摘要:

By combining 19th‐century ideas with 20th‐century computing power, geodesists with National Oceanic and Atmospheric Administration's National Geodetic Survey have succeeded in solving 1.8 million equations (observations) with 900,000 unknowns. This is one of the largest (if not the largest) systems of equations that have been solved simultaneously. This feat results in a geodetic network for North America that is one of the best of its kind in the world. The mammoth project took about 350 staff years of effort over a period of 12 ye

ISSN:0002-8606    

DOI:10.1029/EO068i023p00569

年代:1987

数据来源: WILEY

摘要:

On the occasion of the 75th anniversary of the founding of the Hawaiian Volcano Observatory (HVO), the Smithsonian Institution (Washington, D.C.) has reprinted an historic, hard‐to‐find reference on volcanic activity in Hawaii and around the world that was published at the observatory from 1925 to 1955.The Volcano Lettercontains the definitive reports of many Hawaiian eruptions, such as activity in Halemaumau at Kilauea from the late 1920s to 1934 and the Mauna Loa eruptions of 1935 and the 1940s; accounts of the development of volcano‐monitoring techniques at HVO; scholarly reports on historic activity at volcanos in Hawaii and around the world; and reports of seismicity in Hawaii and else

ISSN:0002-8606    

DOI:10.1029/EO068i023p00570-01

年代:1987

数据来源: WILEY

摘要:

New evidence suggests that Pluto may have a more substantial atmosphere than the tenuous methane atmosphere that had been hinted at by earlier data. The new findings are based on results from the Infrared Astronomical Satellite (IRAS) and on extensive observations taken through telescopes on Earth over the past 3 years.Edward F. Tedesco, Glenn J. Veeder, and R. Scott Dunbar of the Jet Propulsion Laboratory (Pasadena, Calif.) of the National Aeronautics and Space Administration and Larry A. Lebofsky of the University of Arizona (Tucson) reported their results in the May 14, 1987, issue ofNature. They said that Pluto's thermal characteristics, as measured twice in 1983 by IRAS, support the suggestion that Pluto has a substantial methane atmosphere.

ISSN:0002-8606    

DOI:10.1029/EO068i023p00572-01

年代:1987

数据来源: WILEY