I0-Jupiter系统：月球-行星相互作用的一个独特案例
I0-Jupiter system: A unique case of Moon-Planet interaction
摘要：
木卫一和木星构成了一个卫星行星系统，这在我们的太阳系中是独一无二的。木卫一是火山活动最活跃的行星体，而木星在大小、质量、磁场强度、自旋速率和磁层体积方面都是行星中的第一位。木卫一与木星的电动联系在近四十年前就从无线电发射中得知。木卫一通过向木星的磁层提供重离子来影响木星，磁层控制着木星的能量和动力学。木星通过潮汐加热其内部来影响木卫一，这反过来又驱动了木卫一上的火山活动。木卫一和木星在它们相互作用中的作用以及它们耦合的性质在1979年的两次旅行者号飞越中首次得到了更详细的阐述。随后，地面和地球卫星上的观测站以及伽利略轨道飞行器对这个系统进行了探索，使我们对木卫一和木星之间高度复杂的电动相互作用的理解提高了许多倍。在木星大气层中发现了这种相互作用的一个明显特征，即木卫一通量管（IFT）底部的类似极光的明亮发射点以及红外（IR）、紫外（UV）和可见光波长的类似彗星的尾巴。HST、伽利略和卡西尼号的成像实验已经观测到了来自木卫一大气层的紫外和可见光波长的辐射，这些辐射可能是由IFT中的高能电子产生的。本文综述了木卫一-木星系统的这些方面，凭借其电动力学耦合，太阳系外的行星系统和双星的启示。
英文摘要：
Io and Jupiter constitute a moon-planet system that is unique in our solar system. Io is the most volcanically active planetary body, while Jupiter is the first among the planets in terms of size, mass, magnetic field strength, spin rate, and volume of the magnetosphere. That Io is electrodynamically linked to Jupiter is known for nearly four decades from the radio emissions. Io influences Jupiter by supplying heavy ions to its magnetosphere, which dominates its energetic and dynamics. Jupiter influences Io by tidally heating its interior, which in turn drives the volcanic activity on Io. The role of Io and Jupiter in their mutual interaction and the nature of their coupling were first elaborated in greater detail by the two Voyagers flybys in 1979. Subsequent exploration of this system by ground-based and Earth-satellite-borne observatories and by the Galileo orbiter mission has improved our understanding of the highly complex electrodynamical interaction between Io and Jupiter many fold. A distinct feature of this interaction has been discovered in Jupiter's atmosphere as a auroral-like bright emission spot along with a comet-like tail in infrared (IR), ultraviolet (UV), and visible wavelengths at the foot of Io flux tube (IFT). The HST and Galileo and Cassini imagining experiments have observed emissions from the Io's atmosphere at UV and visible wavelengths, which could be produced by energetic electrons in IFT. In this paper an overview on these aspects of the Io-Jupiter system is presented, which by virtue of its electrodynamical coupling, has implications for the extra-solar planetary system and binary stars.
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