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History and images of sunspots. ... Dark spots, some as large as 50,000 miles in diameter, move across the surface of the sun, contracting and expanding as they go. These strange and powerful phenomena are known as sunspots.
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www.exploratorium.edu/sunspots/
www.exploratorium.edu/sunspots/
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Scientists track solar cycles by counting sunspots -- cool planet-sized areas on the Sun where intense magnetic loops poke through the star's visible surface. ... Counting sunspots is not as straightforward as it sounds. Suppose you looked at the Sun through a pair of (properly filtered) low power binoculars --
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www.spaceweather.com/glossary/sunspotnumber.html
www.spaceweather.com/glossary/sunspotnumber.html
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Want to know the sunspot number on your birth date? During the great depression, or at the end of World War II? Find out here, and also visit the Sunspots and Solar Cycle home page. ... At the "solar maximum" there are more solar flares, more sunspots, more sun quakes, more of everything that solar physicists love to study.
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www.spaceweather.com/java/sunspot.html
www.spaceweather.com/java/sunspot.html
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SPACE WEATHER; Current conditions ... Solar wind speed: 320.8 km/sec density: 2.4 protons/cm3; explanation | more data; Updated: Today at 0715 UT ... X-ray Solar Flares; 6-hr max: A0 0715 UT Nov11 ; 24-hr: A0 0000 UT Nov11 ; explanation | more data; Updated: Today at: 0715 UT...
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SOHO Web site; Stanford University Sunspot Page;; Sunspots and the solar cycle; Space Weather Primer; Space Weather News;; For more information contact: ... Image 1 caption: This image is an artist's concept of what lies beneath sunspots, enigmatic, planet-sized dark areas on the surface of the Sun. The bottom close-up is...
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www.gsfc.nasa.gov/topstory/20010919sunspot.html
www.gsfc.nasa.gov/topstory/20010919sunspot.html
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The photosphere often has dark spots on it. The spots are sunspots. They were first observed by Galileo when he looked at the Sun with a telescope (hopefully by projecting the image on a piece of paper!). Here is how it might have looked to him.
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zebu.uoregon.edu/~soper/Sun/sunspots.html
zebu.uoregon.edu/~soper/Sun/sunspots.html
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Sunspot - Wikipedia, the free encyclopedia
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A sunspot is an area on the Sun's surface (photosphere) that is marked by intense magnetic activity, which inhibits convection, forming areas of reduced surface temperature. They can be visible from...
en.wikipedia.org/wiki/Sunspot
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Who was the first to publish on sunspots? ... What is possibly the earliest time in recorded history that sunspots were observed with the naked eye (Note: Observing by naked eye is dangerous!)? ... Would you like to learn more about sunspots? You may read what the National Solar Observatory's "Mr. Sunspot" has to say!
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solar-center.stanford.edu/cgi-bin/quiz2.pl/sunspot_quiz...
solar-center.stanford.edu/cgi-bin/quiz2.pl/sunspot_quiz.html
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