Download Free Polarization Of The Light In The Solar Corona Book in PDF and EPUB Free Download. You can read online Polarization Of The Light In The Solar Corona and write the review.

Photographs of the solar corona from a camera flown at an altitude of 40,000 feet were obtained on November 12, 1966. The absolute brightness, polarization and the direction of polarization of the solar corona between 3.5 and 13 solar radii were determined from these photographs. A significant polarized component was found in this region, the structure of which can be closely correlated with features in the inner corona. Comparisons are made in the July 20, 1963 and May 30, 1965 eclipses and evidence is given for changes in brightness of the coronal light between these eclipses. (Author).
The subject of this volume is two-fold. First, it gathers typical polarization patterns occurring in nature. Second, it surveys the polarization-sensitive ani mals, the physiological mechanisms and biological functions of polarization sensitivity as weIl as the polarization-guided behaviour in animals. The monograph is prepared for biologists, physicists and meteorologists, espe cially for experts of atmospheric optics and animal vision, who wish to under stand and reveal the message hidden in polarization patterns of the optical environment not directly accessible to the human visual system, but measur able by polarimetry and perceived by many animals. Our volume is an attempt to build a bridge between these two physical and biological flelds. In Part I we introduce the reader to the elements of imaging polarimetry. This technique can be efflciently used, e. g. in atmospheric optics, remote sens ing and biology. In Part 11 we deal with typical polarization patterns of the natural optical environment. Sunrise/sunset, clear skies, cloudy skies, moonshine and total solar eclipses all mean quite different illumination conditions, wh ich also affect the spatial distribution and strength of celestial polarization. We pre sent the polarization patterns of the sky and its unpolarized (neutral) points under sunlit, moonlit, clear, cloudy and eclipsed conditions as a function of solar elevation. The polarization pattern of a rainbow is also shown. That part of the spectrum is derived in which perception of skylight polarization is optimal under partly cloudy skies.
An examination of photographic material obtained during the total solar eclipse over Turkmenian SSR in February 1952 resulted in the following conclusions concerning the polarization of the coronal radiation: (1) The fact that the corona is not spherically symmetrical with regard to radiation is again confirmed. (2) The degree of polarization is linked directly with solar activity. (3) Since the coronal luminescence is polarized radially, it is not necessary to photograph the corona in three positions of the analyzer if a polarographic examination of fine details is not desired. (4) No link between chromospheric observations and the orientation of the plane of polarization was detected. (5)A link between solar activity and the distance of maximum polarization from the solar surface is probably present, but it needs more precise definition. (6) In order to retain the galvanometric readings in the rectilinear portion of the characteristic curve, it is necessary to photograph the corona simultaneously in several positions of the analyzer. (7) Formulas were derived for photographing with four positions of the analyzer. (8) Marblith analyzers are preferable to polaroids.
A Guide to the Solar Corona is specifically directed to the space scientist or engineer who is not a specialist in solar physics, but whose work requires a fairly detailed knowledge of the corona. It is hoped that the material may prove useful to most graduate students in astrophysics, while solar physicists may find some topics of interest and value to them. The book contains 12 chapters and begins with three descriptive chapters that provide the casual reader with a concept of the corona as it is evident through more or less direct observation. Topics covered include the development of coronal science, observational techniques, and observational aspects of the corona. The next chapter discusses methods of analyzing coronal data. Subsequent chapters present theoretical considerations as they are applicable to the corona. These combine theory with observation to provide a description of the various aspects of the corona. The final chapter is a combination of established ideas and speculation on the place of the corona in the universe.