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Personal seismometry now! |
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Eos, Transactions American Geophysical Union,
Volume 65,
Issue 29,
1984,
Page 441-442
E. S. Husebye,
E. Thoresen,
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PDF (550KB)
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摘要:
This article discusses the possibility of personal seismometry (i.e., seismologists having direct access to seismometer installations even from their studies at home). The basic ingredients for this are the general availability of relatively inexpensive microprocessors and easy access to a switched telephone network or equivalent communication systems. Finally, an experiment is described by which seismological data were exchanged between a temporary installation in the United Nations restaurant in Geneva and data center facilities in Oslo, Trondheim, Washington, D.C., and also Canberra.
ISSN:0002-8606
DOI:10.1029/EO065i029p00441
年代:1984
数据来源: WILEY
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2. |
Venus mapper resolution |
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Eos, Transactions American Geophysical Union,
Volume 65,
Issue 29,
1984,
Page 442-442
Tony Reichhardt,
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PDF (154KB)
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摘要:
NASA program managers for the Venus Radar Mapper (VRM) mission have decided to make improvements to the spacecraft's Synthetic Aperture Radar (SAR) system that will increase its mapping resolution by one and a half times over the original design. The changes, including a doubling of the system's range bandwidth, will add a total of about $5 million to a project budgeted at $350 million. VRM is scheduled for launch toward Venus in April 1988 and will map more than 90% of the cloud‐veiled planet's surface during its 8‐month mission.The decision by the VRM program office at NASA headquarters in Washington was based on recommendations from the mission's project office at the Jet Propulsion Laboratory in Pasadena, Calif. When VRM was included as a new start in this year's NASA budget, the stated goals for the mission were to provide a near‐global map of Venus at resolutions better than 1 km, or roughly equivalent to the resolution of the Mariner 9 mission that first revealed the geological richness of the Martian surface. The actual best radar resolution was to have been about 180 m (equivalent to an optical line‐pair resolution of 360 m) attainable for more than half the surface of the planet. VRM will travel an elliptical orbit and so will only be able to map the surface for a fraction of each day. The highest resolutions will come in the equatorial regions when the spacecraft is closest to periapsis and the radar “look angles” are t
ISSN:0002-8606
DOI:10.1029/EO065i029p00442-01
年代:1984
数据来源: WILEY
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3. |
Water in cirrus clouds |
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Eos, Transactions American Geophysical Union,
Volume 65,
Issue 29,
1984,
Page 443-443
Anonymous,
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PDF (288KB)
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摘要:
Meteorologists from the University of Utah have discovered water droplets as cold as −36°C at the base of cirrus clouds, the coldest temperatures at which liquid water has been confirmed in clouds. Because earlier models of radiation transfer in the atmosphere had assumed that the clouds at cirrus‐layer altitudes (6,000–12,000 m) were composed only of ice crystals, the presence of liquid water may affect how these models are constructed.A team led by Kenneth Sassen of Utah's Department of Meteorology used groundbased polarization laser radar (lidar) to detect the water droplets in a cirrus cloud layer approximately 8.2 km above Boulder, Colo., last October. By analyzing the polarization of laser light reflected from cloud particles, the lidar system can identify whether the cloud contains water or ice crystals and can provide information on the type and distribution of ice crystals within the
ISSN:0002-8606
DOI:10.1029/EO065i029p00443-01
年代:1984
数据来源: WILEY
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