Radar Angels and Their Relationship to Meteorological Factors PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Radar Angels and Their Relationship to Meteorological Factors PDF full book. Access full book title Radar Angels and Their Relationship to Meteorological Factors by Hans Óttersten. Download full books in PDF and EPUB format.
Author: Hans Óttersten Publisher: ISBN: Category : Radar echoes Languages : en Pages : 36
Book Description
From a year-long study of radar angels, carried out near Stockholm, Sweden, with a 10-cm vertically-pointing pulse radar, tropograms, or time-heightrecords of angel activity, have been obtained together with information on meteorological parameters. Amplitude records of individual angel echoes have also been studied. Various types of radar angels are exemplified, and the seasonal variation and the height distribution of the angel activity is reviewed. Theoretical approaches to meteorological explanations of angel phenomena are discussed in terms of the consequences for the tropospheric refractive-index field. The statistical relationship between radar angels and meteorological parameters is presented, and explanations of the angel phenomena are offered. Layer angels, which are persistent, diffuse, layer-type echoes, occur due to backscattering from clear-air refractive-index perturbations associated with free convection, or with turbulent mixing induced by wind shear in zones of enhanced static stability. Dot angels, which are short-duration, coherent echoes from apparent point targets, are difficult to explain as reflections from invisible meteorological targets and are mainly caused by insects and birds. (Author).
Author: Hans Óttersten Publisher: ISBN: Category : Radar echoes Languages : en Pages : 36
Book Description
From a year-long study of radar angels, carried out near Stockholm, Sweden, with a 10-cm vertically-pointing pulse radar, tropograms, or time-heightrecords of angel activity, have been obtained together with information on meteorological parameters. Amplitude records of individual angel echoes have also been studied. Various types of radar angels are exemplified, and the seasonal variation and the height distribution of the angel activity is reviewed. Theoretical approaches to meteorological explanations of angel phenomena are discussed in terms of the consequences for the tropospheric refractive-index field. The statistical relationship between radar angels and meteorological parameters is presented, and explanations of the angel phenomena are offered. Layer angels, which are persistent, diffuse, layer-type echoes, occur due to backscattering from clear-air refractive-index perturbations associated with free convection, or with turbulent mixing induced by wind shear in zones of enhanced static stability. Dot angels, which are short-duration, coherent echoes from apparent point targets, are difficult to explain as reflections from invisible meteorological targets and are mainly caused by insects and birds. (Author).
Author: V. Alistair Drake Publisher: CABI ISBN: 184593556X Category : Science Languages : en Pages : 515
Book Description
This book (10 chapters) covers radar entomology and its application in the study and monitoring of insect flight and migration. Chapter 1 provides a general introduction to both radar and the biological phenomena that entomologists have studied with radars. An outline of alternative and complementary methods for studying insect movement and a brief historical account of developments in the field are included. Chapter 2 introduces the fundamentals of remote sensing and briefly summarizes some entomological applications of it that do not involve radio technology. The technique and theory underlying radar entomology are covered in chapters 3-8, whereas the principal biological findings that have resulted from the use of radar technology are discussed in chapters 9-14. This book is intended primarily for entomologists, although this publication may also be useful to behaviourists, ecologists, biometeorologists, radar ornithologists and radar meteorologists.
Author: Hans Óttersten Publisher: ISBN: Category : Clear air turbulence Languages : en Pages : 80
Book Description
Turbulence due to vertical wind shear at the tropopause temperature inversion produces small-scale temperature irregularities which cause echoes on sensitive microwave radars and allow monitoring of the tropopause level and study of the progression of dynamic instability and turbulence generation in the clear atmosphere. For tropopause temperatures below about -45 to -50°C, the structure constant C2T, a characteristic measure of temperature variability within the inertial subrange, may be determined from radar reflectivity with an error less than 3 dB by neglecting water vapor contributions to refractive-index variability.
Author: Wilbur H. Paulsen Publisher: ISBN: Category : Backscattering Languages : en Pages : 20
Book Description
A review is made of the assumptions that must be made in using a weather radar set for quantitative measurements of weather echoes. A simplified derivation is provided showing the relationship between the purely meteorological 'radar reflectivity factor' Z and the radar received power for any weather radar set when the assumptions are fulfilled. A nomogram furnished for use with the AN/FPS-77 enables a simple conversion of receiver power to Z values. (Author).
Author: Hans Óttersten
Author: Hans Óttersten
Author: V. G. Plank
Author: V. Alistair Drake
Author: 
Author: Vernon G. Plank
Author: 
Author: Dharmbir Rai
Author: Hans Óttersten
Author: Dean A. Wilson
Author: Wilbur H. Paulsen