Twilight Rayleigh scattering observed from ground and space

J. Scott Evans; Douglas J. Strickland; Donald E. Anderson Jr.; Larry J. Paxton

doi:10.1117/12.140865

22 January 1993 Twilight Rayleigh scattering observed from ground and space

J. Scott Evans, Douglas J. Strickland, Donald E. Anderson Jr., Larry J. Paxton

Proceedings Volume 1764, Ultraviolet Technology IV; (1993) https://doi.org/10.1117/12.140865
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

A model is presented which calculates intensities of Rayleigh-scattered sunlight to large solar zenith angles (SZAs). The intensity integrand contains appropriate transmission functions and a volume emission rate profile with SZA varying along the line-of-sight. The calculation is performed for a spherically-symmetric model atmosphere and allows for limb and nonlimb viewing. We compare O I 6300 A nightglow and N2(+) 4278 A auroral signals to their Rayleigh-scattered counterparts at various SZAs beyond the terminator, addressing the major problems encountered by operational sensors when a rapid change in scattered sunlight intensity occurs at the terminator. To illustrate the effects of baffling systems, we examine three simple baffle designs being considered for a nadir-viewing photometer system to be flown on Defense Meteorological Satellite Program (DMSP) Block 5D3 satellites. The results show how far these photometers must be beyond the terminator to make good airglow and auroral measurements.

Citation Download Citation

J. Scott Evans, Douglas J. Strickland, Donald E. Anderson Jr., and Larry J. Paxton "Twilight Rayleigh scattering observed from ground and space", Proc. SPIE 1764, Ultraviolet Technology IV, (22 January 1993); https://doi.org/10.1117/12.140865

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