降(由向下电子的特征能量确定)和航天器下方的平行电位降(由向上离子的特征能量确定),确定伪高度。伪高度0对应于潜在结构的底部,伪高度1对应于结构的顶部。我们选取了2008年的7个事件,每个事件都对应于一个主要是准静态势结构的星团交叉。所有的事件都表现出一致的伪高度和电子密度之间的关系。没有上限的密度空腔可以观察到,而所有的空腔都有一个低于0.33的伪高度。这些观测结果表明,极光密度腔主要集中在准静态位结构的上部。
Studying the density distribution inside the auroral density cavity is complicated by the difficulties in achieving simultaneous measurements within the same flux tube at different altitudes. Comparisons between different events are complicated by variations in both the location of the density cavity and the location of the related potential structure. Describing the spacecraft's location inside the density cavity relative to the potential structure instead of the Earth offers a more practical and consistent frame of reference, a pseudo altitude. The pseudo altitude is determined by comparing the potential drop above the spacecraft, as determined from the characteristic energy of the downward electrons, with the parallel potential drop below the spacecraft, determined from the characteristic energy of the upward ions. A pseudo altitude of 0 corresponds to the bottom of the potential structure and a pseudo altitude of 1 to the top of the structure. Seven events from 2008 were selected, each of which corresponds to a Cluster crossing of a mainly quasi‐static potential structure. All of the events exhibit a consistent anticorrelation between the pseudo altitude and the electron density. No upper limit of the density cavity can be observed, while all cavities have a lower limit above a pseudo altitude of 0.33. These observations show that the auroral density cavity is predominately concentrated to the upper parts of the quasi‐static potential structure.
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