Energetic Plasma Injections in Jovian Inner Magnetosphere: A Simulation Study

Wang, Yuxian1,2,3; Yang, Jian4; Guo, Xiaocheng1,2,3; Blanc, Michel5,6; Wang, Chi1,2,3

2024-02-01

10.1029/2023JE008178

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS   影响因子和分区

2169-9097

2169-9100

["Outward transport of cold iogenic plasma and energetic charged particle injections are two essential aspects of mass, energy and magnetic flux circulation in the Jovian magnetosphere. However, it is unclear how these two processes interplay and how they evolve globally in the Jovian inner magnetosphere. We use the improved Rice Convection Model-Jupiter to simulate the concurrent energetic injection and cold plasma convection in Jupiter's inner magnetosphere. The effects of plasma density, injection site location and energy of energetic particles on the plasma injection are parametrically investigated through a series of runs. The model successfully reproduces the energy-time dispersion signature of energetic particles that may be observed by a spacecraft during an injection event. Simulation results show that the energetic injection is mainly driven by the electric field associated with the cold plasma outflow. Energetic particles are transported inward in the form of elongated fingers which appear interlaced with those of cold iogenic plasma. The injected particles are strongly modulated by the gradient/curvature drift, especially in inner regions close to the planet, and show a significant dispersion feature during the evolution. The radial velocity of the injection decreases from over 100 km/s at L = 20 RJ to less than 10 km/s at L = 10 RJ, while the related field-aligned currents tend to increase during the inward injection. The energetic plasma density and the injection site location are found to have little effect on the plasma injection, provided that their effect on cold plasma convection is negligible.","The injection of hot plasma from the outside to the inside of the magnetosphere is commonly observed in planetary magnetospheres. At Jupiter, cold plasma originating from Jupiter's Galilean moon Io is transported outward throughout the magnetosphere via the interchange instability, which is essentially similar to the so-called Rayleigh-Taylor instability in hydrodynamics. In the meantime, distant flux tubes are supposed to move inward to balance the outflowing cold and dense plasma as a result of conservation of magnetic flux. The hot and tenuous particles embedded in distant flux tubes can thus be injected inward. In this article, we improve our previous Rice Convection Model-Jupiter by including energetic plasma and use it to study both the hot plasma injection and cold plasma convection in the Jovian inner magnetosphere. Our improved model is capable of reproducing injection signatures that align with observations. We found that the outflowing cold plasma from Io plays a crucial role in the injection of hot plasma.","We simulate the concurrent energetic injection and cold iogenic plasma convection using an improved Jovian inner magnetosphere model We reproduce the energy-time dispersion signature of energetic particles during an injection event by full simulations for the first time The energetic injection is found to be significantly affected by the outflowing cold plasma convection"]

Jupiter inner magnetosphere simulation injection interchange instability

SCI

英语

其他

NNSFC["42304189","42150105","41874171"] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB 41000000] ; Key Research Program of the Chinese Academy of Sciences[ZDRE-KT-2021-3] ; null[2021YFA0718600]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001169630200001

AMER GEOPHYSICAL UNION

SPACE SCIENCE

Web of Science

1.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
2.Chinese Acad Sci, Natl Space Sci Ctr, Key Lab Solar Act & Space Weather, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
4.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
5.Univ Toulouse III, Inst Rech Astrophys & Planetol, CNRS, CNES, Toulouse, France
6.Aix Marseille Univ, Lab Astrophys Marseille, CNRS, Toulouse, France

Wang, Yuxian,Yang, Jian,Guo, Xiaocheng,et al. Energetic Plasma Injections in Jovian Inner Magnetosphere: A Simulation Study[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2024,129(2).

Wang, Yuxian,Yang, Jian,Guo, Xiaocheng,Blanc, Michel,&Wang, Chi.(2024).Energetic Plasma Injections in Jovian Inner Magnetosphere: A Simulation Study.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,129(2).

Wang, Yuxian,et al."Energetic Plasma Injections in Jovian Inner Magnetosphere: A Simulation Study".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 129.2(2024).