Typical values of the electric drift E × B/B2 in the inner radiation belt and slot region as determined from Van Allen Probe measurements
Typical values of the electric drift E × B/B2 in the inner radiation belt and slot region as determined from Van Allen Probe measurements
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根据 Van Allen 探针测量确定的内辐射带和槽区域中的电漂移 E × B/B2 的典型值
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
F. Mozer
中科院分区：
文献类型：
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作者：
S. Lejosne;F. Mozer
电漂移E × B/B2是描述等离子体流动和粒子加速的基础。然而，由于缺乏可靠的现场测量，它在内带和槽区并不为人所知。本文分析了2012年9月至2014年12月用范艾伦探头A和B测量的L ~ 3以下的电漂移。目的是确定赤道电漂移的径向和方位向的典型分量。考察了各分量与径向距离、磁当地时和地理经度的依赖关系。结果表明，在L ~ 2.6以下有5~10%的典型自转滞后，在S ~ 1以下有2 0 m−1的轻微径向输运.电漂移场的磁局部时间依赖于L ~ 2以下的电离层风力发电机和L ~ 2上方的太阳风驱动的对流电场.还发现电场的二次纵向依赖关系.因此，这项工作也证明了范艾伦探测器上的仪器能够准确地测量L ~ 3以下的电漂移。
The electric drift E × B/B2 plays a fundamental role for the description of plasma flow and particle acceleration. Yet it is not well‐known in the inner belt and slot region because of a lack of reliable in situ measurements. In this article, we present an analysis of the electric drifts measured below L ~ 3 by both Van Allen Probes A and B from September 2012 to December 2014. The objective is to determine the typical components of the equatorial electric drift in both radial and azimuthal directions. The dependences of the components on radial distance, magnetic local time, and geographic longitude are examined. The results from Van Allen Probe A agree with Van Allen Probe B. They show, among other things, a typical corotation lag of the order of 5 to 10% below L ~ 2.6, as well as a slight radial transport of the order of 20 m s−1. The magnetic local time dependence of the electric drift is consistent with that of the ionosphere wind dynamo below L ~ 2 and with that of a solar wind‐driven convection electric field above L ~ 2. A secondary longitudinal dependence of the electric field is also found. Therefore, this work also demonstrates that the instruments on board Van Allen Probes are able to perform accurate measurements of the electric drift below L ~ 3.