Quote:
Originally Posted by freebeard
Which Solar cycle? Eleven years? 6000 years? 12,000?
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From a 9,600-year bi-decadal dendrochronolgy, Carbon-14 record, backed up by climate records, glacier fluctuations, sediment statigraphic and pollen records, solar cycles have been identified for periods of:
* 11-years
* 22-year Hale cycle ( sunspot )
* 45-years
* 57-years
* 88-years ( aurorae )
* 114- ( bristlecone pine ), 123-years
* 130 -years ( aurorae )
* 140-year ( Solar convective zone 3rd- harmonic ), 143-148-150-years
* 200- year ( Solar convective zone harmonic ), 208 ( bristlecone pine ),218-227-years
* 420- years ( Sun's convective zone fundamental oscillation ), 425-years
* with nine ( 9) Maunder events ( approx. 180-year oscillation )
* and eight ( 8 ) Sp'o'rer events ( approx. 220-year oscillation )
* and four ( 4) triplet events
* with a total solar-constant variability of up to 0.1 % for the Hale cycle.