Solar variation - Wikipedia, the free encyclopedia
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Solar variations refer here to changes in the amount of total solar radiation and its spectral distribution. There are periodic components to these variations, the principal one being the 11-year sol...
en.wikipedia.org/wiki/Solar_variation
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Although the number of sunspots is the most easily observed feature, essentially all aspects of the Sun and solar activity are influenced by the solar cycle.
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www.windows.ucar.edu/tour/link=/sun/activity/solar_cycl...
www.windows.ucar.edu/tour/link=/sun/activity/solar_cycle.html
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The solar cycle is the rise and fall of the number of sunspots on the Sun. Solar activity is correlated to the number of sunspots on the Sun. As the number of sunspots goes up, solar activity occurrences go up.
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www.windows.ucar.edu/tour/link=/sun/sun_climate.html
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Tucson AZ (SPX) Aug 22, 2006 - A new telescope installed in 2004 at Kitt Peak, Arizona, to monitor the next two cycles of solar activity has recorded the onset of the next solar cycle. ... NSO researchers are continuing to use the new telescope to help understand the properties of the solar activity cycle.
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www.spacedaily.com/reports/Onset_of_Next_Solar_Activity...
www.spacedaily.com/reports/Onset_of_Next_Solar_Activity_Cycle_Observed_999.html
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A new 11-year cycle of heightened solar activity, bringing with it increased risks for power grids, critical military, civilian and airline communications, GPS signals and even cell phones and ATM transactions, showed signs it was on its way late yesterday when the cycle’s first sunspot appeared in the sun’s...
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www.noaanews.noaa.gov/stories2008/20080104_sunspot.html
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In 1848 Rudolf Wolf devised a daily method of estimating solar activity by counting the number of individual spots and groups of spots on the face of the sun. Wolf chose to compute his sunspot number by adding 10 ... He also more accurately determined the cycle's length to be 11.1 years by using early historical records.
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www.ngdc.noaa.gov/stp/SOLAR/SSN/ssn.html
www.ngdc.noaa.gov/stp/SOLAR/SSN/ssn.html
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This interpretation has been criticized for statistical reasons and because there are no observations that indicate significant changes in the solar irradiance. A set of data that supports the suggestion of a direct influence of solar activity on global climate is the variation of the solar cycle length.
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www.sciencemag.org/cgi/content/abstract/254/5032/698
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NASA Science News: What&apos ... Up & Downs: Solar maxima come every 11 years, but the ferocity of solar activity isn't the same each time. The 11-year peaks seem to be modulated by an even longer cycle, perhaps 100 years or more in length.
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science.nasa.gov/headlines/y2002/18jan_solarback.htm
science.nasa.gov/headlines/y2002/18jan_solarback.htm
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The last phase of heightened activity, dubbed Solar Cycle 23, peaked in 2000. The sunspot observed high in the sun's northern hemisphere on January 3 is the first definitely associated with Cycle 24, Biesecker explained.
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news.nationalgeographic.com/news/2008/01/080109-sunspot...
news.nationalgeographic.com/news/2008/01/080109-sunspots.html
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