Accurate Predictions Of Mean Geomagnetic Dipole Excursion And Reversal Frequencies Mean Paleomagnetic Field Intensity And The Radius Of Earths Core Using Mcleods Rule

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Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.24/5 ( download)

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Download or read book Accurate Predictions of Mean Geomagnetic Dipole Excursion and Reversal Frequencies, Mean Paleomagnetic Field Intensity, and the Radius of Earth's Core Using McLeod's Rule written by and published by . This book was released on 1996 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781729076606
Total Pages : 42 pages
Book Rating : 4.02/5 ( download)

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Download or read book Accurate Predictions of Mean Geomagnetic Dipole Excursion and Reversal Frequencies, Mean Paleomagnetic Field Intensity, and the Radius of Earth's Core written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-22 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The geomagnetic spatial power spectrum R(sub n)(r) is the mean square magnetic induction represented by degree n spherical harmonic coefficients of the internal scalar potential averaged over the geocentric sphere of radius r. McLeod's Rule for the magnetic field generated by Earth's core geodynamo says that the expected core surface power spectrum (R(sub nc)(c)) is inversely proportional to (2n + 1) for 1 less than n less than or equal to N(sub E). McLeod's Rule is verified by locating Earth's core with main field models of Magsat data; the estimated core radius of 3485 kn is close to the seismologic value for c of 3480 km. McLeod's Rule and similar forms are then calibrated with the model values of R(sub n) for 3 less than or = n less than or = 12. Extrapolation to the degree 1 dipole predicts the expectation value of Earth's dipole moment to be about 5.89 x 10(exp 22) Am(exp 2)rms (74.5% of the 1980 value) and the expected geomagnetic intensity to be about 35.6 (mu)T rms at Earth's surface. Archeo- and paleomagnetic field intensity data show these and related predictions to be reasonably accurate. The probability distribution chi(exp 2) with 2n+1 degrees of freedom is assigned to (2n + 1)R(sub nc)/(R(sub nc). Extending this to the dipole implies that an exceptionally weak absolute dipole moment (less than or = 20% of the 1980 value) will exist during 2.5% of geologic time. The mean duration for such major geomagnetic dipole power excursions, one quarter of which feature durable axial dipole reversal, is estimated from the modern dipole power time-scale and the statistical model of excursions. The resulting mean excursion duration of 2767 years forces us to predict an average of 9.04 excursions per million years, 2.26 axial dipole reversals per million years, and a mean reversal duration of 5533 years. Paleomagnetic data show these predictions to be quite accurate. McLeod's Rule led to accurate predictions of Earth's core radius, mean paleomagnetic field intensity...

Author : C. Voorhies
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.80/5 ( download)

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Download or read book Elementary Theoretical Forms for the Spatial Power Spectrum of Earth's Crustal Magnetic Field written by C. Voorhies and published by . This book was released on 1998 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Publisher : Academic Press
ISBN 13 : 008056870X
Total Pages : 191 pages
Book Rating : 4.06/5 ( download)

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Download or read book Advances in Geophysics written by and published by Academic Press. This book was released on 1999-06-18 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Geophysics, Vol. 40 systematically compares many of the currently used statistical approaches to time series analysis and modeling to evaluate each method's robustness and application to geophysical datasets. This volume tackles the age-old problem of how to evaluate the relative roles of deterministic versus stochastic processes (signal vs noise) in their observations. The book introduces the fundamentals in sections titled "1.2 What is a Time Series? " and "1.3 How is a Time Series Quantified?", before diving into Spectral Analysis, Semivariograms, Rescaled-Range Analysis and Wavelet Analysis. The second half of the book applies their self-affine analysis to a number of geophysical time series (historical temperature records, drought hazard assessment, sedimentation in the context of hydrocarbon bearing strata, variability of the Earth's magnetic field). This volume explores in detail one of the main components of noise, that of long-range persistence or memory. The first chapter is a broad summary of theory and techniques of long-range persistence in time series; the second chapter is the application of long-range persistence to a variety of geophysical time series.

Author : Renata Dmowska
Publisher : Academic Press
ISBN 13 : 0120188406
Total Pages : 191 pages
Book Rating : 4.06/5 ( download)

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Download or read book Advances in Geophysics written by Renata Dmowska and published by Academic Press. This book was released on 1999-06-14 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This series provides a venue for longer reviews of current advances in geophysics. Written at a level accessible to graduate students, the articles serve to broaden knowledge of various fields and may be useful in courses and seminars.

Author :
Publisher :
ISBN 13 :
Total Pages : 1416 pages
Book Rating : 4.51/5 ( download)

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Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996-10 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : J. A. Jacobs
Publisher : Cambridge University Press
ISBN 13 : 0521450721
Total Pages : 357 pages
Book Rating : 4.20/5 ( download)

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Download or read book Reversals of the Earth's Magnetic Field written by J. A. Jacobs and published by Cambridge University Press. This book was released on 1994-11-24 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 1994 book examines how reversals of the Earth's magnetic field have played a major role in establishing plate tectonics and a geological time scale.

Author : Greig A. Paterson
Publisher : Frontiers Media SA
ISBN 13 : 2889458954
Total Pages : 106 pages
Book Rating : 4.50/5 ( download)

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Download or read book The Evolving Geomagnetic Field written by Greig A. Paterson and published by Frontiers Media SA. This book was released on 2019-06-21 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth’s magnetic field has protected our planet for billions of years and provides key insights into the internal workings of our home planet. The geomagnetic field varies in distinctive fashions across a broad spectrum of timescales from milliseconds to millions of years. To understand these variations, Earth scientists utilize a diverse arsenal of tools from hi-tech satellites, such as the Swarm array, to archeological pottery and geological materials, through to advanced numerical simulations that harness the power of supercomputers. Armed with these tools we tackle problems related to the ancient magnetic field, how the geodynamo works and what this means for modern life. Despite being studied for more than 400 years, there are many unanswered questions about the geomagnetic field. This Research Topic on “The Evolving Geomagnetic Field” brings together these varied approaches to present our latest understanding of the workings of the geodynamo and the geomagnetic field across all timescales.

Author : F.J. Lowes
Publisher : Springer
ISBN 13 :
Total Pages : 392 pages
Book Rating : 4.99/5 ( download)

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Download or read book Geomagnetism and Palaeomagnetism written by F.J. Lowes and published by Springer. This book was released on 1988-12-31 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, Newcastle upon Tyne, U.K., April 11-22, 1988

Author : E. Tema
Publisher : Geological Society of London
ISBN 13 : 1786204738
Total Pages : 237 pages
Book Rating : 4.38/5 ( download)

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Download or read book Geomagnetic Field Variations in the Past written by E. Tema and published by Geological Society of London. This book was released on 2020-10-15 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last decades, palaeomagnetic research has provided important information about the past variation of the Earth’s magnetic field (EMF) from its origin to the present day. However, questions regarding the origin and evolution of the EMF as well as the frequency and spatial distribution of its variations still remain open to debate. This Special Publication provides new insights into the study of the temporal and spatial evolution of the EMF presenting new data from palaeomagnetic and rock magnetic studies of archaeological materials, sediments and lavas. The papers presented cover a wide range of topics related to archaeology, stratigraphy and climate, including new data from several parts of the world, such as Europe, Africa, Australia, New Zealand, India and the Baltic Sea. This Special Publication aims to present an overview of the most recent secular variation studies and their use to disclose fundamental properties of the EMF evolution.