金星轨道外尘埃堆积的证据
Evidence for dust accumulation just outside the orbit of Venus
摘要：
为了有助于了解行星际尘埃的动力学，我们正在寻找金星轨道附近行星际尘埃的空间分布结构。为此，我们研究了1975年至1979年期间太阳神太空探测器上的黄道光光度计在多个轨道上观察到的黄道光亮度的径向梯度。最干净的数据来自1976年1月发射的Helios B（= Helios 2）。关于黄道带光线亮度对太阳的普遍增加，数据显示太阳神号空间探测器在金星轨道外的位置有百分之几的额外亮度。我们认为这是与金星轨道有关的尘埃环的证据，有点类似于早期在地球轨道上发现的尘埃环。
英文摘要：
To contribute to the knowledge of dynamics of interplanetary dust we are searching for structures in the spatial distribution of interplanetary dust near the orbit of Venus. To this end we study the radial gradient of zodiacal light brightness, as observed by the zodiacal light photometer on board the Helios space probes on several orbits from 1975 to 1979. The cleanest data result from Helios B (= Helios 2) launched in January 1976. With respect to the general increase of zodiacal light brightness towards the Sun, the data show an excess brightness of a few percent for positions of the Helios space probe just outside the orbit of Venus. We consider this as evidence for a dust ring associated with the orbit of Venus, somewhat similar to that found earlier along the Earth's orbit.
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