Geomagnetic Micropulsations and Diagnostics of the Magnetosphere PDF Download
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Author: V. A.. Troitskaya
Publisher:
ISBN:
Category :
Languages : en
Pages : 79
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Book Description
Author: V. A.. Troitskaya
Publisher:
ISBN:
Category :
Languages : en
Pages : 79
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Book Description
Author: A. Nishida
Publisher: Springer Science & Business Media
ISBN: 3642868258
Category : Science
Languages : en
Pages : 264
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Book Description
The geomagnetic field observed on the surface of the earth has been an important source of information on the dynamic behavior of the magnetosphere. Because the· magnetosphere and its environment are filled with plasma in which electric current can easily flow, dynamic processes that occur in the magnetosphere tend to produce perturba tions in the geomagnetic field. Geomagnetic data have therefore pro vided valuable means for sensing the processes taking place at remote locations, and such basic concepts as the magnetosphere, solar wind, and trapped radiation were derived in early, presatellite days from geomagnetic analyses. Because of this advantage, geomagnetic observations have been widely utilized for monitoring the overall condition of the magneto sphere. Although the advent of space vehides has made it possible to observe magnetospheric processes in situ, supplementary information on the overall magnetospheric condition is frequently found to be indispensable for interpreting these observations in the proper perspec tive. Hence for magnetospheric physicists involved in various branches of the field it has become a common practice to employ geomagnetic data as a basic diagnostic tool.
Author: J. A. Jacobs
Publisher: Springer Science & Business Media
ISBN: 3642868282
Category : Science
Languages : en
Pages : 187
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Book Description
The subject of geomagnetic micropulsations has developed extremely rapidly and it is difficult to know when is an appropriate time to pause and assess the sum total of our knowledge-both observational and theoretical. There has in recent years been a tremendous increase in both the quantity and quality of data and also many theoretical ad vances in our understanding of the phenomenon. Undoubtedly there will be further progress in both areas but it seems worthwhile now to review both our knowledge and our ignorance. This book was essen tially completed by the end of April 1969 and tries to give a summary of the subject up to that time. The Earth is enclosed in the magnetosphere, a hollow carved out of the solar wind by the Earth's magnetic field. Above the ionosphere there is a very tenuous thermal plasma of partially ionized hydrogen in diffusive equilibrium with magnetic and gravitational forces, and ener getic protons and electrons that constitute the trapped Van Allen ra diation belts. Throughout this anisotropic and inhomogeneous plasma, natural and man-made electromagnetic energy propagates in a wide variety of modes and frequency bands. This book is concerned with that class of natural signals called geomagnetic micropulsations-short period (usually of the order of seconds or minutes) fluctuations of the Earth's magnetic field.
Author: V. L. Patel
Publisher:
ISBN:
Category : Geomagnetic micropulsations
Languages : en
Pages : 0
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Book Description
Micropulsation periods determined from the surface geomagnetic filed observations and the size of the magnetosphere represented by the radial distance of the magnetopause have been studied by using extensive data from the satellites IMP-A, B, C, D, E and F. For micropulsation periods in the range 20 ≤ T ≤ 120 sec, the relation between the period T and the magnetopause distance Rm in earth radii is T ~ R^nm where n = 8.8. The power law dependence is obtained for the various subgroups of micropulsation periods. The comparison of these results with earlier studies show that the reproducible and consistent results are obtained only in the range 20 ≤ T ≤ 60 with n ≈ 4.7. Importance of results obtained in this study are discussed for the possible use of the micropulsation periods as diagnostic too for the magnetospheric parameters.
Author: D. Orr
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
Author: Leonid S. Alperovich
Publisher: Springer Science & Business Media
ISBN: 1402066376
Category : Science
Languages : en
Pages : 437
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Book Description
Here is a fascinating text that integrates topics pertaining to all scales of the MHD-waves, emphasizing the linkages between the ULF-waves below the ionosphere on the ground and magnetospheric MHD-waves. It will be most helpful to graduate and post-graduate students, familiar with advanced calculus, who study the science of MHD-waves in the magnetosphere and ionosphere. The book deals with Ultra-Low-Frequency (ULF)-electromagnetic waves observed on the Earth and in Space.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Robert Knott
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 234
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Book Description
Author: C. D. Ellyett
Publisher:
ISBN:
Category :
Languages : en
Pages : 157
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Book Description
The report details original equipment for continuously recording Pc1 geomagnetic micropulsations on magnetic tape with timing accuracy of less than 0.1 second. Analysis of the records is carried out by using both frequency-time and amplitude-time techniques. An extensive study of temporal variations in Pc1 in relation to propagation in the magnetosphere is detailed. Signals are generated in the lambda = 4.5 - 9.5 region of the magnetosphere and show diurnal and geomagnetic disturbance variations. The theoretical problem of north-south propagation of Pc1 signals in an ionospheric duct is treated. Comparison with experimental results show that wave group velocities in the duct vary from 400 to 800 km/sec, depending on the electron concentration in the duct and hence local time. (Author).
Author: Syun-Ichi Akasofu
Publisher: Springer Science & Business Media
ISBN: 9401034613
Category : Science
Languages : en
Pages : 293
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Book Description
It has become increasingly clear that the magnetosphere becomes intermittently unstable and explosively releases a large amount of energy into the polar upper atmos phere. This particular magnetospheric phenomenon is called the magnetospheric sub storm. It is manifested as an activity or disturbance ofvarious polar upper atmospheric phenomena, such as intense auroral displays and X-ray bursts. Highly active conditions in the polar upper atmosphere result from a successive occurrence of such an element ary activity, the polar substorm, which lasts typically of order one to three hours. The concept of the magnetospheric substorm and its manifestation in the polar upper atmosphere, the polar substorm, has rapidly crystallized during the last few years. We can find a hint of such a concept in the term 'polar elementary storm' introduced by Kristian Birkeland as early as 1908. However, we are greatly indebted to Sydney Chapman, who established the basic foundation of magnetospheric physics and has led researches in this field during the last half century. Indeed, the terms 'polar magnetic substorm' and 'auroral substorm' were first suggested by Sydney Chapman. The concept of the substorm was then soon extended by Neil M. Brice of Cornell University, and Kinsey A. Anderson and his colleagues at the University ofCaliforrlia, Berkeley, who introduced the term 'magnetospheric substorm'. We owe many of these recent developments in magnetospheric physics to the great international enterprise, the International Geophysical Year (IGY) and subse quent international cooperative effort (IGC, IQSY).
