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28 December 1999 Simulation of full Earth disk measurement at L-1 of reflected solar radiation
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Abstract
The Triana spacecraft will be launched into a halo orbit around L-1, the first Lagrangian point, in late 2000. It will carry an active cavity radiometer for measuring outgoing longwave and reflected solar irradiance from the full disc of the Earth. The reflected solar radiation case is complex and requires computer simulation. The elements of the simulation are described. The purpose of the simulation is to develop a quantitative understanding of the effects of various factors on the measurements to aid in their interpretation. These factors include the variation of albedo over the Earth- atmosphere system, changes of albedo with solar zenith angle and anisotropy of the reflected solar radiation. Finally, there is a diurnal cycle of regional albedo due to clouds varying daily. The active cavity radiometer will also be very useful as a calibration standard for high spatial resolution results from the Earth Polychromatic Imaging Camera (EPIC). The EPIC will provide 10 km resolution imagery every 15 minutes over the Sun-lit face of the Earth, providing information at mesoscale space and time resolution about ozone, aerosols, water vapor and clouds.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
George L. Smith "Simulation of full Earth disk measurement at L-1 of reflected solar radiation", Proc. SPIE 3870, Sensors, Systems, and Next-Generation Satellites III, (28 December 1999); https://doi.org/10.1117/12.373169
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