Author
A. T. Price
Bio: A. T. Price is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 6 citations.
Papers
More filters
TL;DR: In this article, it was shown that even if rectification of current in the mantle does occur, it is most unlikely that magnetic storms or other transient variations have any lasting effect on the earth's main field.
Abstract: An examination is made of J. S. Chatterjee's recent suggestion that the earth's magnetic field has been gradually built up by magnetic storms which induce unidirectional current in the highly conducting core because the semiconducting mantle acts as a rectifier. It is shown that, even if rectification of current in the mantle does occur, it is most unlikely that magnetic storms or other transient variations have any lasting effect on the earth's main field. Some comments are made on Chatterjee's arguments and on a note by T. Rikitake.
6 citations
Cited by
More filters
TL;DR: In this article, it is argued that planetary dynamos are almost certainly maintained by convection (compositional and/or thermal) in the deep interiors of all planets and most satellites, either in the form of an Fe alloy with a low eutectic temperature (e.g. Fe-S-O in terrestrial bodies and satellites) or by the occupation of conduction states in fluid hydrogen or "ice" (H2O-NH3-CH4) in giant planets.
Abstract: As a consequence of the smallness of the electronic fine structure constant, the characteristic time scale for the free diffusive decay of a magnetic field in a planetary core is much less than the age of the Solar System, but the characteristic time scale for thermal diffusion is greater than the age of the Solar System. Consequently, primordial fields and permanent magnetism are small and the only means of providing a substantial planetary magnetic field is the dynamo process. This requires a large region which is fluid, electrically conducting and maintained in a non-uniform motion that includes a substantial RMS vertical component. The attributes of fluidity and conductivity are readily provided in the deep interiors of all planets and most satellites, either in the form of an Fe alloy with a low eutectic temperature (e.g. Fe-S-O in terrestrial bodies and satellites) or by the occupation of conduction states in fluid hydrogen or 'ice' (H2O-NH3-CH4) in giant planets. It is argued that planetary dynamos are almost certainly maintained by convection (compositional and/or thermal).
263 citations
01 Mar 1963
TL;DR: Knowledge of geomagnetism and its effects was recently augmented during the IGY; when added to what is known of stellar fields, interplanetary fields, and meteoric magnetism, and combined with magnetic theory, this knowledge not only suggests that much may be learned of our neighbors in space by making an early determination of their magnetic fields, but also provides a foundation for many inferences and rough estimates on the magnetic fields of other solar-system bodies as discussed by the authors.
Abstract: Knowledge of geomagnetism and its effects was recently much augmented during the IGY; when added to what is known of stellar fields, interplanetary fields, and meteoric magnetism, and combined with magnetic theory, this knowledge not only suggests that much may be learned of our neighbors in space by making an early determination of their magnetic fields, but also provides a foundation for many inferences and rough estimates on the magnetic fields of other solar-system bodies. Present estimates range from 660 cgs for Jupiter to 0.004 for the smaller satellites and the planetoids.
13 citations
TL;DR: In this article, a spherically symmetric model of the electrical conductivity of a radially inhomogeneous Earth has been proposed to solve the inverse problem of electric conductivity.
Abstract: A procedure is suggested of a more effective and faster computation of the impedance, the transfer function and amplitudes of the induced field in a spherically symmetric model of the electrical conductivity. The existing induction data have been supplemented by about 80 new values derived from the analysis of daily means. The fit of the existing 1-D models of the electrical conductivity of the mantle to the set of induction data is investigated. The characteristic equation for the free electromagnetic oscillations of a radially inhomogeneous Earth is derived and its possible importance in solving the inverse problem of electric conductivity is pointed out.
11 citations
TL;DR: Satellite observations and magnetic theory used to describe the planetary magnetic fields and their effects on solar system bodies was used in this paper, where the effects of magnetic fields on the solar system were investigated.
Abstract: Satellite observations and magnetic theory used to describe the planetary magnetic fields and their effects on solar system bodies
8 citations