Saturn's Plasma Density Depletions Along Magnetic Field Lines Connected to the Main Rings

Farrell W. M.; Hadid L. Z.; Morooka M. W.; Kurth W. S.; Wahlund J.‐E.; MacDowall R. J.; Sulaiman A. H.; Persoon A. M.; Gurnett D. A.

摘要

Abstract > We report on a set of clear and abrupt decreases in the high‐frequency boundary of whistler mode emissions detected by Cassini at high latitudes (about ±40°) during the low‐altitude proximal flybys of Saturn. These abrupt decreases or dropouts have start and stop locations that correspond to L shells at the edges of the A and B rings. Langmuir probe measurements can confirm, in some cases, that the abrupt decrease in the high‐frequency whistler mode boundary is associated with a corresponding abrupt electron density dropout over evacuated field lines connected to the A and B rings. Wideband data also reveal electron plasma oscillations and whistler mode cutoffs consistent with a low‐density plasma in the region. The observation of the electron density dropout along ring‐connecting field lines suggests that strong ambipolar forces are operating, drawing cold ionospheric ions outward to fill the flux tubes. There is an analog with the refilling of flux tubes in the terrestrial plasmasphere. We suggest that the ring‐connected electron density dropouts observed between 1.1 and 1.3? R <sub> s </sub> are connected to the low‐density ring plasma cavity observed overtop the A and B rings during the 2004 Saturn orbital insertion pass. </abstract> </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> >我们报告惠斯勒模式高频边界中的一组清晰且突然减小Cassini在土星的低空近端蜘蛛处以高纬度（约±40°）检测到的排放。这些突然的减小或辍学具有对应于A和B环边缘的壳体的开始和停止位置。在某些情况下，Langmuir探针测量可以确认高频吹奏模式边界的突然减小与相应的突然的电子密度丢失相关，并在连接到A和B环的疏散场线上。宽带数据还揭示了电子等离子体振荡和吹口石模式截止，该频率模式与该区域的低密度等离子体一致。沿着环连接磁场线的电子密度辍学的观察表明，强的余渣力是操作的，向外拉伸冷电离层离子以填充磁通管。在地面玻片子中重新填充助焊剂管的类似物。我们建议在1.1和1.3之间观察到的环连接的电子密度丢失？ R </ i> <sub> s </ s> </ sub>连接到低密度环等离子体腔观察到2004年土星轨道插入通道中的a和b环。 </ p> </ abstract> </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>2018年第16期</span><b style="margin: 0 2px;">|</b> <span>共7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=Farrell W. M.&option=202" target="_blank" rel="nofollow">Farrell W. M.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hadid L. Z.&option=202" target="_blank" rel="nofollow">Hadid L. Z.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Morooka M. W.&option=202" target="_blank" rel="nofollow">Morooka M. W.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kurth W. S.&option=202" target="_blank" rel="nofollow">Kurth W. S.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wahlund J.‐E.&option=202" target="_blank" rel="nofollow">Wahlund J.‐E.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=MacDowall R. J.&option=202" target="_blank" rel="nofollow">MacDowall R. J.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sulaiman A. H.&option=202" target="_blank" rel="nofollow">Sulaiman A. H.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Persoon A. M.&option=202" target="_blank" rel="nofollow">Persoon A. M.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Gurnett D. A.&option=202" target="_blank" rel="nofollow">Gurnett D. A.;</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>NASA Goddard Space Flight CenterGreenbelt MD USA;</p> <p>Swedish Institute of Space PhysicsUppsala Sweden;</p> <p>Swedish Institute of Space PhysicsUppsala Sweden;</p> <p>Department of Physics and AstronomyUniversity of IowaIowa City IA USA;</p> <p>Swedish Institute of Space PhysicsUppsala Sweden;</p> <p>NASA Goddard Space Flight CenterGreenbelt MD USA;</p> <p>Department of Physics and AstronomyUniversity of IowaIowa City IA USA;</p> <p>Department of Physics and AstronomyUniversity of IowaIowa City IA USA;</p> <p>Department of Physics and AstronomyUniversity of IowaIowa City IA USA;</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=Saturn&option=203" rel="nofollow">Saturn;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Cassini&option=203" rel="nofollow">Cassini;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=rings&option=203" rel="nofollow">rings;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=plasma&option=203" rel="nofollow">plasma;</a> </p> <div class="translation"> 机译：土星;卡西尼;环;等离子体; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704019851530.html">Saturn's Plasma Density Depletions Along Magnetic Field Lines Connected to the Main Rings</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Farrell W. 