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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Secular and local time dependence of Jovian X ray emissions
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Secular and local time dependence of Jovian X ray emissions

机译：木星X射线发射的长期和当地时间依赖性

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Jovian soft X rays are believed to be line emissions from energetic oxygen and sulfur ions generated through charge exchange and stripping reactions when the ions enter Jupiter's upper atmosphere. The X rays are brightest in the polar regions (generally about twice as bright in the north as in the south) but also have a large component from low latitudes. Observations of Jupiter's X ray emissions at several epochs by the high-resolution imager (HRI) instrument on the ROSAT satellite show a general decrease in overall brightness by similar to 50% from 1994 to 1996 and reveal an interesting dependence of brightness on local time. The emissions are not of uniform brightness across the disk but are strongly weighted toward one Limb of the planet. The X ray limb can be on either the duskside or dawnside of Jupiter, and so far it correlates with position of the subsolar point relative to the sub-Earth point (i.e., the X ray limb is the bright visible limb). Except during the Shoemaker-Levy 9 impacts, the total X ray emissions are not strongly correlated with System III central meridian longitude. However, a composite map of the emissions shows that they are generally located in regions of low surface magnetic field strength at low latitudes, and in regions of large horizontal surface magnetic field strength gradients at high latitudes. [References: 9]
机译：据信木星的X射线是离子进入木星的高层大气时通过电荷交换和汽提反应产生的高能氧和硫离子的线发射。 X射线在极地地区最亮（通常是北部的两倍，是南部的两倍），但在低纬度地区也有很大的分量。用高分辨率成像仪（HRI）在ROSAT卫星上观测到的木星X射线发射在几个时间段上显示，从1994年到1996年，总体亮度总体下降了约50％，并且揭示了亮度对当地时间的有趣依赖性。辐射在整个磁盘上的亮度不是均匀的，而是朝着地球的一个肢体强烈地加权。 X射线肢体可以在木星的黄昏或黎明侧，到目前为止，它与太阳下点相对于地下地球点的位置相关（即，X射线肢体是明亮的可见肢体）。除了在Shoemaker-Levy 9碰撞期间，总的X射线发射与System III中央子午线经度没有强相关。但是，发射的合成图表明，它们通常位于低纬度的低表面磁场强度区域和高纬度的大水平表面磁场强度梯度区域中。 [参考：9]

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