We all have listen from our childhood that the temperature of the earth is affected by sun. The temperature of the sun causes the temperature of the sun rise. But the research has been changed. The sunspot of the sun numerously changes.
Scientists have been tracking sunspots ever since Galileo pointed a telescope at the sun back in 1610. Since then, there have been two major sunspot records in human history: one that tracks individual spots and one that tracks groups of spots. Clette and his colleagues set out to reconcile some well-known discrepancies between the two records and in the process found that there may not have actually been a recent rise in sunspot activity after all.
The results, presented at the IAU XXIX General Assembly in Honolulu, Hawai`i, today, make it difficult to explain the observed changes in the climate that started in the 18th century and extended through the industrial revolution to the 20th century as being significantly influenced by natural solar trends.
The sunspot number is the only direct record of the evolution of the solar cycle over multiple centuries and is the longest scientific experiment still ongoing.
Despite a previously established link between solar activity and climate, the Sun most likely did not help cause the upward trend in global temperatures observed during the past 300 years, a new study presented Friday at the IAU XXIX General Assembly has revealed.
However Since the research was not focused specifically on climate issues the team could not comment on other possible causes for climate change. But Explanations that rely on simple correlations between changing climate and solar activity are not supported by the new sunspot series. Other explanations, or more complicated ones, must be responsible.”