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Yu Zhiyong</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=于志勇&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,于志勇</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ming Julan&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,Ming Julan</a> <span> <a href="/conference-cn-65153/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 中国电机工程学会2017年全国电工理论与新技术学术年会 </a> <span> <span> . 2017</span> </span> </div> </li> <li> <div> <b>7. </b><a class="enjiyixqcontent" href="/academic-degree-domestic_mphd_thesis/020312820441.html">Morita Context环的（主）拟-Baer环构成条件</a> <b>[A] </b> <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=李婧&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor"> . 李婧</a> <span> . 2010</span> </span> </div> </li> </ul> <ul style="display: none;"> <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/patent-detail/06120108405987.html">采用为使主电池更快速充电而断开耗尽的辅助电池的方法的混合动力车辆</a> <b>[P]</b> . <span> 中国专利： CN105917548A </span> <span> . 2016-08-31</span> </div> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/patent-detail/061204295278.html">主轧芯辊系统、轧环机及轧环机径向主轧芯辊角度调整方法</a> <b>[P]</b> . <span> 中国专利： CN112222336B </span> <span> . 2021.03.19</span> </div> </li> <li> <div> <b>3. </b><a class="enjiyixqcontent" href="/patent-detail/06130450003844.html">Device for the bundles of field lines of a primary magnetic field to a secondary magnetic field of increased density of the field lines with spirally extending field lines</a> <b>[P]</b> . <span> 外国专利：  DE29914387U1 </span> <span> . 1999-12-30</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：用螺旋延伸的场线将初级磁场的场线束增强为场线密度的次级磁场的装置 </span> </p> </li> <li> <div> <b>4. </b><a class="enjiyixqcontent" href="/patent-detail/06130448214204.html">Concentrating field lines of primary magnetic field in non-ferromagnetic material or in vacuum to form secondary magnetic field of increased flux density and with helical field lines</a> <b>[P]</b> . <span> 外国专利：  DE19939001A1 </span> <span> . 2001-03-15</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：在非铁磁性材料或真空中集中一次磁场的磁场线，以形成具有增加的磁通密度的二次磁场和螺旋磁场线 </span> </p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130438906482.html">Electromagnetic actuator for e.g. relay, has secondary magnets perpendicular to main magnet, to channel magnetic field lines of main magnet towards center of inner space of magnetic assemblies, where lines are concentrated in zone of space</a> <b>[P]</b> . <span> 外国专利：  FR2868870A1 </span> <span> . 2005-10-14</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：电磁执行器继电器，具有与主磁体垂直的辅助磁体，以将主磁体的磁力线引向磁性组件内部空间的中心，其中磁力线集中在空间区域中 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 class="all_title" id="enpatent55">相关主题</h3> <ul id="subject"> </ul> </div> </div> </div> </div> <div class="right rightcon"> <div class="details_img cardcommon clearfix" style="margin-bottom: 10px;display:none;" > </div> </div> </div> <div id="thesis_get_original1" class="downloadBth" style="bottom: 19px;z-index: 999;" onclick="ywcd('0704019851530','4',7,2,1,'',this,24)" class="delivery" prompt="010401" title="通过人工服务将文献原文发送至邮箱" >获取原文</div> <div class="journalsub-pop-up" style="display: none"> <div class="journal-sub"> <h2>期刊订阅</h2> <img src="https://cdn.zhangqiaokeyan.com/img/loginclose.png" alt="关闭" onclick="$('.journalsub-pop-up').hide()"> <p 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