Aurorae and other Atmospheric Phenomena
Regular observers of the night sky are among those most familiar with the various short-lived cloud and optical phenomena to be seen in the Earth’s atmosphere. Amateur astronomers keeping a weather eye on the sky before nightfall to gauge whether a clear night is likely are often in a position to record atmospheric halos or parhelia (“sundogs”) produced by the refraction of sunlight by ice crystals in advancing veils of cirrus cloud, for example, or unusual formations such as lenticular clouds (Greenler, 1989; Minnaert, 1954). Many amateur observers marvelled at the succession of purple twilights in 1991 and 1992 which resulted from the injection of volcanic material into the stratosphere by the eruption of Mount Pinatubo.
KeywordsSolar Wind Solar Cycle Solar Flare Geomagnetic Storm Auroral Oval
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References and Resources
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- Aurora Web Site: http://www.geo.mtu.edu/weather/aurora
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