Low Energy Precipitating Electrons in the Diffuse Aurorae
Low Energy Precipitating Electrons in the Diffuse Aurorae
复制标题
漫射极光中的低能量沉淀电子
DOI：
10.1029/2019gl082383
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发表时间：
2019
影响因子：
5.2
通讯作者：
E. Zesta
中科院分区：
文献类型：
--
作者：
S. Wing;G. Khazanov;D. Sibeck;E. Zesta
极光电子沉淀通常分为三类：扩散的、单能的和宽带的。然而，一些沉淀电子不符合这三种类型中的任何一种，为了方便起见，这三种类型的电子都被假定为“漫射”电子。其中许多非定态电子在低能下表现出高通量。大多数研究认为，沉淀电子起源于磁层。然而，这种初级沉淀只是形成电子沉淀的第一步。初级沉淀产生二次电子，两个电子在共轭点之间多次反弹。因此，整个电子沉淀不仅由初级电子组成，而且由多次反射的初级和次级(MRPS)电子组成。用超热电子输运模型模拟了MRPS电子。模型数据的比较表明，非定态沉淀电子中的低能电子可以归因于MRPS电子。
Auroral electron precipitation is often classified into three categories: diffuse, monoenergetic, and broadband. However, some precipitating electrons do not fit any of the three categories, which are assumed to be “diffuse” electrons for convenience. Many of these nonconforming electrons exhibit high fluxes at low energies. Most studies assume that the precipitating electrons originate from the magnetosphere. However, this primary precipitation is only the first step in the formation of the electron precipitation. The primary precipitation creates secondary electrons and both electron populations bounce many times between the conjugate points. Thus, the full electron precipitation consists of not only the primary but the Multiply Reflected Primary and Secondary (MRPS) electrons. The MRPS electrons are modeled with Superthermal Electron Transport model. The model‐data comparisons suggest that the low energy electrons in the nonconforming precipitating electrons can be attributed to MRPS electrons.