Electron Microburst Size Distribution Derived With AeroCube‐6

Electron Microburst Size Distribution Derived With AeroCube‐6
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使用 AeroCube 得出的电子微爆尺寸分布 6

DOI:
10.1029/2019ja027651
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发表时间:
2020
期刊:
Journal of Geophysical Research: Space Physics
影响因子:
--
通讯作者:
Claudepierre, S. G.
Claudepierre, S. G.
中科院分区:
--
文献类型:
--
作者:
Shumko, M.;Johnson, A. T.;Sample, J. G.;Griffith, B. A.;Turner, D. L.;O'Brien, T. P.;Agapitov, O.;Blake, J. B.;Claudepierre, S. G.

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微暴流是电子从辐射带进入大气层的脉冲增加,在低地球轨道和高层大气中直接观测到。先前的工作估计,微暴流能够迅速耗尽辐射带电子的顺序一天,因此,它们的作用,辐射带电子损失必须考虑。由于微下击暴流造成的损失没有得到很好的限制,需要做更多的工作来准确地量化它们作为损失过程的贡献。为了解决这个问题,我们使用AeroCube‐6 CubeSat对35 keV微下击暴流大小进行了统计研究。利用这两个航天器得到了低地球轨道和磁赤道上的微下击暴流尺度分布。在低地球轨道上,大多数微暴流都被观测到,而AeroCube-6的间隔小于几十公里,主要是在纬度上。为了解释随机微下击暴流位置和大小的统计效应,开发了蒙特卡罗和分析模型来测试假设的微下击暴流大小分布。对一类微下击暴流尺度分布进行了检验,并利用马尔可夫链蒙特卡罗抽样器对模型参数的最优分布进行了估计。最后,大多数观测到的微暴流在磁赤道上的大小小于200公里。由于微暴流被广泛认为是由辐射带电子的哨声模式波的散射产生的,所观察到的微暴流的大小分布相比,哨声模式合唱团的大小分布在以前的文献中。
Microbursts are an impulsive increase of electrons from the radiation belts into the atmosphere and have been directly observed in low Earth orbit and the upper atmosphere. Prior work has estimated that microbursts are capable of rapidly depleting the radiation belt electrons on the order of a day; hence, their role to radiation belt electron losses must be considered. Losses due to microbursts are not well constrained, and more work is necessary to accurately quantify their contribution as a loss process. To address this question, we present a statistical study of 35 keV microburst sizes using the pair of AeroCube‐6 CubeSats. The microburst size distribution in low Earth orbit and the magnetic equator was derived using both spacecraft. In low Earth orbit, the majority of microbursts were observed, while the AeroCube‐6 separation was less than a few tens of kilometers, mostly in latitude. To account for the statistical effects of random microburst locations and sizes, Monte Carlo and analytic models were developed to test hypothesized microburst size distributions. A family of microburst size distributions were tested, and a Markov chain Monte Carlo sampler was used to estimate the optimal distribution of model parameters. Finally, a majority of observed microbursts map to sizes less than 200 km at the magnetic equator. Since microbursts are widely believed to be generated by scattering of radiation belt electrons by whistler mode waves, the observed microburst size distribution was compared to whistler mode chorus size distributions derived in prior literature.
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