| 释义 |
nightglow Meteorol.|ˈnaɪtgləʊ|
[f. night n. + glow n.]
The faint light emitted by the upper atmosphere at night.
1951Roach & Pettit in Jrnl. Geophysical Res. LVI. 325 Many investigators..have reported that the intensity of the green nightglow line at 5577 Å has a maximum near the observer's local midnight. Ibid., The general term ‘airglow’ is used for radiations originating in the upper atmosphere. We use the term ‘nightglow’ to connote airglow at night to distinguish it from similar radiations which may be present (though not observable) in the daytime. 1955Sci. Amer. Sept. 150/2 These studies show that the nightglow is faintest at the zenith overhead and grows in intensity down the sky until it reaches a maximum about 10 degrees above the horizon. 1967R. W. Fairbridge Encycl. Atmospheric Sci. & Astrogeol. 9/1 It has become usual to distinguish these differing kinds of airglow by the names ‘twilight glow’ and ‘dayglow’, in distinction to the ‘nightglow’. 1972Sci. Amer. Jan. 78/2 The nightglow can be observed with a photometer or a spectrometer. |