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1. |
The spacecraft “Fleet” to Comet Halley: An introduction |
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Eos, Transactions American Geophysical Union,
Volume 66,
Issue 4,
1985,
Page 33-33
Bruce T. Tsurutani,
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PDF (2614KB)
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摘要:
Comets are believed to have been formed at the same time that the sun and planets were created out of a rotating disc of gas and dust some 4.5 billion years ago. It is thought that they presently exist in the Oort cloud, a region of space beyond the outer planets [Oort, 1950] that extends to 105Astronomical Units (AU) from the sun (1 AU is the distance from the sun to the earth, or 1.5×108km). Calculations indicate that there are ∼1012comets, of which a half dozen per year get injected into the solar system by the gravitational forces of passing stars. Comets may be the most pristine, least processed solar nebula material available to study within our solar syst
ISSN:0002-8606
DOI:10.1029/EO066i004p00033-01
年代:1985
数据来源: WILEY
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2. |
Michael O'Hara Wins VGP Award |
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Eos, Transactions American Geophysical Union,
Volume 66,
Issue 4,
1985,
Page 34-34
David Walker,
Brent Dalrymple,
Robin Brett,
Michael O'Hara,
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PDF (1294KB)
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摘要:
To many, the study of volcanism is a window into the condition of the mantle. Subtle (and not so subtle) variations in time and space of basalt chemistry may simply reflect variations in the mantle source regions of basalt. To some, however, it is not so simple.Our awardee today, Michael J. O'Hara, has been an early leader in exploring the “information content” of basaltic volcanism by using the methods of experimental petrology and geochemical variation. Significantly, he was among the earliest to reject the notion that basalts tell us very much directly about the mantle. Mike has not dismissed basalts as being devoid of information about the evolution of the earth. Rather, he has presented us with a comprehensive view of basalts as agents in a complex crust‐building process. Gone is the easy connection between a basalt and its source region. Instead, this connection is replaced by a melodrama of geochemical adventures leading to eruption or intrusion within the crust. Indeed, there is now more and more field and petrographic evidence for some of the many complicating activities to which Mike has drawn our attention. Mike has shown that the processes responsible for crust building are interesting and important in their own right, even though they may cloud some interpretations of the significance of ba
ISSN:0002-8606
DOI:10.1029/EO066i004p00034-01
年代:1985
数据来源: WILEY
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3. |
STORM Program |
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Eos, Transactions American Geophysical Union,
Volume 66,
Issue 4,
1985,
Page 36-36
David W. Robb,
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PDF (155KB)
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摘要:
The first field experiment of the National STORM (Stormscale Operational and Research Meteorology) Program is scheduled to get underway this spring in southern Oklahoma. Called PRE‐STORM (for Preliminary Regional Experiment for STORM‐Central), the investigation will help scientists to evaluate new meteorological forecasting equipment and techniques and to gather a preliminary data base for STORM‐Central, the first multiscale field experiment proposed for
ISSN:0002-8606
DOI:10.1029/EO066i004p00036-01
年代:1985
数据来源: WILEY
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