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Author: Fred Ward Publisher: ISBN: Category : Atmospheric circulation Languages : en Pages : 34
Book Description
There are many theories of the large-scale circulation of the sun. Fundamental to many of these is a meridional cell which transports momentum between the pole and equator. Observational verification has devolved most often upon the analysis of the latitudinal drifts of sunspots. A comprehensive analysis of sunspot drifts shows some peculiar results. Two conclusions can be drawn from these results. First, sunspot data cannot be used to verify the existence of a mean meridional circulation on the sun. Second, the residual meridional drifts (averaged over time and longitude) are very much smaller than their day-to-day counterparts, lending support to the idea that the latter are the more fundamental to the large-scale solar circulation. (Author).
Author: Fred Ward Publisher: ISBN: Category : Atmospheric circulation Languages : en Pages : 34
Book Description
There are many theories of the large-scale circulation of the sun. Fundamental to many of these is a meridional cell which transports momentum between the pole and equator. Observational verification has devolved most often upon the analysis of the latitudinal drifts of sunspots. A comprehensive analysis of sunspot drifts shows some peculiar results. Two conclusions can be drawn from these results. First, sunspot data cannot be used to verify the existence of a mean meridional circulation on the sun. Second, the residual meridional drifts (averaged over time and longitude) are very much smaller than their day-to-day counterparts, lending support to the idea that the latter are the more fundamental to the large-scale solar circulation. (Author).
Author: Arnab Rai Choudhuri Publisher: OUP Oxford ISBN: 0191662380 Category : Science Languages : en Pages : 274
Book Description
The cycle of day and night and the cycle of seasons are two familiar natural cycles around which many human activities are organized. But is there a third natural cycle of importance for us humans? On 13 March 1989, six million people in Canada went without electricity for many hours: a large explosion on the sun was discovered as the cause of this blackout. Such explosions occur above sunspots, dark features on the surface of the Sun that have been observed through telescopes since the time of Galileo. The number of sunspots has been found to wax and wane over a period of 11 years. Although this cycle was discovered less than two centuries ago, it is becoming increasingly important for us as human society becomes more dependent on technology. For nearly a century after its discovery, the cause of the sunspot cycle remained completely shrouded in mystery. The 1908 discovery of strong magnetic fields in sunspots made it clear that the 11-year cycle is the magnetic cycle of the sun. It is only during the last few decades that major developments in plasma physics have at last given us the clue to the origins of the cycle and how the large explosions affecting the earth arise. Nature's Third Cycle discusses the fascinating science behind the sunspot cycle, and gives an insider's perspective of this cutting-edge scientific research from one of the leaders of the field.
Author: Elizabeth Nesme-Ribes Publisher: Springer Science & Business Media ISBN: 364279257X Category : Science Languages : en Pages : 560
Book Description
The message of sunspots from the interior of the Sun to the Earth's climate When Galileo was summoned before the Inquisition on April 12, 1633, the main accusations laid against him concerned the doubts he expressed about Aristotle's theory of the universe. Aristotle's idea was that the Earth was the centre of the cosmos and that all of the stars, including the Sun, turned around it. Moreover, for Aristotle and the world of the Inquisitors, the Sun was a perfect celestial body. Now, Galileo had discovered spots on the Sun. These spots were seen as imperfections, and not just surface markings, but coming from within the Sun. Worse yet, they revolved around the Sun. All this supported the newfangled theory of Copernicus, and undermined a system of thought that had reigned supreme for centuries. Man of science that he was, and a prudent Catholic too, Galileo strived all his life to prove that Copernicus' astronomical concept was compatible with the word of the Bible. He proposed that there were not two truths but a single divine truth. It was just expressed in two different languages : there was the language of the common people, with its imprecision and inconsistencies, but intuitively understandable by everyone; and then there was the precise language of science with its strict regard for observation, which only a chosen few can grasp [L. Geymonat. 1992].
Author: Jean-Louis Tassoul Publisher: Princeton University Press ISBN: 140086898X Category : Science Languages : en Pages : 524
Book Description
Ever since the first observations of sunspots in the early seventeenth century, stellar rotation has been a major topic in astronomy and astrophysics. Jean-Louis Tassoul synthesizes a large number of theoretical investigations on rotating stars. Drawing upon his own research, Professor Tassoul also carefully critiques various competing ideas. In the first three chapters, the author provides a short historical sketch of stellar rotation, the main observational data on the Sun and other stars on which the subsequent theory is based, and the basic Newtonian hydrodynamics used to study rotating stars. Following a discussion of some general mechanical properties of stars in a state of permanent rotation, he reviews the main techniques for determining the structure of a rotating star and its stability with respect to infinitesimal disturbances. Since the actual distribution of angular momentum within stars is still unknown, Professor Tassoul considers various models of angular momentum as well as of meridional circulation. He devotes the rest of his study to the problems concerning various groups of stars and stages in stellar evolution. Originally published in 1979. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Author: Fred Ward
Author: Fred Ward
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Author: Air Force Cambridge Research Laboratories (U.S.)
Author: Arnab Rai Choudhuri
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Author: Elizabeth Nesme-Ribes
Author: Jean-Louis Tassoul