|
1. |
NASA Mars Project: Evolution of climate and atmosphere |
|
Eos, Transactions American Geophysical Union,
Volume 69,
Issue 47,
1988,
Page 1585-1596
Stephen M. Clifford,
Ronald Greeley,
Robert M. Haberle,
Preview
|
PDF (3698KB)
|
|
摘要:
Mars has long fascinated scientists and the public. As a result, it has been the target of a number of ambitious spacecraft missions, the most recent being that of Vikings 1 and 2 in 1976. Following an initial period of intensive study, it became clear by the late 1970s that the Viking data could still yield important clues about the nature and evolution of Mars. In recognition of this potential, NASA established the Mars Data Analysis Program (MDAP) in 1979 to coordinate the funding and direction of Mars research. The first major investigation supported by MDAP was a focused 3‐year study project on the origin and evolution of martian volatiles. The project, entitled “Mars: Evolution of its Climate and Atmosphere” (MECA), was initiated in 1984 under the direction of the Lunar and Planetary Institute, Houston
ISSN:0002-8606
DOI:10.1029/88EO01198
年代:1988
数据来源: WILEY
|
2. |
NASA Space Physics Program |
|
Eos, Transactions American Geophysical Union,
Volume 69,
Issue 47,
1988,
Page 1586-1586
Mary Mellott,
Preview
|
PDF (207KB)
|
|
摘要:
The selection of proposals to be funded under NASA's Space Physics Division Research and Analysis (R&A) Program in fiscal year (FY) 1989 has been completed, and the results of this selection are summarized here.These proposals were submitted in response to NASA Research Announcement (NRA) NRA‐88‐OSSA‐02, issued in February of this year. The NRA covered most but not all of the Division's R&A programs, as can be seen in Table 1. Basic R&A programs in Heliopsheric Physics, Ionospheric Physics, Magnetospheric Physics, and Solar Physics were reviewed, along with the Cosmic Physics Theory and Data Analysis. Not included in this review were the experimental portion of the Cosmic Physics program, the Suborbital Program (sounding rockets and balloons), and the Solar‐Terrestrial Theory
ISSN:0002-8606
DOI:10.1029/88EO01199
年代:1988
数据来源: WILEY
|
3. |
Hydrothermal activity on the Gorda Ridge |
|
Eos, Transactions American Geophysical Union,
Volume 69,
Issue 47,
1988,
Page 1588-1588
P. Rona,
R. Denlinger,
M. Fisk,
K. Howard,
K. Klitgord,
J. McClain,
G. McMurray,
G. Taghon,
J. Wiltshire,
Preview
|
PDF (165KB)
|
|
摘要:
Were port our discovery of the first hydrothermal field on the northern Gorda Ridge located only 200 km off southern Oregon within the proclaimed U.S. Exclusive Economic Zone (Figure 1). The discovery was made with the U.S. Navy Deep Submergence VehicleSea Cliffand her support ship the DSVSSLaney Choueston a dive series between September 15 and 30, 1988.The northern Gorda Ridge is characterized by an intermediate spreading rate (2.8 cm/yr half‐rate), although the high relief of the sediment‐free rift valley a n d distribution of volcanic rock types resemble the slow‐spreading Mid‐Atlantic Ridge more than other intermediate‐ to fast‐spreading centers in the Pacific. The hydrotheral field extends several hundred meters along the east wall at water depths between 2700 and 2800 m, about 300 m above the floor of the
ISSN:0002-8606
DOI:10.1029/88EO01202
年代:1988
数据来源: WILEY
|
4. |
First SEDI Symposium |
|
Eos, Transactions American Geophysical Union,
Volume 69,
Issue 47,
1988,
Page 1593-1594
Edward R. Benton,
Joseph C. Cain,
David E. Loper,
Durk Doornbos,
Preview
|
PDF (177KB)
|
|
摘要:
How should the seismic irregularities observed in the lowermost 100–200 km of the mantle (the D″ layer) be partitioned between thermal and chemical heterogeneity, anisotropy, and core‐mantle boundary (CMB) topography? How smooth is the core‐mantle boundary? Do mantle convection and the thickness of D″ regulate the core geodynamo? How large is the outward temperature fall across the D″ layer? What is the temperature within the core? At what depths, or range of depths, do the vigorous upwellings and downwellings, demanded by dynamo action, occur within the outer core? Are seismically excited internal oscillations of the outer core observationally detectable in surface superconducting gravimeter records?These constitute an illustrative sample of the questions discussed by almost 200 scientists at the first Study of the Earth's Deep Interior (SEDI) symposium entitled “Structure and Dynamics of the Core and Adjacent Mantle,” held on the Costa Brava of Spain, at Blanes from June 23–25, 1988, in conjunction with the 17th International Conference of the Committee on Mathematical Geophysics. SEDI is a new committee of the International Union of Geodesy and Geophysics, created at the Vancouver General Assembly in August 1987. This symposium and the SEDI secretariat have been sponsored by the National Science Foundation with help from the National Aeronautics and Space Administration. The following is a report of the SEDI symposium, which consisted of 13 oral presentations, 48 posters, and 5 open discussion periods during which the posters and general issu
ISSN:0002-8606
DOI:10.1029/88EO01209
年代:1988
数据来源: WILEY
|
5. |
Solar radiative output variations |
|
Eos, Transactions American Geophysical Union,
Volume 69,
Issue 47,
1988,
Page 1598-1598
Peter V. Foukal,
Preview
|
PDF (322KB)
|
|
摘要:
A National Science Foundation sponsored workshop on Solar Radiative Output Variations was held at the National Center for Atmospheric Research, Boulder, Colo., November 9–11, 1987. The aims were to review the status of this topic, identify research areas most likely to prove fruitful in the next 5–10 years, and make recommendations on desirable initiatives, particularly in ground‐based observations and theory.Fifty three scientists participated in 2½ days of review and contributed papers, and in the organizational meetings of six working groups. The sessions covered subjects ranging from “what atmospheric and climate physicists need to know about the solar radiative output and its variations,” through direct and proxy observations of EUV, UV, and total irradiance variability of the Sun and similar stars, to the physical interpretation of such variations in the present and di
ISSN:0002-8606
DOI:10.1029/88EO01201
年代:1988
数据来源: WILEY
|
6. |
Geophysical events |
|
Eos, Transactions American Geophysical Union,
Volume 69,
Issue 47,
1988,
Page 1599-1599
Anonymous,
Preview
|
PDF (300KB)
|
|
摘要:
This is a summary ofSEAN Bulletin, 13(9), September 30, 1988, a publication of the Smithsonian Institution's Scientific Event Alert Network. The complete bulletin is available in the microfiche edition ofEosas a microfiche supplement or as a paper reprint. For the microfiche, order document E88‐013 at $2.50 (U.S.) by writing to AGU Orders, 2000 Florida Avenue, N.W., Washington, DC 20009 or by calling toll free on 800‐424‐2488. For the paper reprint, orderSEAN Bulletin(giving volume and issue numbers and issue date) through the same address; the price is $3.50 for one copy of each issue number for those who do not have a deposit account, $2 for those who do; additional copies of each issue number are $1. Subscriptions toSEAN Bulletinare also available from AGU‐Orders; the price is $18 for 12 monthly issues mailed to a U.S. address, $28 if mailed elsewhere, and must be prepaid.SEAN Bulletinis available on Kosmos. Type CHECK SEAN on Part A of
ISSN:0002-8606
DOI:10.1029/EO069i047p01599-01
年代:1988
数据来源: WILEY
|
|