Hourly Periodic Variations of Ultralow-Frequency (ULF) Waves in Jupiter's Magnetosheath

Gu, W. D.1,2; Yao, Z. H.1,2,3; Pan, D. X.4; Xu, Y.1,2; Zhang, B.5; Delamere, P. A.6; Fu, S. Y.7; Xie, L.7; Ye, S. Y.8; Chen, Y. N.8; Dunn, W. R.; Wei, Y.1,2

2023-02-01

10.1029/2022JE007625

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS   Impact Factor & Quartile

2169-9097

2169-9100

Periodic variations are widely identified in the Jovian system, varying from 10 s of seconds to several days or even longer. These processes are strongly influenced by solar wind conditions, planetary rotation and Io's volcanic activity. Ultralow-frequency (ULF) waves at 10 s of minutes, which are the typical time scale of field-line resonance, are considered as a crucial process in driving the Jovian energy circulation. The longer time-scale periodicities are likely associated with global mass circulation. In this study, we focus on multihour variations of the ULF wave energy, which are difficult to identify within the magnetosphere due to the rapid planetary rotation modulation. Using the magnetic field observations from Juno and Galileo in Jupiter's magnetosheath, we found multiple significant multihour periodicities, widely distributed from 2 to 10 hr, peaked at different values from case to case. The most common periodicities were between 3 and 5 hr, existing in both the dawn and dusk sides. These common periodicities are likely associated with the energy transport from the inside to the magnetosheath.Plain Language Summary Periodicities, as detected in aurora, particles, waves, etc., widely exist in the Jovian system. The periodic variations are key signatures to assess theoretical hypotheses, and the coherence between the periodicities in different types of observations can be a crucial constraint to reveal physical causality. Jupiter's magnetic axis is about 10 degrees offset from the rotation axis, resulting in a periodic vibration of the magnetosphere. A spacecraft traveling in Jupiter's magnetospheric space would persistently detect rapid variations of the magnetic field every several hours, and the variation feature depends on the relative location to the magnetic equator and the dynamic magnetospheric processes. Therefore, the investigation of hourly variation of the Jovian magnetosphere is highly challenging due to the strong mixture of spatial and temporal effects. To overcome this difficulty, we analyze magnetic field and plasma wave data in Jupiter's magnetosheath, where the planetary rotation induced spatial variations no longer exist. Many multihour periodicities are identified, which are believed to be consequences of compressions from the rotating magnetospheric plasma to the magnetopause.

Jupiter ULF waves magnetosheath periodicity

SCI

English

Others

Strategic Priority Research Program of Chinese Academy of Sciences[XDB 41000000] ; National Science Foundation of China[42074211] ; Key Research Program of the Institute of Geology Geophysics CAS[IGGCAS-201904] ; National Natural Science Foundation of China[42004149] ; STFC consolidated Grant[ST/S000240/1]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000936309100001

AMER GEOPHYSICAL UNION

SPACE SCIENCE

Web of Science

1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
3.Univ Coll London, Mullard Space Sci Lab, Dorking, England
4.China Univ Geosci Beijing, Sch Geophys & Informat Technol, Beijing, Peoples R China
5.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China
6.Univ Alaska Fairbanks, Geophys Inst, Fairbanks, AK USA
7.Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China
8.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China

Gu, W. D.,Yao, Z. H.,Pan, D. X.,et al. Hourly Periodic Variations of Ultralow-Frequency (ULF) Waves in Jupiter's Magnetosheath[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2023,128(2).

Gu, W. D..,Yao, Z. H..,Pan, D. X..,Xu, Y..,Zhang, B..,...&Wei, Y..(2023).Hourly Periodic Variations of Ultralow-Frequency (ULF) Waves in Jupiter's Magnetosheath.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,128(2).

Gu, W. D.,et al."Hourly Periodic Variations of Ultralow-Frequency (ULF) Waves in Jupiter's Magnetosheath".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 128.2(2023).