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solar maximum
(詳細はsolar cycle of the Sun. During solar maximum, large numbers of sunspots appear and the sun's irradiance output grows by about 0.07%. The increased energy output of solar maxima can impact Earth's global climate and recent studies have shown some correlation with regional weather patterns.
At solar maximum, the Sun's magnetic field lines are the most distorted due to the magnetic field on the solar equator rotating at a slightly faster pace than at the solar poles. The solar cycle takes an average of about 11 years to go from one solar maximum to the next, with duration observed varying from 9 to 14 years.
Large solar flares often occur during a maximum. For example, the solar storm of 1859 struck the Earth with such intensity that the northern lights were visible as far from the poles as Cuba and Hawaii.
==Predictions==
Predictions of a future maximum's timing and strength are very difficult; predictions vary widely. There was a solar maximum in 2000. In 2006 NASA initially expected a solar maximum in 2010 or 2011, and thought that it could be the strongest since 1958.〔("Solar Storm Warning" ), Science@NASA'', 10 March 2006, Accessed 26 Mar. 2010〕 However, the solar maximum was not declared to have occurred until 2014, and even then was ranked among the weakest on record.〔(【引用サイトリンク】title=Solar Mini-Max )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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