Survey of Cold Plasma Blobs in Jupiter's Magnetosphere: Evidence for Centrifugal Instabilities

IF 4 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Jian-zhao Wang, Fran Bagenal, Robert J. Wilson, Peter A. Delamere, Robert W. Ebert, Philip W. Valek, Frederic Allegrini, Jamey R. Szalay
{"title":"Survey of Cold Plasma Blobs in Jupiter's Magnetosphere: Evidence for Centrifugal Instabilities","authors":"Jian-zhao Wang,&nbsp;Fran Bagenal,&nbsp;Robert J. Wilson,&nbsp;Peter A. Delamere,&nbsp;Robert W. Ebert,&nbsp;Philip W. Valek,&nbsp;Frederic Allegrini,&nbsp;Jamey R. Szalay","doi":"10.1029/2025JE009021","DOIUrl":null,"url":null,"abstract":"<p>In Jupiter's magnetosphere, plasma originating from Io's escaping atmosphere is radially transported outward via two modes of centrifugally driven dynamics. In flux tube interchange events from the Rayleigh–Taylor instability, the cold and dense flux tube moves outward, while hot and depleted flux tubes are injected inwards. In the ballooning mode of the firehose instability, the flux tube breaks off with bursts of plasma blobs. Both modes suggest outward transport of cold, dense plasma blobs. In this study, we survey the cold blobs, analyzing 147 events based on thermal plasma measurements from the Juno/JADE-I instrument. The cold blobs are identified by searching time-of-flight spectra for very narrow signatures in the energy distributions. Plasma parameters determined by forward modeling reveal two types of cold blob events. The first type of event, occurring outside 25 R<sub><i>J</i></sub>, exhibits high density and fast radial velocity accompanied by magnetic nulls and mainly occurs on the dawnside, suggesting an origin from the ballooning mode. The second type of event, occurring within 35 R<sub><i>J</i></sub>, shows simultaneous outward moving cold, dense plasma with inward moving hot, tenuous plasma with no dependence on local time, indicating flux tube interchange. Based on statistics between 15 R<sub><i>J</i></sub> and 30 R<sub><i>J</i></sub>, the mass transport rate of the cold blobs is estimated to be about 100 kg/s, which is insufficient to account for the plasma production rate at Io.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 7","pages":""},"PeriodicalIF":4.0000,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysical Research: Planets","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2025JE009021","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0

Abstract

In Jupiter's magnetosphere, plasma originating from Io's escaping atmosphere is radially transported outward via two modes of centrifugally driven dynamics. In flux tube interchange events from the Rayleigh–Taylor instability, the cold and dense flux tube moves outward, while hot and depleted flux tubes are injected inwards. In the ballooning mode of the firehose instability, the flux tube breaks off with bursts of plasma blobs. Both modes suggest outward transport of cold, dense plasma blobs. In this study, we survey the cold blobs, analyzing 147 events based on thermal plasma measurements from the Juno/JADE-I instrument. The cold blobs are identified by searching time-of-flight spectra for very narrow signatures in the energy distributions. Plasma parameters determined by forward modeling reveal two types of cold blob events. The first type of event, occurring outside 25 RJ, exhibits high density and fast radial velocity accompanied by magnetic nulls and mainly occurs on the dawnside, suggesting an origin from the ballooning mode. The second type of event, occurring within 35 RJ, shows simultaneous outward moving cold, dense plasma with inward moving hot, tenuous plasma with no dependence on local time, indicating flux tube interchange. Based on statistics between 15 RJ and 30 RJ, the mass transport rate of the cold blobs is estimated to be about 100 kg/s, which is insufficient to account for the plasma production rate at Io.

木星磁层中冷等离子体斑点的调查:离心不稳定性的证据
在木星的磁层中,来自木卫一逃逸大气层的等离子体通过两种离心驱动动力学模式向外径向传输。在瑞利-泰勒不稳定性引起的通量管交换事件中,冷的和密集的通量管向外移动,而热的和耗尽的通量管向内注入。在火龙不稳定的气球模式下,通量管随着等离子体斑点的爆发而断裂。这两种模式都表明冷而致密的等离子体团向外传输。在这项研究中,我们调查了冷团,分析了基于Juno/JADE-I仪器的热等离子体测量的147个事件。通过搜索飞行时间谱,在能量分布中寻找非常窄的特征来识别冷团。通过正演模拟确定的等离子体参数揭示了两种类型的冷团事件。第一种类型的事件发生在25rj之外,具有高密度和快速径向速度并伴有磁空,主要发生在黎明侧,表明起源于气球模式。第二种类型的事件发生在35rj范围内,显示出同时向外移动的冷而致密的等离子体和向内移动的热而稀薄的等离子体,不依赖于当地时间,表明通量管互换。根据15rj到30rj之间的统计数据,估计冷团的质量传输速率约为100kg /s,这不足以解释Io的等离子体产生速率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Journal of Geophysical Research: Planets
Journal of Geophysical Research: Planets Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
8.00
自引率
27.10%
发文量
254
期刊介绍: The Journal of Geophysical Research Planets is dedicated to the publication of new and original research in the broad field of planetary science. Manuscripts concerning planetary geology, geophysics, geochemistry, atmospheres, and dynamics are appropriate for the journal when they increase knowledge about the processes that affect Solar System objects. Manuscripts concerning other planetary systems, exoplanets or Earth are welcome when presented in a comparative planetology perspective. Studies in the field of astrobiology will be considered when they have immediate consequences for the interpretation of planetary data. JGR: Planets does not publish manuscripts that deal with future missions and instrumentation, nor those that are primarily of an engineering interest. Instrument, calibration or data processing papers may be appropriate for the journal, but only when accompanied by scientific analysis and interpretation that increases understanding of the studied object. A manuscript that describes a new method or technique would be acceptable for JGR: Planets if it contained new and relevant scientific results obtained using the method. Review articles are generally not appropriate for JGR: Planets, but they may be considered if they form an integral part of a special issue.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信