摘要:

On July 2, 1985, 11:23 UTC (Universal Time Coordinated), the Giotto spacecraft, the European Space Agency (ESA) contribution to the international effort to study Halley's comet in situ, was successfully launched. The spacecraft was placed by an Ariane I launcher into a geostationary transfer orbit (GTO). About 32 h later, on July 3, 1985, 19:24 UTC, during its fourth perigee passage, the built‐in solid propellant transfer propulsion system (TPS) was fired, and Giotto was injected into its escape trajectory from the earth's gravitational influence in order to encounter the comet on March 13, 1986. The TPS firing was so precise that even without further orbit correction maneuvers, Giotto would miss the comet by only 50,000 km. On July 6, 1985, the high‐gain antenna was despun, i.e., set rotating in the opposite sense relative to Giotto's spin so that it maintains a constant direction toward the earth. The spacecraft spin rate was set to the nominal 15 rpm. Experiment switch on is scheduled for September 2, 1985, onward, in time for the Comet Giacobini‐Zinner encounter of the National Aeronautics and Space Administration's International Cometary Explorer space

ISSN:0002-8606    

DOI:10.1029/EO066i033p00593-01

年代:1985

数据来源: WILEY

摘要:

The International Association of Hydrological Sciences (IAHS) is the oldest and foremost of the International nongovernmental organizations dealing with hydrology and water resources. It was established in 1922 and is one of the seven associations that together form the International Union of Geodesy and Geophysics (IUGG). The others are the International Association of Geodesy (IAG), the International Association of Seismology and Physics of the Earth's Interior (IASPEI), the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI), the International Association of Geomagnetism and Aeronomy (IAGA), the International Association of Meteorology and Atmospheric Physics (IAMAP), and the International Association of Physical Sciences of the Ocean (IAPSO).

ISSN:0002-8606    

DOI:10.1029/EO066i033p00594-01

年代:1985

数据来源: WILEY

摘要:

The American Society for Testing and Materials (ASTM) Committee D18 on Soil and Rock develops consensus standards related to exploration for and quantitative availability of groundwater as it occurs in the soil and rock. The 530‐member committee has 20 existing ASTM standards and has, at various stages of development, 25 draft standards that are useful for investigations of available supply, potential and existing pollution, artificial recharge, land subsidence, and other problems related to groundwate

ISSN:0002-8606    

DOI:10.1029/EO066i033p00595-01

年代:1985

数据来源: WILEY

摘要:

A special half‐day session on hydrologic monitoring with microelectronics will be held during the 1985 AGU Fall Meeting, December 9–13, 1985, in San Francisco, Calif. The session will explore hightech data collection systems for surface and subsurface waters as well as precipitation. It will also investigate factors associated with microelectronics in the collection, entry, and analysis of data. Persons interested in presenting a paper should contact Phil Durgin, Redwood Sciences Laboratory, 1700 Bayview Drive, Areata, CA 95521; telephone: 707‐822

ISSN:0002-8606    

DOI:10.1029/EO066i033p00596-01

年代:1985

数据来源: WILEY

摘要:

Eosis carrying biographies and photographs of all candidates for President‐Elect of the Union and for President‐Elect and Secretary of each section. In addition, statements by the candidates for President‐Elect will appear. The material for the Solar‐Planetary Relationships Section appeared in the August 6 issue. The slate of candidates for all offices was carried in the July

ISSN:0002-8606    

DOI:10.1029/EO066i033p00598

年代:1985

数据来源: WILEY