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The Voyager 2 Neptune encounter |
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Eos, Transactions American Geophysical Union,
Volume 70,
Issue 43,
1989,
Page 915-921
Bruce T. Tsurutani,
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摘要:
The existence of Neptune was predicted from perturbations observed in the orbital characteristics of the planet Uranus. Two mathematicians, John Couch Adams of England and Jean Joseph Urbain Le Verrier of France, independently predicted its location in 1845 and 1846, respectively. By telescopic sightings from the Berlin Observatory in 1846, Johann Gottfried Galle and Louis Heinrich D'Arrest confirmed Neptune's existence as the eighth planet in the Solar System.Neptune's equatorial diameter is 5 × 105km, similar to Uranus's. It is 30 Astronomical Units (1 AU = 1.5 × 108km) from the sun and has an orbital period of 165 years. Before Voyager 2′s encounter, the planet's rotational rate was believed to be between 17 and 18 hours. The planet's rotational axis is tilted 29° relative to its orbital plane. Neptune radiates 2.8 times more energy than it absorbs from sunlight, a greater energy imbalance than exists for any of the other planets. In addition, its density of 1.64 gm cm−3is greatest among the giant planets. These two extremes may be linked, an indication of an unusual degree of radiogenic heating within N
ISSN:0002-8606
DOI:10.1029/89EO00327
年代:1989
数据来源: WILEY
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DELP Symposium: Tectonics of eastern Asia and western Pacific Continental Margin |
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Eos, Transactions American Geophysical Union,
Volume 70,
Issue 43,
1989,
Page 930-933
Anonymous,
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PDF (603KB)
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摘要:
Eastern Asia and the western Pacific make up a broad region of active plate tectonic interaction. The area is a natural laboratory for studying the processes involved in the origin and evolution of volcanic island arcs, marginal basins, accretionary prisims, oceanic trenches, accreted terranes, ophiolite emplacement, and intracontinental deformation. Many of our working concepts of plate tectonics and intraplate deformation were developed in this region, even though details of the geology and geophysics there must be considered of a reconnaissance nature.During the past few years researchers have accumulated a vast amount of new and detailed information and have developed a better understanding of the processes that have shaped the tectonic elements in this region. To bring together scientists from many disciplines and to present the wide range of new data and ideas that offer a broader perspective on the interrelations of geological, geochemical, geophysical and geodetic studies, the symposium Tectonics of Eastern Asia and Western Pacific Continental Margin was held December 13–16, 1988, at the Tokyo Institute of Technology in Japan, under the auspicies of DELP (Dynamics and Evolution of the Lithosphere Project
ISSN:0002-8606
DOI:10.1029/89EO00328
年代:1989
数据来源: WILEY
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3. |
Abstracts [Fall Meeting, 1989] |
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Eos, Transactions American Geophysical Union,
Volume 70,
Issue 43,
1989,
Page 969-1445
Anonymous,
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PDF (85123KB)
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ISSN:0002-8606
DOI:10.1029/89EO00329
年代:1989
数据来源: WILEY
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