描述Maunder auroral beam 11-17-1882.gif	Drawing of passage of "auroral beam" of November 17, 1882
日期	1883年5月
来源	Philosophical Magazine
作者	Rand Capron
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其他版本	English Wikipedia

摘要

Drawing of passage of "auroral beam" of November 17, 1882, by astronomer and aurora expert Rand Capron, Guildown Observatory, Surrey, UK. Also described by prominent British astronomer Edward Walter Maunder. Drawing first published in Philosophical Magazine, May 1883. Reprinted by astronomer Morris K. Jessup in "The Case for the UFO," 1955, p. 32, Citadel Press. Electronic version of Jessup book with illustration online

Maunder in The Observatory journal of the Royal Greenwich Observatory, in June 1883 and April 1916, described the phenomenon as about 30 degrees long, 2-3 degrees wide, with distinct edges and an opaque central portion. It was whitish or whitish-green, about the same color as auroral displays, but much brighter. It moved steadily across the sky from (magnetic) east to west in under 2 minutes. It moved "as the Sun, Moon, stars and planets move but nearly a thousand times as quickly." When first seen it was low down in the E.N.E. and circular or disc-like in shape, but as it moved it turned into "a very elongated ellipse", variously described as "cigar-shaped," "like a torpedo," "a spindle", or a "shuttle." In 1916, Maunder likened it to "just like a Zeppelin."

In 1916, Maunder commented that it was "a celestial object unique in my experience" and "unlike any other celestial object that I have ever seen. The quality of its light, and its occurrence while a great magnetic storm and a bright aurora were in progress, seem to establish its auroral origin. But it differed very widely in appearance from any other aurora that I have ever seen."

The described phenomenon has some similarity in appearance to Upper Tangent arc, frequent in the northern regions, described and studied by meteorologists. Upper Tangent arc is produced by horizontally orientated column-shaped ice crystals reflecting the sunlight (articles in Arbeitskreis Meteore e.V. ). However, the 1882 phenomenon, according to Maunder, moved rapidly across the sky, whereas Upper Tangent arc would remain relatively stationary and can only occur during daytime, since it is created by and is tied to the position of the sun.

许可协议

	本作品在其来源国以及其他著作权期限是作者逝世后70年或以下的国家和地区属于公有领域。 你必须增加美国公有领域标签显示为何这个作品在美国属于公有领域。 请注意少数国家的版权保护期为70年以上：墨西哥为100年，牙买加为95年，哥伦比亚为80年，危地马拉与萨摩亚为75年，而这些国家不实施较短期限法则，因此该图片可能在这些国家不被认为是公有领域。洪都拉斯的版权期限一般为75年，但该国实施较短期限法则。对于在第二次世界大战期间为法国利益战死的法国人（更多信息）、二战期间参与过苏德战争（俄罗斯称之为伟大的卫国战争）的俄罗斯人，以及苏联时期遭到镇压，而死后获得平反的牺牲者（更多信息），这些人的作品版权期限会有所延长。
	本文件已被确认为免除已知的著作权法限制（包括所有相关权利）。

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