近日，中国科学院地质与地球物理研究所魏勇团队报道了基于伽利略磁场数据的木星内磁层多小时周期观测。该研究于2026年9月1日发表在《中国科学：地球科学》杂志上。

周期性是自然现象的基本特征。木星系统中从分钟到日尺度的周期性活动深刻影响着磁层演化。

针对木星磁层中的数小时周期信号，研究组分析了伽利略探测器多次赤道轨道近木点附近（径向距离<8 RJ）的磁场数据。结果表明，内磁层磁场的数小时周期特征以6–7小时周期信号为主，这些信号与木卫一磁纬度约13小时周期变化的谐波一致，可能源于木卫一（及其中性云）与木星磁层的相互作用。

同时，在木卫一轨道外侧探测到一个5小时周期信号，可能由电流片摆动产生。这两种周期性信号也可能向外传播至外磁层甚至磁鞘，因为在这些区域也观测到了它们，这表明它们可能是木星磁层中的全球性特征。

附：英文原文

Title: Observations of multi-hour periodicities in Jupiter’s inner magnetosphere based on Galileo magnetic field data

Author: anonymous

Issue&Volume: 2026-09-01

Abstract: Periodicity is a basic characteristic of natural phenomena. Periodic activities from minute to daily scale in the Jovian system profoundly affect magnetospheric evolution. Aiming at the multi-hour periodic signals in Jupiter’s magnetosphere, this study analyzes magnetic field data near the perijoves (radial distance <8RJ) of Galileo’s multiple equatorial orbits. The results indicate that the multi-hour periodic characteristics of the inner magnetospheric magnetic field are dominated by 6–7h periodic signals, which are consistent with the harmonics of the ~13h periodic variation of Io’s magnetic latitude and may originate from the interaction between Io (and its neutral cloud) and the Jovian magnetosphere. Meanwhile, a 5h periodic signal, possibly generated by current sheet flapping, is detected outside Io’s orbit. Both periodicities may propagate outward to the outer magnetosphere and even magnetosheath as they are also observed in these regions, suggesting that they may be global features in Jupiter’s magnetosphere.

DOI: 10.1007/s11430-026-1946-5

Source: https://www.sciengine.com/SCES/doi/10.1007/s11430-026-1946-5