An Analysis of Short Period (10-30 Seconds) Geomagnetic Micropulsations PDF Download

Author: John Henry Hassett
Publisher:
ISBN:
Category : Geomagnetism
Languages : en
Pages : 58

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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: Robert L. Kovach
Publisher:
ISBN:
Category :
Languages : en
Pages : 20

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Geomagnetic micropulsations in the period range of 0.3 to 120 seconds have been recorded on flux-rate variographs at many widespread locations: Palomar, California, since July 1955; Resolute Bay, Canada, since November 1957; Uppsala, Sweden, since July 1958; Reykjavik Iceland since June 1958; and Huancayo, Peru, since October 1958. The flux-rate variographs consist of pickup coils having a turns-area of 750 x 28,000 cm squared connected directly to galvanometers recording photographically with standard seismograph recording drums. (Author).

Author: Anthony David Eppstein
Publisher:
ISBN:
Category : Geomagnetism
Languages : en
Pages : 34

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Author:
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 718

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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 394

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Author: B.M. Båth
Publisher: Elsevier
ISBN: 0444599983
Category : Science
Languages : en
Pages : 580

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Spectral Analysis in Geophysics

Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 1400

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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1118

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Author: Alvin W Jenkins (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 23

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Book Description
An analysis is made of several possible sources for geomagnetic micropulsations of about one cycle per second. These include hydromagnetic waves propagated downward from the magnetospheric boundary, natural resonance of the ionospheric current system, sudden changes in ionospheric parameters, and the effect of meteors. The attenuation of hydromagnetic waves is calculated for an ionospheric model that include heavy negative ions. The results are inconclusive because of the technical difficulties involved in obtaining the mathematical solution. Resonance phenomena are found to produce effects at frequencies far removed from the one-cycle region. Meteor effects are a possible source of micropulsations at one cycle, and a detailed analysis is made for this case. (Author).