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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Io's equatorial spots: Morphology of neutral UV emissions
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Io's equatorial spots: Morphology of neutral UV emissions

机译：艾欧（Io）的赤道斑点：中性紫外线发射的形态

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The first observations of Io with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST) showed that the brightest ultraviolet emissions come from localized regions near Io's equator, designated "equatorial spots." This paper presents a detailed study of the location, shape, and brightness of the equatorial spots in near-monochromatic images obtained using STIS in the first-order long-slit spectroscopy mode. This study provides evidence that the equatorial emissions are linked to the interaction between the Jovian magnetosphere and Io's atmosphere. The morphology of the equatorial spots reported here provides additional information on the nature of this complex electrodynamic interaction. We find the following principal results: the locations of the equatorial spots are correlated with the Jovian magnetic field orientation at Io, but with a relation that is not 1:1; the equatorial spots are centered 10 degrees -30 degrees longitude downstream from Io's sub-Jovian longitude; the brightness of the emissions in this data set is correlated with Io's distance from the plasma torus centrifugal equator; and the anti-Jovian equatorial spots are similar to 20% brighter than the sub-Jovian equatorial spots. [References: 23]
机译：利用哈勃太空望远镜（HST）上的太空望远镜成像光谱仪（STIS）对艾奥进行的首次观察表明，最亮的紫外线发射来自艾奥赤道附近的局部区域，称为“赤道点”。本文对一阶长缝光谱模式下使用STIS获得的近单色图像中赤道斑点的位置，形状和亮度进行了详细研究。这项研究提供了证据，表明赤道辐射与木星磁层和艾奥大气之间的相互作用有关。这里报道的赤道的形态提供了有关这种复杂的电动相互作用的性质的其他信息。我们发现以下主要结果：赤道点的位置与Io处的Jovian磁场方向相关，但与非1：1关系;赤道点的中心位于艾奥亚-朱维安经度下游10度-30度。该数据集中的发射亮度与Io距等离子体圆环离心赤道的距离相关;而且反赤道赤道点的亮度比次赤道赤道的亮度高20％。 [参考：23]

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