IO ON THE EVE OF THE GALILEO MISSION
IO ON THE EVE OF THE GALILEO MISSION
复制标题
伽利略任务前夕的 IO
DOI：
10.1146/annurev.earth.24.1.125
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发表时间：
1996
影响因子：
14.9
通讯作者：
N. Schneider
中科院分区：
文献类型：
--
作者：
J. Spencer;N. Schneider
木卫一是木星大卫星的最内侧，是太阳系中最不寻常的天体之一。 内部的潮汐加热产生的全球热通量是陆地值的40倍，产生强烈的火山活动和全球平均约1厘米/年的表面重塑率。火山可能主要喷发硅酸盐熔岩，但最上层的表面主要是硫化合物，包括SO2霜。火山和霜冻支撑着稀薄、不均匀的SO2大气，峰值压力接近10−8巴。木星磁层中的等离子体对表面和大气的持续轰击导致了木卫一物质（主要是硫、氧和钠原子、离子和分子）以约103 kg s−1的速率逃逸。由此产生的环绕木星的电离硫和氧环主导着木星的磁层，与一个扩展的中性钠云一起，很容易从地球上观察到。
▪ Abstract Io, innermost of Jupiter's large moons, is one of the most unusual objects in the Solar System. Tidal heating of the interior produces a global heat flux 40 times the terrestrial value, producing intense volcanic activity and a global resurfacing rate averaging perhaps 1 cm yr−1. The volcanoes may erupt mostly silicate lavas, but the uppermost surface is dominated by sulfur compounds including SO2 frost. The volcanoes and frost support a thin, patchy SO2 atmosphere with peak pressure near 10−8 bars. Self-sustaining bombardment of the surface and atmosphere by Io-derived plasma trapped in Jupiter's magnetosphere causes escape of material from Io (predominantly sulfur, oxygen, and sodium atoms, ions, and molecules) at a rate of about 103 kg s−1. The resulting Jupiter-encircling torus of ionized sulfur and oxygen dominates the Jovian magnetosphere and, together with an extended cloud of neutral sodium, is readily observable from Earth.