- 行业: Weather
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
An oval-shaped distribution of the aurora. The oval is asymmetrical, but generally around the region of the Arctic and Antarctic. The oval increases in intensity and size when auroral activity is more intense.
Industry:Weather
A form of the aurora consisting of rays or shafts of luminosity aligned in the direction of the geomagnetic field. It can consist of a single ray, a small bundle of rays, or many scattered rays.
Industry:Weather
An approximately circular region around the two geomagnetic poles within which there is a maximum of auroral activity. It lies about ten to fifteen degrees of geomagnetic latitudes from the geomagnetic poles. The auroral zone broadens and extends equatorward during intense auroral displays. See aurora.
Industry:Weather
Aurora that give an appearance of looking at curtains or drapery as viewed from below.
Industry:Weather
Characterized by more or less continuous lower border. They appear like a ribbon or sheet of luminosity, inclined in the direction of the magnetic field. They may be homogeneous, rayed, or striated, and can be single or multiple.
Industry:Weather
In any fairly complex rayed form, viewed in the direction of the magnetic lines of force, rays that appear to converge, forming a fan or corona.
Industry:Weather
A special class of bandlike forms. The arc appears as a simple, slightly curving arch. Arcs are usually quiet and not bright.
Industry:Weather
The ice formed when water from a spring or stream emerges and freezes on top of previously formed ice.
Industry:Weather
