SECULAR VARIATION OF DELTA-C-14 DURING THE MEDIEVAL SOLAR MAXIMUM - APROGRESS REPORT

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 pos tulated analog to solar activity during the MSM. Delta(14)C decreases steadily during the period AD 1065 to AD 1150 but with cyclical oscill ations around the decreasing trend. These oscillations can be successf ully modeled by four cycles. These four frequencies are 1/52 yr(-1), 1 /22 yr(-1), 1/11 yr(-1), and 1/5.5 yr, i.e., the 4th harmonic of the S uess cycle, the Hale and Schwabe cycles and the 2nd harmonic of the Sc hwabe cycle.