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Updated: Jan 11, 2026
06:42
Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
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Pressure anisotropy-driven instabilities regulate the jovian magnetodisk
Z-Y Liu1, N André2,3, M Blanc2,4
1Institut de Recherche en Astrophysique et Planétologie (IRAP), CNES-CNRS-Université Toulouse III Paul Sabatier, Toulouse, France. zhi-yang.liu@irap.omp.eu.
Nature Communications
|November 13, 2025
Summary
Plasma pressure anisotropy-driven instabilities, like the firehose instability, control Jupiter's magnetodisk dynamics. These instabilities help dissipate energy after disturbances, explaining the magnetodisk's non-equilibrium evolution.
Area of Science:
- Space Physics
- Plasma Physics
- Planetary Science
Background:
- Jupiter's magnetosphere, a model for fast rotators, features a unique magnetodisk.
- The stability and dynamics of this magnetodisk are not fully understood.
- Existing models do not fully capture the complex processes within the magnetodisk.
Purpose of the Study:
- To investigate the role of plasma pressure anisotropy-driven instabilities in Jupiter's magnetodisk.
- To understand the stability and non-equilibrium dynamics of the Jovian magnetodisk.
- To identify key mechanisms governing energy dissipation in the magnetodisk.
Main Methods:
- Analysis of observational data from the Juno mission.
- Theoretical analysis of plasma instabilities.
- Detailed examination of firehose instability's role during magnetic dipolarizations.
Main Results:
- Observational evidence confirms the role of mirror, cyclotron, and firehose instabilities.
- These instabilities drive the magnetodisk plasma towards marginal equilibrium states post-disturbance.
- Firehose instability is identified as a key energy dissipation mechanism during magnetic dipolarizations.
Conclusions:
- Pressure anisotropy-driven instabilities are crucial for the non-equilibrium evolution of Jupiter's magnetodisk.
- These instabilities govern the response of the magnetodisk to disturbances.
- The findings provide new insights into the physics of Jupiter's magnetodisk and magnetosphere.
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