XVII. On the vibrations of an atmosphere
XVII. On the vibrations of an atmosphere
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十七．
DOI：
10.1080/14786449008619921
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发表时间：
1890
期刊：
影响因子：
--
通讯作者：
R. Sec.
中科院分区：
文献类型：
--
作者：
R. Sec.
如果衍射粒子是非常薄的圆盘，其平面水平漂浮，那么只有当太阳位于天顶时，环才会是圆形的。当太阳高度为 30 时，环的垂直角直径大约是水平角直径的两倍。/~观察到类似的情况，因此我们必须假设粒子要么接近球形，要么其平面在所有位置上都是随机的。日落时观察到环有小幅扩张，特别是垂直半径，在距太阳 85 和 90 的天顶距离处分别达到 3 和 6；但很难想象颗粒的任何形状或方向可以解释这一点。随着太阳落下，空气的较高区域变得相对更亮，因此，如果这些区域包含较小的颗粒，则环的半径将会增加。另一方面，随着红色光线变得相对更强，红色环将变得更亮并向太阳扩展。这似乎与观察到的情况一致。布尔酒店, 达沃斯,
If the diffracting particles had been very thin circular disks floating with their planes horizontal, the ring wotrld only have been circular when the sun was in the zenith. When the sun was at an altitude of 30, the vertical angular diameter of the ring would have been about twice as great as the horizontal./~ othing like this was observed, so we must suppose the particles to have been either nearly spherical or else lying with their planes in all positions at random. A small dilatation of the ring was observed about sunset, especially of the vertical radius, amounting to 3 and 6 at zenith distances of the sun 85 and 90; but it is difficult to conceive any shape or orientation of the particles which would explain this.As the sun gets low the higher regions of the air become relatively brighter, so that if these contain smaller particles the radius of the ring will increase. On the other hand, as the red rays become relatively more powerful, the red ring will become brighter and broaden out towards the sun. This seems to agree with what was observed. Hotel Buol, Davos,