Together with the main 11-year cycle, solar activity also displays intracycle pe- riodicities. A simple nonlinear model that describes the 11-year solar cycle with subperi- odicities can be derived from the usual α – ω dynamo theory in the form of a Van der Pol equation with a forcing term. In this paper the results obtained from the Van der Pol oscilla- tor describing the amplitude modulations and periodicities observed from the data set of the global daily coronal emission of the Fe XIV line at 530.3 nm are presented.
A simple model to describe the solar cycle periodicities below 11 years
CARBONE, Vincenzo
2008-01-01
Abstract
Together with the main 11-year cycle, solar activity also displays intracycle pe- riodicities. A simple nonlinear model that describes the 11-year solar cycle with subperi- odicities can be derived from the usual α – ω dynamo theory in the form of a Van der Pol equation with a forcing term. In this paper the results obtained from the Van der Pol oscilla- tor describing the amplitude modulations and periodicities observed from the data set of the global daily coronal emission of the Fe XIV line at 530.3 nm are presented.File in questo prodotto:
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