Force‐Free Current Sheets in the Jovian Magnetodisk: The Key Role of Electron Field‐Aligned Anisotropy.
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| Title: | Force‐Free Current Sheets in the Jovian Magnetodisk: The Key Role of Electron Field‐Aligned Anisotropy. |
|---|---|
| Authors: | Artemyev, A. V.1 (AUTHOR) aartemyev@igpp.ucla.edu, Ma, Q.2,3 (AUTHOR), Ebert, R. W.4,5 (AUTHOR), Zhang, X.‐J.1,6 (AUTHOR), Allegrini, F.4,5 (AUTHOR) |
| Source: | Journal of Geophysical Research. Space Physics. Mar2023, Vol. 128 Issue 3, p1-13. 13p. |
| Subject Terms: | Current sheets, Magnetic field measurements, Electron configuration, Thermal electrons, Thermal instability, Anisotropy |
| Abstract: | Current sheets are an essential element of the planetary magnetotails, where strong plasma currents self‐consistently support magnetic field gradients. The current sheet configuration is determined by plasma populations that contribute to the current density. The most commonly investigated configuration is supported by diamagnetic cross‐field currents of hot ions, typical for the magnetospheres of magnetized planets. In this study, we examine a new type of the current sheet configuration supported by field‐aligned currents from electron streams in the Jovian magnetodisk. Such bi‐directional streams increase the electron thermal anisotropy close to the fire‐hose instability threshold and lead to strong magnetic field shear. The current sheet configuration supported by electron streams is nearly force‐free, with |B| ≈ const across the sheet. Using Juno plasma and magnetic field measurements, we investigate the internal structure of such current sheets and discuss possible mechanisms for their formation. Key Points: We report Juno observations of thin anisotropic current sheets in the Jovian magnetodiskThe contribution of electron streams to the current sheet stress balance is estimatedWe show force‐free current sheet configuration supported by strong electron field‐aligned currents [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | GreenFILE |
| FullText | Text: Availability: 0 |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 162730197 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Force‐Free Current Sheets in the Jovian Magnetodisk: The Key Role of Electron Field‐Aligned Anisotropy. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Artemyev%2C+A%2E+V%2E%22">Artemyev, A. V.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> aartemyev@igpp.ucla.edu</i><br /><searchLink fieldCode="AR" term="%22Ma%2C+Q%2E%22">Ma, Q.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ebert%2C+R%2E+W%2E%22">Ebert, R. W.</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+X%2E‐J%2E%22">Zhang, X.‐J.</searchLink><relatesTo>1,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Allegrini%2C+F%2E%22">Allegrini, F.</searchLink><relatesTo>4,5</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Mar2023, Vol. 128 Issue 3, p1-13. 13p. – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Current+sheets%22">Current sheets</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+field+measurements%22">Magnetic field measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+configuration%22">Electron configuration</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+electrons%22">Thermal electrons</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+instability%22">Thermal instability</searchLink><br /><searchLink fieldCode="DE" term="%22Anisotropy%22">Anisotropy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Current sheets are an essential element of the planetary magnetotails, where strong plasma currents self‐consistently support magnetic field gradients. The current sheet configuration is determined by plasma populations that contribute to the current density. The most commonly investigated configuration is supported by diamagnetic cross‐field currents of hot ions, typical for the magnetospheres of magnetized planets. In this study, we examine a new type of the current sheet configuration supported by field‐aligned currents from electron streams in the Jovian magnetodisk. Such bi‐directional streams increase the electron thermal anisotropy close to the fire‐hose instability threshold and lead to strong magnetic field shear. The current sheet configuration supported by electron streams is nearly force‐free, with |B| ≈ const across the sheet. Using Juno plasma and magnetic field measurements, we investigate the internal structure of such current sheets and discuss possible mechanisms for their formation. Key Points: We report Juno observations of thin anisotropic current sheets in the Jovian magnetodiskThe contribution of electron streams to the current sheet stress balance is estimatedWe show force‐free current sheet configuration supported by strong electron field‐aligned currents [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1029/2022JA031280 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 1 Subjects: – SubjectFull: Current sheets Type: general – SubjectFull: Magnetic field measurements Type: general – SubjectFull: Electron configuration Type: general – SubjectFull: Thermal electrons Type: general – SubjectFull: Thermal instability Type: general – SubjectFull: Anisotropy Type: general Titles: – TitleFull: Force‐Free Current Sheets in the Jovian Magnetodisk: The Key Role of Electron Field‐Aligned Anisotropy. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Artemyev, A. V. – PersonEntity: Name: NameFull: Ma, Q. – PersonEntity: Name: NameFull: Ebert, R. W. – PersonEntity: Name: NameFull: Zhang, X.‐J. – PersonEntity: Name: NameFull: Allegrini, F. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 21699380 Numbering: – Type: volume Value: 128 – Type: issue Value: 3 Titles: – TitleFull: Journal of Geophysical Research. Space Physics Type: main |
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