Abstract
Previous measurements of the filling-in of Fraunhofer lines in the spectrum of the daytime sky or Ring effect have suggested that this added component to the general Rayleigh scattered light is unpolarized. There is a consensus in the literature that this is the case. However, measurements of the Hβ line from the zenith sky are reported here which reveal that the Ring component is substantially polarized (~ 25%) particularly at some times of the day. The degree of polarization at these times is substantially higher than is predicted by rotational Raman scattering from air molecules, this mechanism being favoured as the origin of the Ring intensity. These results suggest that some alternative or additional mechanism for producing the line filling-in effect needs to be invoked.
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