The University of Arizona
Open Access Open Access  Restricted Access Subscription Access

Secular variation of delta (super 14) C during the Medieval solar maximum; a progress report.

P E Damon, C J Eastoe, M K Hughes, R M Kalin, A Long, A N Peristykh

Abstract


The Earth is within the Contemporaneous Solar Maximum (CSM), analogous to the Medieval Solar Maximum (MSM). If this analogy is valid, solar activity will continue to increase well into the 21st century. We have completed 75 single-ring and 10 double-ring measurements from AD 1065 to AD 1150 to obtain information about solar activity during this postulated analog to solar activity during the MSM. Delta (super 14) C decreases steadily during the period AD 1065 to AD 1150 but with cyclical oscillations around the decreasing trend. These oscillations can be successfully modeled by four cycles. These four frequencies are 1/52 yr (super -1) , 1/22 yr (super -1) , 1/11 yr (super -1) , and 1/5.5 yr, i.e., the 4th harmonic of the Suess cycle, the Hale and Schwabe cycles and the 2nd harmonic of the Schwabe cycle.

Keywords


Contemporaneous solar maximum;Medieval solar maximum;regression analysis;Sequoia National Park;cellulose;polysaccharides;cyclic processes;carbohydrates;secular variations;modern analogs;solar activity;statistical analysis;tree rings;Holocene;upper Holocene;Be 10;alkaline earth metals;beryllium;metals;organic compounds;Cenozoic;Quaternary;C 14;carbon;isotopes;radioactive isotopes

Full Text:

PDF