Hall W N
Appl Opt. 1971 Jun 1;10(6):1225-31. doi: 10.1364/AO.10.001225.
The relative spectral intensity of the zenith sky was measured with an optical scanning spectrometer at Nantucket Island, Massachusetts, during the total solar eclipse of 7 March 1970. The spectral ratios I(5100 A)/I(4300 A) and I(5900 A)/I(5100 A) at Nantucket remained unchanged for 96% or less obscuration of the sun by the moon. The results are compared with other recent relative spectral intensity measurements made during total solar eclipses. Comparison with other eclipse measurements for solar elevation angle at totality less than 45 degrees shows a blue color shift consistent with rayleigh scattering. Eclipses with solar elevation angles at totality greater than 45 degrees do not show consistent color shifts. This inconsistency may be due to difficulty in establishing a suitable reference spectrum for comparison with the spectral distribution of the zenith sky at totality. Selection of a suitable reference spectrum is discussed.
1970年3月7日发生日全食期间，在马萨诸塞州楠塔基特岛用光学扫描光谱仪测量了天顶天空的相对光谱强度。在楠塔基特岛，当月球遮挡太阳96%或更低时，光谱比I(5100埃)/I(4300埃)和I(5900埃)/I(5100埃)保持不变。将结果与近期日全食期间进行的其他相对光谱强度测量进行了比较。与日全食时太阳仰角小于45度的其他日食测量结果相比，显示出与瑞利散射一致的蓝移。日全食时太阳仰角大于45度的日食没有显示出一致的颜色变化。这种不一致可能是由于难以建立一个合适的参考光谱来与日全食时天顶天空的光谱分布进行比较。讨论了合适参考光谱的选择。
