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

Author :
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 Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722043391
Total Pages : 40 pages
Book Rating : 4.93/5 ( 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 National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-28 with total page 40 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:

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 : 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 : Lisa Tauxe
Publisher : Univ of California Press
ISBN 13 : 0520260317
Total Pages : 505 pages
Book Rating : 4.13/5 ( download)

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Download or read book Essentials of Paleomagnetism written by Lisa Tauxe and published by Univ of California Press. This book was released on 2010-03-19 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book by Lisa Tauxe and others is a marvelous tool for education and research in Paleomagnetism. Many students in the U.S. and around the world will welcome this publication, which was previously only available via the Internet. Professor Tauxe has performed a service for teaching and research that is utterly unique."—Neil D. Opdyke, University of Florida

Author : Coerte V. Voorhies
Publisher : BiblioGov
ISBN 13 : 9781289290283
Total Pages : 30 pages
Book Rating : 4.88/5 ( download)

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Download or read book On Geomagnetism and Paleomagnetism I written by Coerte V. Voorhies and published by BiblioGov. This book was released on 2013-08 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A partial description of Earth's broad scale, core-source magnetic field has been developed and tested three ways. The description features an expected, or mean, spatial magnetic power spectrum that is approximately inversely proportional to horizontal wavenumber atop Earth's core. This multipole spectrum describes a magnetic energy range; it is not steep enough for Gubbins' magnetic dissipation range. Temporal variations of core multipole powers about mean values are to be expected and are described statistically, via trial probability distribution functions, instead of deterministically, via trial solution of closed transport equations. The distributions considered here are closed and neither require nor prohibit magnetic isotropy. The description is therefore applicable to, and tested against, both dipole and low degree non-dipole fields. In Part 1, a physical basis for an expectation spectrum is developed and checked. The description is then combined with main field models of twentieth century satellite and surface geomagnetic field measurements to make testable predictions of the radius of Earth's core. The predicted core radius is 0.7% above the 3480 km seismological value. Partial descriptions of other planetary dipole fields are noted.

Author : Ronald T. Merrill
Publisher : Academic Press
ISBN 13 : 9780124912465
Total Pages : 556 pages
Book Rating : 4.6X/5 ( download)

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Download or read book The Magnetic Field of the Earth written by Ronald T. Merrill and published by Academic Press. This book was released on 1998 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topics involved in studies of the Earth's magnetic field and its secular variation range from the intricate observations of geomagnetism, to worldwide studies of archeomagnetism and paleomagnetism, through to the complex mathematics of dynamo theory. Traditionally these different aspects of geomagnetism have in the main been studied and presented in isolation from each other. This text draws together these lines of inquiry into an integrated framework to highlight the interrelationships and thus to provide a more comprehensive understanding of the geomagnetic field.

Author :
Publisher :
ISBN 13 :
Total Pages : 696 pages
Book Rating : 4.33/5 ( 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 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : L. Tauxe
Publisher : Springer Science & Business Media
ISBN 13 : 0306481286
Total Pages : 302 pages
Book Rating : 4.84/5 ( download)

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Download or read book Paleomagnetic Principles and Practice written by L. Tauxe and published by Springer Science & Business Media. This book was released on 2005-12-17 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paleomagnetic data are useful in many applications in Earth Science from determining paleocurrent directions to analyzing the long-term behavior of the geomagnetic field. In this book, an attempt has been made to draw together the various principles and practices within paleomagnetism in a consistent and up-to-date manner. It includes many practical examples that illustrate various applications of paleomagnetism. A companion software package implements the theory explained in the text. Audience: This volume is aimed at professional Earth Scientists using paleomagnetic data for their research. It is also suitable for use as a text book for students in courses with a paleomagnetic content. In addition, this volume will be of value to other professionals with an interest in the analysis of vector and tensor data in general.