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Dalton Minimum
The Dalton Minimum was a period of low sunspot count, representing low solar activity, named after the English meteorologist John Dalton, lasting from about 1790 to 1830〔Komitov and Kaftan 2004〕 or 1796 to 1820,〔Archibald, p. 32〕 corresponding to the period solar cycle 4 to solar cycle 7.
==Dalton Minimum and Temperature==
Like the Maunder Minimum and Spörer Minimum, the Dalton Minimum coincided with a period of lower-than-average global temperatures. During that period, there was a variation of temperature of about 1 °C.〔File:Temperaturreihe Deutschland.png, red line, 1795 to 1815〕
The cause of the lower-than-average temperatures during this period, or whether it is related to the low sunspot count, is not well understood. Recent papers have suggested that a rise in volcanism was largely responsible for the cooling trend.〔Wagner and Zorita, as well as Wilson.〕
While The Year Without a Summer, in 1816, occurred during the Dalton Minimum, the prime reason for that year's cool temperatures was the highly explosive eruption of Mount Tambora in Indonesia, which was one of the two largest eruptions in the past 2000 years.
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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