Measurements of the skylight scattering function

Near-Sun Readings at λ 0.93 μm

(a) Without a U-shield, (b) with a U-shield, and (c) shaded by a distant edge. Measured values (not corrected for field-of-view averaging) for a relatively steep phase function. Relative deviations (bold numbers) of result in normal condition (b) from those in ideal condition (c) are much smaller at λ 0.5 μm.

Aerosol Transmittance T_u at Unit Air Mass for Some Values of Aerosol Optical Depth τ_A at λ 868 nm

Water Vapor Transmittance T_w in the U-Channel for Different Values of Zenith Precipitable Water and Air Mass

Key to Figs. 11 and 12; Data of First Two Days are not Included in Fig. 11

Table I

Near-Sun Readings at λ 0.93 μm

(a) Without a U-shield, (b) with a U-shield, and (c) shaded by a distant edge. Measured values (not corrected for field-of-view averaging) for a relatively steep phase function. Relative deviations (bold numbers) of result in normal condition (b) from those in ideal condition (c) are much smaller at λ 0.5 μm.

Table II

Aerosol Transmittance T_u at Unit Air Mass for Some Values of Aerosol Optical Depth τ_A at λ 868 nm

Table III

Water Vapor Transmittance T_w in the U-Channel for Different Values of Zenith Precipitable Water and Air Mass

Table IV

Key to Figs. 11 and 12; Data of First Two Days are not Included in Fig. 11