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Featured researches published by Andrew J. Dombard.


Journal of Geophysical Research | 2006

Sulfur's impact on core evolution and magnetic field generation on Ganymede

Steven A. Hauck; Jonathan M. Aurnou; Andrew J. Dombard

[1] Analysis of the melting relationships of potential core forming materials in Ganymede indicate that fluid motions, a requirement for a dynamo origin for the satellite’s magnetic field, may be driven, in part, either by iron (Fe) ‘‘snow’’ forming below the coremantle boundary or solid iron sulfide (FeS) floating upward from the deep core. Eutectic melting temperatures and eutectic sulfur contents in the binary Fe-FeS system decrease with increasing pressure within the interval of core pressures on Ganymede (<14 GPa). Comparison of melting temperatures to adiabatic temperature gradients in the core suggests that solid iron is thermodynamically stable at shallow levels for bulk core compositions more iron-rich than eutectic (i.e., <21 wt % S). Calculations based on highpressure solid-liquid phase relationships in the Fe-FeS system indicate that iron snow or floatation of solid iron sulfide, depending on whether the core composition is more or less iron-rich than eutectic, is an inevitable consequence of cooling Ganymede’s core. These results are robust over a wide range of plausible three-layer internal structures and thermal evolution scenarios. For precipitation regimes that include Fe-snow, we present scaling arguments that give typical Rossby and magnetic Reynolds numbers consistent with dynamo action occurring in Ganymede’s core. Furthermore, by applying recently derived scaling relationships relating magnetic field strength to buoyancy flux, we obtain estimates of surface magnetic field strength comparable with observed values.


Nature | 2007

Planetary science: cracks under stress.

Andrew J. Dombard

Two modelling studies provide complementary descriptions of how gravitational forces might help to form the plumes of water vapour that spout from cracks in Enceladus, one of Saturns icy moons.


Nature | 2016

Planetary science: Pluto's polygons explained

Andrew J. Dombard; Sean O'Hara

The Sputnik Planum basin of Pluto contains a sheet of nitrogen ice, the surface of which is divided into irregular polygons tens of kilometres across. Two studies reveal that vigorous convection causes these polygons. See Letters p.79 & 82


Archive | 2003

Why are There So Few Magnetic Anomalies in Martian Lowlands and Basins

Sean C. Solomon; Oded Aharonson; W. Bruce Banerdt; Andrew J. Dombard; Herbert V. Frey; Matthew P. Golombek; Steven A. Hauck; James W. Head; C. L. Johnson; Patrick J. McGovern


Archive | 2009

The Influence of Local Thermal Anomalies on Large Impact Basin Relaxation

Jeffrey A. Balcerski; Steven A. Hauck; Andrew J. Dombard; Elizabeth P. Turtle


Archive | 2002

Insights into the Earliest History of Mars: A New Synthesis

Sean C. Solomon; Oded Aharonson; Jonathan M. Aurnou; W. Bruce Banerdt; Michael H. Carr; Andrew J. Dombard; Henry V. Frey; Matthew P. Golombek; Steven A. Hauck; James W. Head


Archive | 2001

Internal Structure and Mechanisms of Core Convection on Ganymede

Scott Hauck; Andrew J. Dombard; Sean C. Solomon; Jonathan M. Aurnou


Archive | 2011

Preservation of Superisostasy in Large Lunar Basins

Jeffrey A. Balcerski; Steven A. Hauck; Andrew J. Dombard; Dept


Nature | 2007

Planetary scienceCracks under stress

Andrew J. Dombard


Archive | 2006

Evidence From Gravity and Topography That Actively Forming Coronae in the Beta-Atla- Themis Region of Venus are Underlain by Transient Mantle Plumes

Andrew J. Dombard; C. L. Johnson; Mark A. Richards; Sean C. Solomon

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Steven A. Hauck

Carnegie Institution for Science

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Jeffrey A. Balcerski

Case Western Reserve University

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W. Bruce Banerdt

California Institute of Technology

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Oded Aharonson

Weizmann Institute of Science

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C. L. Johnson

University of British Columbia

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Elizabeth P. Turtle

Johns Hopkins University Applied Physics Laboratory

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Herbert V. Frey

Goddard Space Flight Center

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