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1. |
The Earth's magnetic field: Which geometry? |
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Eos, Transactions American Geophysical Union,
Volume 73,
Issue 32,
1992,
Page 337-342
Vincent Courtillot,
Jean‐Pierre Valet,
Gauthier Hulot,
Jean‐Louis Le Mouël,
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摘要:
Were it not for the presence of a solar wind, the intrinsic magnetic field of the Earth—if observed from far enough out in space—would appear to be almost perfectly dipolar, with the axis of the dipole presently tilted by some 10° with respect to the rotation axis. At the Earth's surface, the axial dipolar term is dominant, which serves among other uses as a basis for both orientation with a compass and plate‐tectonic applications of paleomagnetism. One can ask whether this dipolar dominance would hold were the field observed from just above its source at the core‐mantle boundary. The answer is that indeed it does (Figure 1), although of course the dipolar part is reduced in amplitude relative to the higher‐order (shorter wavelength) terms. These higher‐order terms are compatible with a flat, white‐noise‐like, power spectrum. This implies that there are similar amounts of energy stored in the various harmonic terms (see, for example,Constable and Parker[1988]), although a “pink” spectrum (that is, slightly more power at the longer wavelengths) is as plausible [Hulot et al.,1992]. Terms beyond degree and order 13 (that is, wavelengths shorter than 1500 km) are contaminated by crustal and lithospheric (that is, surf
ISSN:0002-8606
DOI:10.1029/91EO00260
年代:1992
数据来源: WILEY
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2. |
Meeting on Earth System History |
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Eos, Transactions American Geophysical Union,
Volume 73,
Issue 32,
1992,
Page 338-339
Eric J. Barron,
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摘要:
The geologic record preserves the integrated response of the Earth system to many perturbations. The study of Earth system history provides unique information on natural variability, the coupling of the components of the Earth system, the biosphere response to global change, and the global and regional response to abrupt changes. Earth system history also has the potential to supply case studies of past global change which are essential to assess the response of climate models to altered boundary conditions. For these reasons, Earth system history has become a key element of the U.S. Global Change Research Program (USGCRP).
ISSN:0002-8606
DOI:10.1029/91EO00262
年代:1992
数据来源: WILEY
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3. |
Copyright case a victory for science publishing |
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Eos, Transactions American Geophysical Union,
Volume 73,
Issue 32,
1992,
Page 339-340
Stephen Cole,
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摘要:
An important victory for the financial health and future of scientific journals was won July 23 when Judge Pierre Leval of the Federal District Court in New York handed down his decision on the copyright infringement suit,American Geophysical Union, et al. v. Texaco Inc.Leval ruled that profit‐making companies cannot photocopy copyrighted journal articles without permission and without compensating the copyright holder.The class action suit was brought in 1985 by AGU and six other scientific publishers on behalf of 8500 publishers worldwide who make their titles available for legal copying under licenses granted by the Copyright Clearance Center, Inc. This licensing system was designed in cooperation with major corporations to facilitate compliance with the 1976 Copyright Act. Although more than 200 companies now use the center, some corporations, such as Texaco, have not. The suit was initiated to force compliance with copyright law. The current decision is very important because it establishes legal precedents on the “fair use”
ISSN:0002-8606
DOI:10.1029/91EO00263
年代:1992
数据来源: WILEY
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4. |
Gombosi named JGR‐Space Physics Senior Editor |
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Eos, Transactions American Geophysical Union,
Volume 73,
Issue 32,
1992,
Page 340-340
Susan Bush,
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摘要:
Tamas I. Gombosi, professor of space science and aerospace engineering at the University of Michigan, Ann Arbor, has been appointed senior editor of the Journal of Geophysical Research‐Space Physics. His term will begin August 1 and continue until December 31, 1996.Gombosi's main objective as editor is to keepJGR(blue) the “best space physics journal in the world,” while making it more readable, more interesting, and increasing its circulation. Specifically, he wants to provide the highest‐quality forum for space physics, assure equal access and standards for scientists from all over the world, and provide a forum for new, high‐r
ISSN:0002-8606
DOI:10.1029/91EO00264
年代:1992
数据来源: WILEY
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