Long-term solar cycles according to data on the cosmogenic beryllium concentration in ice of central Greenland |
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Authors: | M G Ogurtsov |
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Institution: | 1.Ioffe Physicotechnical Institute,Russian Academy of Sciences,St. Petersburg,Russia;2.Main (Pulkovo) Astronomical Observatory,Russian Academy of Sciences,St. Petersburg,Russia |
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Abstract: | Data on the concentrations of the cosmogenic 10Be isotope and Na+ and Ca2+ ions, as well as on ice accumulation rates in central Greenland, obtained by the GISP2 collaboration were studied in a time
interval spanning about 40 000 recent years. Joint analysis of the indicated glacial and chemical paleoseries demonstrated
that in a period from 12 008 to 24 008 years ago, the 10Be flux variations were most free of influence of climate and changes in the geomagnetic dipole moment. As a consequence,
this time interval is most suitable for studying periodicities of purely solar nature. Statistical analysis of the 10Be flux data has revealed significant variations with periods of 500–800 years and 1300–1600 years in the time interval from
12 008 to 17 008 years ago. This evidence favors the existence of the appropriate cycles of solar activity in the mentioned
epoch. Similar periodicities are also revealed in the time interval from 3288 to 8008 years ago. |
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