By Prof. Dr. Michael Gadsden, Dr. Wilfried Schröder (auth.)
An atmospheric phenomenon is taken into account as 'explained' once we have succeeded in deducing it at the foundation of approved ideas of physics. (H. Ertel, tools and difficulties of dynamical meteorolo gy,p. l) till lately, noctilucent clouds have been looked in basic terms as a curious atmos pheric phenomenon, the prevalence of which aroused purely restricted clinical cognizance. even though, within the final 20 years the curiosity they've been given has markedly elevated. The clouds, often faded blue in color, should be noticeable on a transparent evening at excessive latitudes. usual examples are illustrated within the ebook. Clouds taking a look like those in sunlight hours will be categorised as cirrostratus. What units noctilucent clouds aside is their prevalence in the course of the evening, their very seen faded blue color, and their disappearance into the sunrise just about the onset of civil twilight while the sunlight is 6° less than the horizon. as being set except usual Noctilucent clouds have been first well-known clouds in 1884/1885 and in a sequence of sightings that their go back in the summertime of 1885. That yr marked the start of observations and the translation of twilight phenomena. The impetus got here from the extraordi nary Krakatoa eruption, which was once not just essentially the most astounding volcanic eruptions in recorded background, yet which additionally grew to become out to be a startling occasion in atmospheric technological know-how with repercussions even in our time.
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Additional info for Noctilucent Clouds
The degree of polarization will not be changed by passage of the light down through the lower atmosphere after scattering from the clouds. If one knows the state of polarization of the light (usually this is assumed to be unpolarized) illuminating the clouds and one knows the optical properties of the cloud particles, measurement of the polarization of the light from the clouds can give estimates of the particle sizes in the clouds. In such an analysis, many of the problems associated with knowing the atmospheric absorption and refraction on any particular occasion are avoided.
This upper layer would give the edge ofthe illuminated area that they measured; consequently, they suggested that 7 km is a lower estimate (but by no more than a few kilometres) of the screening height. It is doubtful whether the concept of a "screening height" is basically meaningful. Taylor et al. (1984) suggested that the better dynamic range of modern photographic emulsions accounted for the lower screening height which they deduced, compared with the earlier (largely 19th century) estimates.
3 m S-1 (ten measurements), whereas Dirikis et al. 5 m S-1 (32 measurements). It has been found that over a short time interval parts of the noctilucent cloud stopped their ascent and started to descend, at the same time changing the azimuth of motion. The horizontal velocity changed little. Quiroz (1964) had earlier suggested that this behaviour is not unlike the pattern of vertical wind speeds revealed in rocket measurements. Rosenberg and Edwards (1964) suggested that both atmospheric tides and internal gravity waves may be responsible for the behaviour.
Noctilucent Clouds by Prof. Dr. Michael Gadsden, Dr. Wilfried Schröder (auth.)