Rotating Finger‐Like Structures of Jovian Magnetodisc

Abstract At Jupiter, the plasma is concentrated near the centrifugal equator, forming a magnetodisc. The planet's dipole tilt induces periodic disc flapping, generating magnetic oscillations observed by spacecraft. While centrifugal forces are theorized to drive interchange instability in this system, direct detection of such structures remains challenging due to flapping‐induced variabilities. However, in situ and remote sensing data reveal ∼tens‐of‐minute periodicities proposed to link to interchange dynamics. Using unique Juno observations, we analyze two events to: (a) resolve highly variable magnetic curvature changes during successive plasma sheet crossings and (b) identify periodic ∼30‐min fluctuations in plasma measurements in the magnetodisc while Juno occupied a magnetically favorable location. These findings provide the first direct examination of interchange‐related magnetic curvature evolution and plasma signatures, to advance our understanding of the magnetodisc's 3D structure and instability‐driven dynamics.

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Publication Details

Journal
Geophysical Research Letters
Published
2025-08-04
DOI
https://doi.org/10.1029/2025gl116277
Citations
1
Primary Topic
Astro and Planetary Science
Type
article
Field-Weighted Citation Impact
1.15
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article

Rotating Finger‐Like Structures of Jovian Magnetodisc

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Rotating Finger‐Like Structures of Jovian Magnetodisc

Jiabao Sun, F. Allegrini, Y. N. Chen, Binzheng Zhang, J. E. P. Connerney, R. W. Ebert, Bertrand Bonfond, Y. B. Xu, W. R. Dunn, Denis Grodent, Zhonghua Yao, Z.K. Zeng
article en
1 citations

Abstract

Abstract At Jupiter, the plasma is concentrated near the centrifugal equator, forming a magnetodisc. The planet's dipole tilt induces periodic disc flapping, generating magnetic oscillations observed by spacecraft. While centrifugal forces are theorized to drive interchange instability in this system, direct detection of such structures remains challenging due to flapping‐induced variabilities. However, in situ and remote sensing data reveal ∼tens‐of‐minute periodicities proposed to link to interchange dynamics. Using unique Juno observations, we analyze two events to: (a) resolve highly variable magnetic curvature changes during successive plasma sheet crossings and (b) identify periodic ∼30‐min fluctuations in plasma measurements in the magnetodisc while Juno occupied a magnetically favorable location. These findings provide the first direct examination of interchange‐related magnetic curvature evolution and plasma signatures, to advance our understanding of the magnetodisc's 3D structure and instability‐driven dynamics.

Geophysical Research LettersVol. 52(15)
Southwest Research Institute (US), Planetary Science Institute (US), Goddard Space Flight Center (US), University of Liège (BE), Peking University (CN), Southern University of Science and Technology (CN), University College London (GB), The University of Texas at San Antonio (US), University of Hong Kong (HK)
Openalex Percentile: Top 17%
Astro and Planetary Science
1.15
DOIOpen Access PDFOpenAlex
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