Records of Production Rate in the Little Ice Age of Cosmic Ray Product 32Si in Arctic Ice Cores

• Main Author: Kato, Kikuo
• Language: English
• Published: 1981
• Subjects: Arctic; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/record/1185/files/KJ00000011711.pdf

P(論文) Solar change, if it exists, must affect terrestrial climatic change. Recent observations of the total flux of solar radiation and the sunspot number have demonstrated the constancy of the sun. Therefore, the relation to solar change of climatic change should be investigated by using longer records. The change of production rate of the cosmic ray products in the earth's atmosphere is known to be useful as a measure of solar activity. Then, records indicating the production rates of ^<14>C and ^<32>SSi) in the atmosphere were investigated, especially in the Maunder Minimum, the period 1645-1715 A. D. in which almost no sunspots are considered to have occurred. The de Vries Peak, a prominent peak in the atmospheric ^<14>C concentration, is in remarkable agreement in sense and date with the Maunder Minimum. Nevertheless, the records indicating that the ^<32>(Si) production rate shows a trough in the Maunder Minimum was found in Arctic ice cores. This discrepancy found, if true, raises a doubt on the existence of the Maunder Minimum. Factors which might cause this discrepancy are discussed. departmental bulletin paper