标题： 尘埃作为木星上斑点的成因 显示英文标题

标题： Dust as the cause of spots on Jupiter

摘要： 由苏梅克-列维9号彗星（Comet S-L 9）碎片撞击木星引发的长寿斑点可以通过撞击产生的尘埃云来解释。这些尘埃云位于平流层，它们吸收了通常会从下方云层反射的可见光，并反射出通常会被大气甲烷吸收的红外辐射。我们在此表明，只要碎片核主要由硅酸盐组成且直径大于约0.4公里，则从碎片进入点喷出的由彗星和木星物质组成的高温气体中，会凝结出所需的尘埃量，这些尘埃将在平流层中长时间悬浮。半径约为1$\;\mu$米的颗粒可以解释这些斑点的光学特性和寿命。根据我们的模型，在这些斑点的$10 - \mu$米光谱中应存在一个硅酸盐带。 显示英文摘要

摘要： The long-lived spots caused by the impact of fragments of Comet S-L 9 on Jupiter can be understood if clouds of dust are produced by the impact. These clouds reside in the stratosphere, where they absorb visible light that would ordinarily reflect from the cloud deck below, and reflect radiation at infrared wavelengths that would ordinarily be absorbed by atmospheric methane. Here we show that, provided that the nucleus of a fragment is composed substantially of silicates and has a diameter greater than about 0.4 km, dust in the required amounts will condense from the hot gas composed of cometary and Jovian material ejected from the site where the fragment entered, and the dust will be suspended in the stratosphere for long periods. Particles about 1$\;\mu$m in radius can explain both the optical properties and longevities of the spots. According to our model, a silicate band should be present in the $10 - \mu$m spectra of the spots.