Driving of Outer Belt Electron Loss by Solar Wind Dynamic Pressure Structures: Analysis of Balloon and Satellite Data
Driving of Outer Belt Electron Loss by Solar Wind Dynamic Pressure Structures: Analysis of Balloon and Satellite Data
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DOI：
10.1029/2020ja028097
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发表时间：
2020-11
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通讯作者：
A. Breneman;A. Halford;R. Millan;L. Woodger;X.‐J. Zhang;J. Sandhu;L. Capannolo;W. Li;Q. Ma;C. Cully;K. Murphy;T. Brito;S. Elliott
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作者：
A. Breneman;A. Halford;R. Millan;L. Woodger;X.‐J. Zhang;J. Sandhu;L. Capannolo;W. Li;Q. Ma;C. Cully;K. Murphy;T. Brito;S. Elliott
我们给出了从外辐射带驱动大尺度相干~20-100keV电子损失的~10-60分钟太阳风动压结构的观测结果。2014年1月11日至12日对辐射带相对论电子损失(Barrel)的同时卫星和气球阵列观测表明，从Barrel X射线推断的气压结构与降水之间存在密切联系。具体地说，这些结构驱动电子的径向ExB输运，最大可达1个地球半径，调制可用于低频等离子体层HISS生长的自由电子能量，以及随后的HISS诱导的损失锥体散射。动压结构起源于太阳附近，通常被观测到与太阳风一起平流，因此能够在大空间尺度上通过嘶嘶声开启电子的散射损失。我们的结果提供了太阳风压力波动和外辐射带电子损失调制之间的直接联系，并可能解释在桶数据集中常见的X射线的长周期调制和大尺度相干性。
We present observations of ~10–60 min solar wind dynamic pressure structures that drive large‐scale coherent ~20–100 keV electron loss from the outer radiation belt. A combination of simultaneous satellite and Balloon Array for Radiation‐belt Relativistic Electron Losses (BARREL) observations on 11–12 January 2014 shows a close association between the pressure structures and precipitation as inferred from BARREL X‐rays. Specifically, the structures drive radial ExB transport of electrons up to 1 Earth radii, modulating the free electron energy available for low‐frequency plasmaspheric hiss growth, and subsequent hiss‐induced loss cone scattering. The dynamic pressure structures, originating near the Sun and commonly observed advecting with the solar wind, are thus able to switch on scattering loss of electrons by hiss over a large spatial scale. Our results provide a direct link between solar wind pressure fluctuations and modulation of electron loss from the outer radiation belt and may explain long‐period modulations and large‐scale coherence of X‐rays commonly observed in the BARREL data set.