dayglown.

1853 T. O. Buckley Great Cities of Middle Ages 382 But to understand the Alhambra, it must be lived in, and beheld in the semi-obscure evening..when ravages are less apparent than when flouted by the gay day-glow.

1884 Current 3 Dec. 380/1 Tired of the sunshine and the glaring day-glow.

1905 Country Life 5th Aug. 174/2 The further north..the more magical the slow, gradual recession of the day-glow from vast luminous skies.

1916 Paint, Oil & Drug Rev. 12 July 33/3 The electric lighting is so arranged that with the use of modern lights there is but little change between the day glow and the night glow.

1979 T. Lee Quest for White Witch viii. 99 Dayglow suggested itself on the slope of the wall.

2008 B. S. Wheeler Mr. Hancock's Signature xxxi. 297 A light blue pallor hovered above the cutting stream..creating a soft day-glow that flitted against the water-tops.

1951 Rep. Progr. Physics 14 121 This term [sc. airglow] does not distinguish between the several distinct types of airglow. The author has therefore added the specific terms ‘night glow’ and ‘twilight glow’. Current work with rockets may, in fact, make the term ‘day glow’ as common as ‘night glow’.

1974 New Scientist 17 Jan. 126/1 Since the helium dayglow was 10 rayleighs and the hydrogen about 1000 rayleighs, this suggests that there is only a small amount of the former substance present [in the atmosphere of Jupiter].

1990 Sci. News 20 Oct. 248/2 Dayglow..contributed to his difficulty in finding the auras.

2010 M. Vázquez et al. Earth as Distant Planet iv. 169 Dayglow is produced when the atmosphere is illuminated by the sun. The main processes involved are resonance scattering and fluorescence.