Bounce Resonance Scattering of Radiation Belt Electrons by Low‐Frequency Hiss: Comparison With Cyclotron and Landau Resonances

Cao Xing; Ni Binbin; Summers Danny; Zou Zhengyang; Fu Song; Zhang Wenxun

摘要

Abstract > Bounce resonant interactions with magnetospheric waves have been proposed as an important contributing mechanism for scattering near‐equatorially mirroring electrons by violating the second adiabatic invariant associated with the electron bounce motion along a geomagnetic field line. This study demonstrates that low‐frequency plasmaspheric hiss with significant wave power below 100?Hz can bounce resonate efficiently with radiation belt electrons. By performing quantitative calculations of pitch angle scattering rates, we show that low‐frequency hiss‐induced bounce resonant scattering of electrons has a strong dependence on equatorial pitch angle type="mathematics"> <fi>α</fi> <sub>eq</sub> . For electrons with type="mathematics"> <fi>α</fi> <sub>eq</sub> close to 90°, the timescale associated with bounce resonance scattering can be comparable to or even less than 1?h. Cyclotron and Landau resonant interactions between low‐frequency hiss and electrons are also investigated for comparisons. It is found that while the bounce and Landau resonances are responsible for the diffusive transport of near‐equatorially mirroring electrons to lower type="mathematics"> <fi>α</fi> <sub>eq</sub> , pitch angle scattering by cyclotron resonance could take over to further diffuse electrons into the atmosphere. Bounce resonance provides a more efficient pitch angle scattering mechanism of relativistic ( type="mathematics">≥ 1?MeV) electrons than Landau resonance due to the stronger scattering rates and broader resonance coverage of type="mathematics"> <fi>α</fi> <sub>eq</sub> , thereby demonstrati </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“Main”XML：Lang =“en”> <标题类型=“main”>抽象</ title> >与磁体波的反射谐振相互作用被提出为近赤行散射的重要贡献机制通过沿着地磁场线违反与电子弹跳运动相关联的第二绝热不变，镜像电子。本研究表明，低频等离子体主体在100°Hz下具有显着波动功率的低频等离子体嘶嘶声可以通过辐射带电子有效地弹起来。通过执行俯仰角散射速率的定量计算，我们表明，低频HISS诱导的电子反弹谐振散射散射对赤道螺距角度<跨度=“数学”> <FI>α</ Fi> <sub > eq </ sub> </ span>。对于带<跨度类型=“数学”的电子> <fi>α</ fi> <sub> eq </ sub> </ span>接近90°，与反弹共振散射相关的时间尺度可以与甚至更少超过1？h。还研究了低频嘶嘶声和电子之间的回旋加速器和Landau共振相互作用以进行比较。结果发现，虽然反弹和Landau共振负责近赤道镜像电子的扩散运输到下较低的<跨度型=“数学”> <FI>α</ Fi> <sub> eq </ sub> </ SPAN>，通过回旋谐振的俯仰角散射可能接管进一步将电子进入大气中。反弹谐振提供了一种更有效的俯仰角散射机制的相对论（<跨度=“数学”>≥</跨度> 1？1？MEV），而不是Landau共振，由于<跨度类型=“更广泛的共振覆盖范围=”数学“> <fi>α</ fi> <sub> eq </ sub> </ span>，从而证明 </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-23539/'>《Geophysical Research Letters》</a> <b style="margin: 0 2px;">|</b><span>2017年第19期</span><b style="margin: 0 2px;">|</b><span>共8页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Cao Xing&option=202" target="_blank" rel="nofollow">Cao Xing;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ni Binbin&option=202" target="_blank" rel="nofollow">Ni Binbin;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Summers Danny&option=202" target="_blank" rel="nofollow">Summers Danny;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zou Zhengyang&option=202" target="_blank" rel="nofollow">Zou Zhengyang;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Fu Song&option=202" target="_blank" rel="nofollow">Fu Song;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zhang Wenxun&option=202" target="_blank" rel="nofollow">Zhang Wenxun;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Department of Space Physics School of Electronic InformationWuhan UniversityWuhan China;</p> <p>Department of Space Physics School of Electronic InformationWuhan UniversityWuhan China;</p> <p>Department of Mathematics and StatisticsMemorial University of NewfoundlandSt. John's Newfoundland and Labrador Canada;</p> <p>Department of Space Physics School of Electronic InformationWuhan UniversityWuhan China;</p> <p>Department of Space Physics School of Electronic InformationWuhan UniversityWuhan China;</p> <p>Department of Space Physics School of Electronic InformationWuhan UniversityWuhan China;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=wave‐particle interactions&option=203" rel="nofollow">wave‐particle interactions;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=low‐frequency hiss&option=203" rel="nofollow">low‐frequency hiss;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=radiation belt dynamics&option=203" rel="nofollow">radiation belt dynamics;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=bounce resonance&option=203" rel="nofollow">bounce resonance;</a> </p> <div class="translation"> 机译：波粒子相互作用;低频嘶嘶声;辐射带动力学;弹跳共振; 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