Geomagnetic Micropulsations

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Geomagnetic Micropulsations

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Author : J. A. Jacobs
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Geomagnetic Micropulsations written by J. A. Jacobs and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.

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.

The Effect Of Geomagnetic Micropulsations On Mad Systems

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Author : James A. Brennan
language : en
Publisher:
Release Date : 1975

The Effect Of Geomagnetic Micropulsations On Mad Systems written by James A. Brennan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Geomagnetic micropulsations categories.

Spatial Uniformity Of Geomagnetic Micropulsations In The 0 001 Hz To 1 0 Hz Frequency Range And Over Distances Of The Order Of 250 Km

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Author : Rubén Zelwer
language : en
Publisher:
Release Date : 1971

Spatial Uniformity Of Geomagnetic Micropulsations In The 0 001 Hz To 1 0 Hz Frequency Range And Over Distances Of The Order Of 250 Km written by Rubén Zelwer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with categories.

Generation Of Artificial Geomagnetic Micropulsations With A Large Ground Based Current Loop

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Author : Stanford University. Stanford Electronics Laboratories
language : en
Publisher:
Release Date : 1972

Generation Of Artificial Geomagnetic Micropulsations With A Large Ground Based Current Loop written by Stanford University. Stanford Electronics Laboratories and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.

The purpose of this study is to investigate and, if possible, establish the feasibility of producing artificial geomagnetic micropulsations by using a large horizontal current loop on the ground. Most natural micropulsations appear to be produced by hydromagnetic (hm) waves propagating in the ionosphere and/or the magnetosphere, and the term 'artificial micropulsations' is used to mean artificially produced hm waves with propagation characteristics similar to those of the natural signals. The critical quantity in the generation process for the hm waves is to the amplitude of the magnetic field variation that can be produced in the ionospheric E-region by the ground-based loop. Currents are induced in the conducting earth beneath the loop whenever its current is varied, and these currents have a magnetic field opposing the magnetic field of the loop. If either the conductivity of the earth or the variation frequency is too high the field at E-region heights may be reduced to a level where negligible hm wave amplitudes are produced. The effect of these earth currents is calculated for an assumed single-layer earth and for a wide range of frequencies and earth conductivities. (Author).

Geophysical Electromagnetic Theory And Methods

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Author : Michael S. Zhdanov
language : en
Publisher: Elsevier
Release Date : 2009-06-12

Geophysical Electromagnetic Theory And Methods written by Michael S. Zhdanov and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-06-12 with Science categories.

In this book the author presents the state-of-the-art electromagnetic (EM)theories and methods employed in EM geophysical exploration.The book brings together the fundamental theory of EM fields and the practicalaspects of EM exploration for mineral and energy resources.This text is unique in its breadth and completeness in providing anoverview of EM geophysical exploration technology. The book is divided into four parts covering the foundations of EMfield theory and its applications, and emerging geophysical methods.Part I is an introduction to the field theory required for baselineunderstanding. Part II is an overview of all the basic elements ofgeophysical EM theory, from Maxwell's fundamental equations to modernmethods of modeling the EM field in complex 3-D geoelectrical formations. Part III deals with the regularized solution of ill-posedinverse electromagnetic problems, the multidimensional migration and imaging ofelectromagnetic data, and general interpretation techniques. Part IV describes major geophysical electromagnetic methods—direct current (DC), induced polarization (IP), magnetotelluric(MT), and controlled-source electromagnetic (CSEM) methods—and covers different applications of EM methods in exploration geophysics, includingminerals and HC exploration, environmental study, and crustal study. - Presents theoretical and methodological findings, as well as examples of applications of recently developed algorithms and software in solving practical problems - Describes the practical importance of electromagnetic data through enabling discussions on a construction of a closed technological cycle, processing, analysis and three-dimensional interpretation - Updates current findings in the field, especially with MT, magnetovariational and seismo-electrical methods and the practice of 3D interpretations

Micropulsation Observations Of The Auroral Oval Boundary

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Author : Elwood Maple
language : en
Publisher:
Release Date : 1974

Micropulsation Observations Of The Auroral Oval Boundary written by Elwood Maple and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Geomagnetic micropulsations categories.

At the sub-auroral-zone latitude (+54 degrees geomagnetic) of the AFCRL field station, geomagnetic micropulsations associated with the auroral oval are observed only during large nighttime disturbances. Hourly amplitudes of the horizontal component of the micropulsations in octave period bands in the 0.5 to 1024 sec period range are used as measures of the activity. Near local midnight, consistently small values are observed with local K indices

Nasa Thesaurus

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Author :
language : en
Publisher:
Release Date : 1998

Nasa Thesaurus written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Aeronautics categories.

Contains the authorized subject terms by which the documents in the NASA STI Database are indexed and retrieved.

Polar And Magnetospheric Substorms

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Author : Syun-Ichi Akasofu
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Polar And Magnetospheric Substorms written by Syun-Ichi Akasofu and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.

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).

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1973

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Aeronautics categories.

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Geomagnetism

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Author : John A. Jacobs
language : en
Publisher: Elsevier
Release Date : 2016-01-22

Geomagnetism written by John A. Jacobs and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-01-22 with Science categories.

Geomagnetism, Volume 4 focuses on the processes, methodologies, technologies, and approaches involved in geomagnetism, including electric fields, solar wind plasma, pulsations, and gravity waves. The selection first offers information on solar wind, magnetosphere, and the magnetopause of the Earth. Discussions focus on magnetopause structure and transfer processes, magnetosphere electric fields, geomagnetically trapped radiation, microstructure of the solar wind plasma, and hydro magnetic fluctuations and discontinuities. The text then examines geomagnetic tail, neutral upper atmosphere, and geomagnetic pulsations and plasma waves in the Earth's magnetosphere. Topics include plasma waves and instabilities in the magnetosphere, waves in a magneto plasma, gravity waves, atmospheric tides, balance equations for mass, momentum and energy, and absorption of solar and particle radiation. The publication takes a look at auroras and physical processes producing magnetosphere substorms and magnetic storms, including aurora theory and morphology, structure of the magnetosphere, and models of magnetosphere substorms. The selection is a valuable source of data for researchers wanting to explore geomagnetism. - Covers upper atmosphere physics, the magnetosphere, and solar wind - Expert team of contributors from all over the world - The fourth volume of the only comprehensive treatise covering all aspects of geomagnetism