Fig. 2. The polarization light field near midday; data were obtained between 12:16 and 13:22h Eastern Daylight Time on 16 August 1999. Each panel shows the spectra of radiance, degree of polarization and e-vector angle at one orientation of the polarimeter, indicated by the compass directions at the top and elevations (0–90°) in the panels on the left. Blue lines, radiance (all curves are scaled such that 1.0 on the left-hand ordinate is equivalent to 2.92x10¹²photonscm^-2sterad^-1nm^-1s^-1); black lines, e-vector angle (0° is horizontal, with angles increasing counterclockwise; right-hand ordinate); green lines, degree of polarization (left-hand ordinate). Note that data for South are plotted twice, at each end of each row, to provide continuity.