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Author: James I. Metcalf
Publisher:
ISBN:
Category : Atmospheric electricity
Languages : en
Pages : 40
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Book Description
Author: James I. Metcalf
Publisher:
ISBN:
Category : Atmospheric electricity
Languages : en
Pages : 40
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Book Description
Author: James I. Metcalf
Publisher:
ISBN:
Category : Atmospheric electricity
Languages : en
Pages : 38
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Book Description
The changing orientations of hydrometeors due to rapidly changing electric fields in clouds have been observed for the first time at a radar wavelength of 11 cm (S-band) with the polarimetric Doppler radar operated in Sudbury, MA by the Geophysics Directorate of Phillips Laboratory. During 1991 the radar was operated in a half-matrix mode, transmitting a signal of right circular polarization and receiving signals of right and left circular polarization. Observations of electrified storms on nine days during the spring and summer of 1991 revealed several occurrences of lightning that coincided with significant changes of the circular depolarization ratio (CDR), the cross-correlation, or the phase of the cross-covariance of the two received signals. We observed changes up to 2 dB in CDR, 50% in cross-correlation, and 40° in phase. However, many occurrences of lightning observed by radar were not accompanied by detectable changes of hydrometeor orientations, and we did not observe the cyclical changes of the polarimetric quantities that have been observed elsewhere with radars of shorter wavelength. We present examples of our observations and discuss implications for future measurements with this radar.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Author:
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ISBN:
Category : Geophysics
Languages : en
Pages : 40
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Author: IEEE Staff
Publisher:
ISBN: 9781728162553
Category :
Languages : en
Pages :
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Rapid urbanization and climate change are two forces that make weather events very high impact Therefore, it is of extreme importance to make accurate and timely meteorological observations to support forecasts and warnings and Numerical Weather Prediction Just as the resolution of numerical models are improving and the spatial and temporal resolution of short term forecasts are improving the demand for fine scale observations have also increased We are living in an era of fine scale intelligent monitoring of the atmosphere The conference will be a forum for participants to share and exchange research concepts and and experiences regarding meteorological observations in the world
Author: Martin A. Uman
Publisher: Courier Corporation
ISBN: 0486151980
Category : Science
Languages : en
Pages : 395
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Absorbing monograph by expert sets forth most of known properties of lightning: cloud and lightning charges, stepped leader, return stroke, dart leader, lightning on other planets, thunder, more. 144 illustrations.
Author: S. Raghavan
Publisher: Springer Science & Business Media
ISBN: 9401702012
Category : Science
Languages : en
Pages : 557
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Book Description
As we all know, weather radar came into existence during the Second World War when aircraft detection radars had their vision limited by echoes from rain bearing clouds. What was often considered to be of nuisance value by the air force personnel trying to locate enemy aircraft was seen as an opportunity by the weather men. Thus adversity in one field was converted into an opportunity in another. Since then weather radar has found myriad applications with the increased sophistication of technology and processing systems. It has now become an indispensable tool for the operational forecasters, cloud physicists and atmospheric scientists. The current generation radar is but a distant echo of the radars of the 1940s. As a result, its operation and maintenance have become very complex, like the technology it uses. Therefore, there is a definite requirement of focussing our special attention not only on the science of radar meteorology but also on its operational aspects. The present book, as pointed out by the author, attempts to fill this gap. The author has presented the subject with a balanced blend of science, technology and practice. The canvas is indeed very broad. Starting with the history of weather radar development the book goes on to discuss in a lucid style the physics of the atmosphere related to radar observation, radar technology, echo interpretation, different applications and finally attempts to look into the future to indicate potential new opportunities in this field.
Author: Vladimir A. Rakov
Publisher: Cambridge University Press
ISBN: 9780521583275
Category : Science
Languages : en
Pages : 734
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Table of contents
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 12
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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