Wolf, Johann Rudolf
Published: August 25, 2008, 1:33 pm
Updated: August 25, 2008, 1:33 pm
This article has been reviewed by the following Topic Editor:
Peter Saundry
Johann Rudolf Wolf.
Johann Rudolf Wolf (1816-1893), as a Swiss astronomer and astronomical historian, he is noted for his pioneering understanding of sunspot activity. Extending the work of Schwabe's discovery of the sunspot cycle, he amassed all available data on sunspot activity as far back as 1610 and calculated a period for the cycle of 11.1 years. He devised a system of gauging solar activity by counting sunspots and sunspot groups, which are known as Wolf's sunspot numbers (1849). This system is still in use for studying solar activity by counting sunspots and sunspot groups. Wolf was one of four people to independently, and more or less simultaneously, notice the coincidence between the 11-year sunspot cycle and the cycle of geomagnetic activity (1852).
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Citation
Cutler J. Cleveland (Lead Author);Peter Saundry (Topic Editor) "Wolf, Johann Rudolf". In: Encyclopedia of Earth. Eds. Cutler J. Cleveland (Washington, D.C.: Environmental Information Coalition, National Council for Science and the Environment). [First published in the Encyclopedia of Earth August 25, 2008; Last revised Date August 25, 2008; Retrieved May 25, 2013 <http://www.eoearth.org/article/Wolf,_Johann_Rudolf>
The Author
Cutler J. Cleveland is Professor of Earth and Environment at Boston University, where he also is on the faculty of the Center for Energy and Environmental Studies. Professor Cleveland is Editor-in-Chief of the Encyclopedia of Energy (Elsevier, 2004), winner of an American Library Association award, the Dictionary of Energy (Elsevier, 2005), Handbook of Energy (Elsevier, forthcoming), and is the Founding Editor-in-Chief of the Encyclopedia of Earth. He is the recipient of the Adelma ... (Full Bio)
Johann Rudolf Wolf.
Johann Rudolf Wolf (1816-1893), as a Swiss astronomer and astronomical historian, he is noted for his pioneering understanding of sunspot activity. Extending the work of Schwabe's discovery of the sunspot cycle, he amassed all available data on sunspot activity as far back as 1610 and calculated a period for the cycle of 11.1 years. He devised a system of gauging solar activity by counting sunspots and sunspot groups, which are known as Wolf's sunspot numbers (1849). This system is still in use for studying solar activity by counting sunspots and sunspot groups. Wolf was one of four people to independently, and more or less simultaneously, notice the coincidence between the 11-year sunspot cycle and the cycle of geomagnetic activity (1852).
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