Pulsating auroras: Evidence for noncollisional thermalization of precipitating electrons
Pulsating auroras: Evidence for noncollisional thermalization of precipitating electrons
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脉动极光：沉淀电子非碰撞热化的证据
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
T. Hallinan
中科院分区：
文献类型：
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作者：
H. Stenbaek;T. Hallinan
用立体电视系统进行的观测表明，许多脉动极光的垂直范围不到2公里。这比根据沉淀电子与大气之间的碰撞计算得出的结果要小得多。假设脉动极光是由沉淀的电子引起的，数据表明，位于大多数脉动观测到的较低E区(90-107公里)的非碰撞相互作用可能在粒子热化中起主导作用。接近的脉动形态可能在不同的高度，但脉动极光总是出现在比散布的非脉动形态更低的海拔上。在单个脉动期间以及在一系列类似的脉冲之间，高度基本上是恒定的，但所有脉动的平均高度似乎在黎明时增加。
Observations with a stereo television system show that many pulsating auroras have vertical extents of less than 2 km. This is significantly less than has been calculated based on collisions between precipitating electrons and the atmosphere. Assuming that the pulsating auroras are caused by precipitating electrons, the data suggest that noncollisional interactions, localized in the lower E region (90–107 km), where most of the pulsations are observed, may play a dominant role in thermalizing the particles. Proximate pulsating forms may be at different altitudes, but invariably, the pulsating auroras appear at lower altitudes than interspersed nonpulsating forms. The altitude is essentially constant during an individual pulsation as well as between succeeding similar pulses in a series, but the average altitude of all pulsations appears to increase toward dawn.