The Dancing Lights in the Northern Hemisphere Essay

The Dancing Lights in the Northern Hemisphere Essay

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The Dancing Lights
Auroras have been emitting in our, and other planets’ skies as long as the Solar System has been in motion. In 1619 A.D., Galileo Galilei coined the term "aurora borealis" after Aurora, the Roman goddess of morning. He had the misconception that the auroras he saw were due to sunlight reflecting from the atmosphere. (Angelopoulos, 2008). In 1741, Hiorter and Celsius noted that the polar aurora is accompanied by a disturbance of the magnetic needle. In 1820, Hans Christian Oersted discovered electromagnetism. André-Marie Ampére deduced that magnetism is basically the force between electric currents. In 1851, Samuel Schwabe, a German amateur astronomer, announced the discovery of the 11-year sunspot cycle, and in 1859, Richard Carrington in England observed a violent and rapid eruption near a sunspot; 17 hours later a large magnetic storm began. In 1900-3, Kristian Birkeland experiments with beams of electrons aimed at a magnetized sphere ("terrella") in a vacuum chamber. The electrons hit near the magnetic poles, leading him to propose that the polar aurora is created by electron beams from the Sun. Birkeland also observes magnetic disturbances associated with the aurora, suggesting to him that localized "polar magnetic storms" exist in the auroral zone. In 1958, Eugene Parker (Chicago) proposes the theory of the solar wind. 1981, High resolution images are obtained by Lou Frank's group in Iowa of the entire auroral zone, using the Dynamics Explorer satellite. (Stern & Peredo, 2005) This is the major timeline of how auroras came to be discovered and understood.
Now that the history is covered, I can get down to the nitty gritty of how they are able to appear in the sky. Auroras are caused by the collision of e...


... middle of paper ...


...edaily.com­/releases/2008/07/080724150341.htm
Stern,D., Peredo, M. (2005, December 25) Some Dates in the Exploration of the Magnetosphere. Retrieved from: http://http://www-spof.gsfc.nasa.gov/Education/whchron2.html
Feldstein, Y. I. (2013, November 20) "Some problems concerning the morphology of auroras and magnetic disturbances at high latitudes.” retrieved from:http://en.wikipedia.org/wiki/Aurora_(astronomy)
Weber, E. J., et al. (2013, November 20) “F layer ionization patches in the polar cap.” retrieved from: http://en.wikipedia.org/wiki/Aurora_(astronomy)
Mottelay, F. P., (2013, November 20) Bibliographical History of Electricity and Magnetism, p. 114. retrieved from:http://en.wikipedia.org/wiki/Aurora_(astronomy)
Zell, H. (2013, September 30) About Auroras. retrieved from: http://www.nasa.gov/mission_pages/sunearth/news/gallery/aurora-index.html#.UpJsssSsiSo

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