摘要:

The scientific history of the auroral green line dates from 1968, when Ångstrøm identified this emission in the auroral spectrum. The studies that led to the identification of the1D2‐1S0atomic oxygen transition responsible for this emission are described, and our present knowledge about direct and indirect excitation processes of the O(1S) atom is reviewed. Although the excitation of the green line still presents some problems, the current evidence indicates that indirect excitation is most important in normal aurora and that energy transfer from N2(A) molecules is the dominant mechanism. In this context, the pioneering experiments of Vegard are clearly of major importance because they showed for the first time the close relationship that exists between the nitrogen bands and the green line—an observation that led Vegard to formulate the N2(A) energy transfer pr

ISSN:0002-8606    

DOI:10.1029/88EO01015

年代:1988

数据来源: WILEY

摘要:

The AGU Hydrology Section Executive Committee Meeting was called to order at about 4 p.m. on May 16, 1988, by Marshall Moss. In attendance were George Pinder, Jim Mercer, Peter Eagleson, Don Nielsen, Karen Prestegaard, Helen Joyce Peters, Stephen Burges, Jurate Landwehr, Ken Bancala, Dennis Lettenmaier, Eric Wood, John Schaake, Henny Colenbrander, Ivan Johnson , David Brookshire, George Leavesley, Francis Hall, and Ken Potter.

ISSN:0002-8606    

DOI:10.1029/88EO01017

年代:1988

数据来源: WILEY

摘要:

What would you call the next generation of radar for severe weather prediction? NEXRAD, of course. A prototype for the new system was recently completed in Norman, Okla., and by the early 1990s up to 195 stations around the United States will be tracking dangerous weather and sending faster, more accurate, and more detailed warnings to the public.NEXRAD is being built for the Departments of Commerce, Transportation, and Defense by the Unisys Corporation under a $450 million contract signed in December 1987. Th e system will be used by the National Weather Service, the Federal Aviation Administration (FAA), and the U.S. Air Force and Navy. The NEXRAD radar tower in Norman is expected to be operational in October.

ISSN:0002-8606    

DOI:10.1029/88EO01019

年代:1988

数据来源: WILEY

ISSN:0002-8606    

DOI:10.1029/EO069i029p00729-03

年代:1988

数据来源: WILEY

摘要:

The AGU Council met May 17 at the Spring Meeting in Baltimore. All sections were fully represented by their elected officers or duly authorized proxies. Most of the newly elected officers were also in attendance. They had participated in the Full‐Day Leadership Conference on Sunday preceding the AGU Spring Meeting, where they learned about the organization and operations of the Union and the aims of the major committees and programs. They also discussed section and Union ojectives for the coming biennium. The discussions at the Leadership Conference help set the stage for the activities of the Planning Committee, who will submit their plan to Council in Decembe

ISSN:0002-8606    

DOI:10.1029/88EO01025

年代:1988

数据来源: WILEY

ISSN:0002-8606    

DOI:10.1029/EO069i029p00734-02

年代:1988

数据来源: WILEY