巴伐利亚上空的冰晕
(原标题: Ice Halos over Bavaria)
2023-12-20
浏览次数: 45
是什么导致了这些不寻常的天空弧线？冰晶。本月早些时候，当摄影师穿过德国巴伐利亚州菲森附近的一片新雪原时，他注意到自己进入了一团冰雾。要使悬浮的水凝结成冰雾，需要相当冷的温度，事实上，这一天的气温测得远低于零度。冰雾反射了太阳落在圣科尔曼教堂后面的光线。结果是摄影师所见过的最壮观的景象之一。首先，特色图片中的斑点不是背景星星，而是悬浮的冰雪。接下来，可以看到两个突出的冰晕：22度光晕和46度光晕。多重弧线也可见，包括，从上到下，反太阳（次太阳），环天顶，Parry，切线和parhelic（水平）。最后，连接顶部圆弧和太阳的气球形曲线是最罕见的：它是由悬挂在水平方向的六角形冰晶侧面反射形成的螺旋弧。
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What's causing those unusual sky arcs? Ice crystals. While crossing a field of fresh snow near Füssen, Bavaria, Germany, earlier this month, the photographer noticed that he had entered an ice fog. For suspended water to freeze into an ice fog requires quite cold temperatures, and indeed the air temperature on this day was measured at well below zero. The ice fog reflected light from the Sun setting behind St. Coleman Church. The result was one of the greatest spectacles the photographer has ever seen. First, the spots in the featured picture are not background stars but suspended ice and snow. Next, two prominent ice halos are visible: the 22-degree halo and the 46-degree halo. Multiple arcs are also visible, including, from top to bottom, antisolar (subsun), circumzenithal, Parry, tangent, and parhelic (horizontal). Finally, the balloon shaped curve connecting the top arc to the Sun is the rarest of all: it is the heliac arc, created by reflection from the sides of hexagonally shaped ice crystals suspended in a horizontal orientation.
© Bastian Werner