But by going to the Pic du Midi Observatory high in the French Pyrenees, where the high altitude resulted in less atmospheric diffusion, and by equipping his coronagraph with an improved lens and a monochromatic filter that he had developed, Lyot succeeded in making daily photographs of the Sun's corona.
This is a semiempirical approach combining the atmospheric diffusion equation and Lagrangian methodology.
CD carried out the atmospheric diffusion modeling and the exposure quantification.
Furthermore, the atmospheric diffusion of Pb and Hg is significant, resulting in their migration to agricultural areas.
The present study discusses the applicability of LES to several issues such as wind-resistant design, prediction of wind velocity affected by terrain or ground surface conditions, and estimation of turbulence structures and atmospheric diffusion in urban areas.
Prediction of ozone levels using a theoretical method (i.e. detailed atmospheric diffusion model) is difficult and empirical analysis is required to develop a forecasting system.
In particular, we vary the total mass, the total grain-size distribution, the column height, and the effective atmospheric diffusion coefficient to evaluate how these parameters affect the hazard probability maps.
Seinfeld (1986) proposed the atmospheric diffusion equation, from which the theoretical model (Pryor and Steyn 1995; Jorquera, and Acuna 1998) used for this study was developed: dC dt = − V. ∇ C + ∇.
Particles are then advected by a steady-state wind at source and spread out by atmospheric diffusion, diluting their concentration.
The coronagraph must be used at high altitudes and on very clear days, when the atmospheric diffusion of light is at a minimum; imperfect lenses or dust inside the instrument will scatter enough photospheric light to obscure the dim solar corona.
