Horizon Brightness Revisited: Measurements and a Model of Clear-Sky Radiances
NAVAL ACADEMY ANNAPOLIS MD
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Clear daytime skies persistently display a subtle local maximum of radiance near the astronomical horizon. Spectroradiometry and digital image analysis confirm this maximums reality, and they show that its angular width and elevation vary with solar elevation, azimuth relative to the Sun, and aerosol optical depth. Many existing models of atmospheric scattering do not generate this near-horizon radiance maximum, but a simple second-order scattering model does, and it reproduces many of the maximums details.
- Atmospheric Physics