Titlebook: Noctilucent Clouds; Michael Gadsden,Wilfried Schr?der Book 1989 Springer-Verlag Berlin Heidelberg 1989 Absorption.Cloud.Variation.atmosphe

Functional

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0079-1938 eir return in the summer of 1885. That year marked the beginning of observations and the interpretation of twilight phenomena. The impetus came from the extraor978-3-642-48628-9978-3-642-48626-5Series ISSN 0079-1938

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Environment of Noctilucent Clouds,ee path of air molecules, their mean velocity, the number density and the flux passing a plane surface. In calculating the values given in Table 9.1, the cross-sectional area of a molecule was taken as 4.417 X 10″19 m2, in accordance with viscosity data, and the mass of an air “molecule” was set equal to 4.845 X 10″26 kg.

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氣候

Observations from Ground Level,rticles, whatever they may be, scatter light as individuals not as an assembly. Furthermore, there is a negligible amount of rescattering in the cloud: having been once scattered, sunlight emerges from the cloud without further scattering.

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Book 1989, Methods and problems of dynamical meteorolo- gy,p. l) Until recently, noctilucent clouds were regarded merely as a curious atmos- pheric phenomenon, the occurrence of which aroused only limited scientific attention. However, in the last two decades the interest they have been given has markedly in

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