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The Earth's Core: Its Structure, Evolution and Magnetic Field || Front Matter

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Front Matter Source: Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 306, No. 1492, The Earth's Core: Its Structure, Evolution and Magnetic Field (Aug. 20, 1982), pp. 1-3 Published by: The Royal Society Stable URL: http://www.jstor.org/stable/37176 . Accessed: 08/05/2014 02:04 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. . The Royal Society is collaborating with JSTOR to digitize, preserve and extend access to Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences. http://www.jstor.org This content downloaded from 169.229.32.137 on Thu, 8 May 2014 02:04:10 AM All use subject to JSTOR Terms and Conditions
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Front MatterSource: Philosophical Transactions of the Royal Society of London. Series A, Mathematical andPhysical Sciences, Vol. 306, No. 1492, The Earth's Core: Its Structure, Evolution and MagneticField (Aug. 20, 1982), pp. 1-3Published by: The Royal SocietyStable URL: http://www.jstor.org/stable/37176 .

Accessed: 08/05/2014 02:04

Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at .http://www.jstor.org/page/info/about/policies/terms.jsp

.JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range ofcontent in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new formsof scholarship. For more information about JSTOR, please contact [email protected].

.

The Royal Society is collaborating with JSTOR to digitize, preserve and extend access to PhilosophicalTransactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

http://www.jstor.org

This content downloaded from 169.229.32.137 on Thu, 8 May 2014 02:04:10 AMAll use subject to JSTOR Terms and Conditions

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VOLUME ;:306 PAGES 1289 NUMBERS 1492

-20'August 1982

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PROCEEDINGS AND PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY

Notice to contributors The Royal Society welcomes suitable communications for publication in its scientific journals: papers estimated to occupy up to 24 printed pages are con- sidered for the Proceedings and longer papers and those with numerous or large illustrations for the Philosophical Transactions.

Detailed advice on the preparation of papers to be submitted to the Society is given in a leaflet available from the Executive Secretary, The Royal Society, 6 Carlton House Terrace, London SWIY 5AG. The 'Instructions to authors' are also printed in every fifth volume of the Proceedings A and B (volume numbers ending in o or 5). The basic requirements are: a paper should be as concise as its scientific content allows and grammatically correct; standard nomenclature, units and symbols should be used; the text (including the abstract, the list of references and figure descriptions) should be in double spaced typing on one side of the paper. A leaflet giving detailed advice on the preparation of illustra- tions is available from the Executive Secretary; diagrams should be expertly drawn at about twice the proposed final size, preferably with lettering in the correct style but if this is not possible the lettering should be inserted not on the original drawings but on a set of copies; where photographs are essential the layout should be designed to give the most effective presentation.

The initial submission of a paper must be through a Fellow or Foreign Member of the Society, but subsequent correspondence will be conducted direct with the author. The latest lists of Fellows and Foreign Members are to be found in the current edition of the Year Book of the Royal Society. A copy of 'Notes for the guidance of Fellows communicating papers' is available from the Executive Secretary. In the event of any difficulty, an author is invited to seek the assistance of the Executive Secretary.

No page charge is levied, and the first 50 offprints of a paper are supplied to the author gratis.

The Editors particularly welcome short communications to Proceedings; as far as possible they will be given expeditious treatment both in consideration and in printing, and this will be facilitated if a paper is submitted with a firm recommendation by a Fellow.

Associate Editors: series A, Mathematical and Physical Sciences (For Standing Orders see current Year Book.)

Professor E. A. Ash Professor D. S. Jones Professor J. M. Thomas Professor F. F. Bonsall Professor T. W. B. Kibble Dr D. W. Turner Professor G. Gee Professor M. S. Longuet-Higgins Professor R. Weck Professor A. Hewish Professor G. W. Series Professor A. J. C. Wilson

Copyright ? i982 The Royal Society and the authors of individual papers.

It is the policy of the Royal Society not to charge any royalty for the production of a single copy of any one article made for private study or research. Requests for the copying or reprinting of any article for any other purpose should be sent to the Royal Society.

