太阳晕在北纬63度
(原标题: Sun Halo at Sixty-three Degrees North)
2022-12-21
浏览次数: 16
冬至快乐!今天是12月至日，标志着南半球夏季和北半球冬季的天文开始。在每年一次穿越地球天空的长途跋涉中，在这个至日，太阳在21:48 UTC到达最南端的赤纬，南纬23.5度。大约4天前，太阳接近这个季节的南缘，所以在瑞典中部的奥斯特松德当地中午的时候，太阳刚刚在地平线之上。这张从遥远的北部湖滨城市俯瞰的照片中，正午的太阳带着美丽的太阳冰晕。自然产生的大气冰晶可以产生诱人的光晕，通过它们的六边形几何结构折射和反射阳光。尽管如此，由于太阳很低，在晴朗的天空中接近地平线，产生这种强烈光环的冰晶的可能来源是雪炮。在当地的一个滑雪场，造雪机在附近的Froson岛的顶部向全景的右侧制造了一个可见的羽流。
查看原文解释
Happy Solstice! Today is the December solstice, marking an astronomical beginning of summer in the southern hemisphere and winter in the north. On its yearly trek through planet Earth's skies, at this solstice the Sun reaches its southern most declination, 23.5 degrees south, at 21:48 UTC. About 4 days ago the Sun was near this seasonal southern limit and so only just above the horizon at local noon from Ostersund in central Sweden. This view looking over the far northern lakeside city finds the midday Sun with a beautiful solar ice halo. Naturally occurring atmospheric ice crystals can produce the tantalizing halo displays, refracting and reflecting the sunlight through their hexagonal geometry. Still, with the Sun low and near the horizon in the clear sky, likely sources of the ice crystals producing this intense halo are snow cannons. Operating at a local ski area, the snowmaking machines create a visible plume at the top of the nearby island Froson toward the right side of the panorama.
© Goran Strand