Geomagnetism and Palaeomagnetism

✍ Scribed by A. De Santis, D. J. Kerridge, D. R. Barraclough (auth.), F. J. Lowes, D. W. Collinson, J. H. Parry, S. K. Runcorn, D. C. Tozer, A. Soward (eds.)

• Publisher: Springer Netherlands
• Year: 1989
• Tongue: English
• Leaves: 366
• Series: NATO ASI Series 261
• Edition: 1
• Category: Library

✦ Synopsis

This volume presents lectures given at the NATO Advanced Study Institute held 11-22 April 1988 at Newcastle upon Tyne, England. The aim of the Institute was to improve the interaction between workers in observational geomagnetism (using historical data) and archaeo- and palaeo-magnetism (using the remanent magnetization of man-made artefacts and of natural sediments and rocks) and those trying to interpret the data in terms of mechanisms inside or outside the Earth, particularly those developing dynamo theories of the field. The material discussed ranged from magnetic bacteria swimming round a circle in a few seconds, the effect of El Nino, through secular variation with time scales of tens to thousands of years and the'mechanics of individual field reversals and excursions (aborted reversals?) to possible modulation of average reversal frequency on the hundred million year time scale. Many members of the Physics Department helped with the organization, and we are most grateful to them, and in particular to Anne Codling for her very many contributions. We also gratefully acknowledge the painstaking work of Aileen Dryburgh and Lynn Whiteford in so carefully typing the manuscript.

✦ Table of Contents

Front Matter....Pages i-x
A Spherical Cap Harmonic Model of the Crustal Magnetic Anomaly Field in Europe Observed by Magsat....Pages 1-17
Geomagnetic Secular Variation....Pages 19-30
Historical Secular Variation and Geomagnetic Theory....Pages 31-43
Changes in the Earth’s Rate of Rotation on an El Niño to Century Basis....Pages 45-53
Geomagnetic Secular Variation in Britain During the Last 2000 Years....Pages 55-62
Detailed Palaeomagnetic Record for the Last 6300 Years from Varved Lake Deposits in Northern Sweden....Pages 63-70
The Lac Du Bouchet Palaeomagnetic Record: Its Reliability and Some Inferences about the Character of Geomagnetic Secular Variations Through the Last 50000 Years....Pages 71-89
Developments in Cave Sediment Palaeomagnetism....Pages 91-106
Evidence for Wave Propagation in the Holocene Palaeomagnetic Field....Pages 107-121
Bruhnes Chron Geomagnetic Excursion Recorded During the Late Pleistocene, Albuquerque Volcanoes, New Mexico, U.S.A.....Pages 123-136
Short Reversal of the Palaeomagnetic Field about 280 000 Years Ago at Long Valley, California....Pages 137-153
Magnetic Polarity Time Scales and Reversal Frequency....Pages 155-183
Observations and Models of Reversal Transition Fields....Pages 185-203
A Phenomenological Model for Reversals of the Geomagnetic Field....Pages 205-214
Deterministic Chaos, Geomagnetic Reversals, and the Spherical Pendulum....Pages 215-226
Geomagnetic Polarity Reversals: Can Meteor Impacts Cause Spall Disruption into the Outer Core....Pages 227-230
Magnetic Bacteria in Lake Sediments....Pages 231-241
Magnetization of Sediments and Depositional Environment....Pages 243-252
Timing Between a Large Impact and a Geomagnetic Reversal and the Depth of NRM Acquisition in Deep-Sea Sediments....Pages 253-261
Tests of Magnetic Properties of New Zealand Pliocene Marine Mudstones....Pages 263-269
Some Aspects of the Measurement of Magnetic Anisotropy....Pages 271-278
The Magnetism of Ordinary Chondrites and SNC Meteorites: Possible Implications for Ancient Solar System Magnetic Fields....Pages 279-295
Geodynamo Theory....Pages 297-317
Long-Term Palaeofield Variations and the Geomagnetic Dynamo....Pages 319-334
Compositional Convection and the Earth’S Core....Pages 335-346
Numerical Models in the Theory of Geomagnetism....Pages 347-358
Back Matter....Pages 359-370

✦ Subjects

Geophysics/Geodesy