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PhIl. Trans. R. Soc. Lond. A, volume 306 Frontispiece

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Phil. Trans. R. Soc. Lond. A 306, 1-289 (1982) [ 1 ] Printed in Great Britain

THE EARTH'S CORE: ITS STRUCTURE, EVOLUTION AND MAGNETIC FIELD

A DISCUSSION ORGANIZED AND EDITED BY

S. K. RUNCORN, F.R.S., K. M. CREER AND J. A. JACOBS

(Discussion held 27 and 28 January 1982 - Typescripts received 15 March 1982)

[Frontispiece]

CONTENTS PAGE

S. R. C. MALIN

Sesquicentenary of Gauss's first measurement of the absolute value of magnetic intensity 5

J. A. JACOBS Introductory remarks 9

THE CONSTITUTION OF THE CORE B. A. BOLT

The constitution of the core: seismological evidence 11

0. L. ANDERSON

The Earth's core and the phase diagram of iron 21

T. J. AHRENS Constraints on core composition from shock-wave data 37

C. J. ALLEGRE, B. DUPRE' AND 0. BREVART

Chemical aspects of the formation of the core 49

R. A. W. HADDON

Evidence for inhb mogeneities near the core-mantle boundary 61 Discussion: R. H1DE, F.R.S., M. F. OSMASTON 69

THE GEOMAGNETIC FIELD: SECULAR VARIATION AND REVERSALS

D. R. BARRACLOUGH

Historical observations of the geomagnetic field 71

MARY KOVACHEVA

Archaeomagnetic investigations of geomagnetic secular variations 79 Discussion: R. HIDE, F.R.S. 85

K. M. CREER AND P. TUCHOLKA

Secular variation as recorded in lake sediments: a discussion of North American and European results 87

Vol. 306. A 1492 I [Published 20 August 1982

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2 CONTENTS

PAGE R. THOMPSON

A comparison of geomagnetic secular variation as recorded by historical, archaeomagnetic and palaeomagnetic measurements 103

B. M. CLEMENT, D. V. KENT AND N. D. OPDYKE

Brunhes-Matuyama polarity transition in three deep-sea sediment cores 113

J. C. LIDDICOAT Gauss-Matuyama polarity transition 121

W. LOWRIE A revised magnetic polarity timescale for the Cretaceous and Cainozoic 129

J. E. T. CHANNELL, J. G. OGG AND W. LOWRIE Geomagnetic polarity in the early Cretaceous and Jurassic 137

K. A. HOFFMAN The testing of geomagnetic reversal models: recent developments 147

Discussion: R. HIDE, F.R.S. 158

K. L. VEROSUB

Geomagnetic excursions: a critical assessment of the evidence as recorded in sediments of the Brunhes Epoch 161

F. HELLER AND N.. PETERSEN

The Laschamp excursion 169 Discussion: C. LAJ 177

C. G. A. HARRISON AND H. Mt. CARLE

Modelling the core magnetic field of the Earth 179 Discussion: K. M. CREER 190

R. E. DODSON Normal vector models of the geomagnetic secular variation during late Tertiary time 193

Discussion: F. J. LOWES 201

C. E. BARTON

Spectral analysis of palaeomagnetic time series and the geomagnetic spectrum 203 Discussion: F. J. LOWES 209

M. 0. MCWILLIAMS, R. T. HOLCOMB AND D. E. CHAMPION Geomagnetic secular variation from 14C-dated lava flows on Hawaii and the

question of the Pacific non-dipole low 211

Discussion: R. HIDE, F.R.S. 221

GEOPHYSICAL INTERPRETATIONS R. HIDE, F.R.S.

On the role of rotation in the generation of magnetic fields by fluid motions 223

KATHRYN A. WHALER

Geomagnetic secular variation and fluid motion at the core surface 235

Discussion: F. J. LowEs 246

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CONTENTS 3

PAGE

D. GUBBINS

Finding core motions from magnetic observations 247

Discussion: R. HIDE, F.R.S., M. F. OSMASTON 254

F. KRAUSE

Progress in dynamo theory: kinematic and dynamic models 255

S. K. RUNCORN, F.R.S. The role of the core in irregular fluctuations of the Earth's rotation and the excitation of the Chandler wobble 261

Discussion: K. LAMBECK, D. E. WINCH 268

T. MADDEN AND J.-L. LE MOUEL

The recent secular variation and the motions at the core surface 271

S. R. C. MALIN AND R. HIDE, F.R.S. Bumps on the core-mantle boundary: geomagnetic and gravitational evidence revisited 281

Discussion: K. LAMBECK, H. K. MOFFATT 987

I1-2

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