Su Zhenpeng, Zhu Hui, Xiao Fuliang, Zong Q-G, Zhou X-Z, Zheng Huinan, Wang Yuming, Wang Shui, Hao Y-X, Gao Zhonglei, He Zhaoguo, Baker D N, Spence H E, Reeves G D, Blake J B, Wygant J R
CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China.
Collaborative Innovation Center of Astronautical Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China.
Nat Commun. 2015 Dec 22;6:10096. doi: 10.1038/ncomms10096.
Van Allen radiation belts are typically two zones of energetic particles encircling the Earth separated by the slot region. How the outer radiation belt electrons are accelerated to relativistic energies remains an unanswered question. Recent studies have presented compelling evidence for the local acceleration by very-low-frequency (VLF) chorus waves. However, there has been a competing theory to the local acceleration, radial diffusion by ultra-low-frequency (ULF) waves, whose importance has not yet been determined definitively. Here we report a unique radiation belt event with intense ULF waves but no detectable VLF chorus waves. Our results demonstrate that the ULF waves moved the inner edge of the outer radiation belt earthward 0.3 Earth radii and enhanced the relativistic electron fluxes by up to one order of magnitude near the slot region within about 10 h, providing strong evidence for the radial diffusion of radiation belt relativistic electrons.
范艾伦辐射带通常是环绕地球的两个高能粒子区域，由槽区隔开。外辐射带电子如何被加速到相对论能量仍是一个未解之谜。最近的研究为甚低频（VLF）合声波的局部加速提供了令人信服的证据。然而，对于局部加速存在一种与之竞争的理论，即超低频（ULF）波的径向扩散，其重要性尚未得到明确确定。在此，我们报告了一个独特的辐射带事件，该事件伴有强烈的ULF波，但未检测到VLF合声波。我们的结果表明，ULF波使外辐射带的内边缘向地球方向移动了0.3个地球半径，并在约10小时内在槽区附近将相对论电子通量提高了一个数量级，为辐射带相对论电子的径向扩散提供了有力证据。
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