Simulating regularity and randomness in sunspot activity

Details Simulating regularity and randomness in sunspot activity Simulating regularity and randomness in sunspot activity

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..863u&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

1

Sunspots: Models, Activity, Solar Magnetic Fields

Scientific paper

The time series of sunspot activity displays both regular features and randomness, and their interrelation has been studied during last decades. We present here a model of sunspot production which employs three components of solar magnetic field: the 22-year dynamo field, a weak constant relic field, and a randomly fluctuating field. Within this model, sunspots are produced when the total field exceeds the buoyancy threshold. This model can reproduce the main features of sunspot activity throughout the 400-year period of direct solar observations, including two different sunspot activity modes, the present, normal sunspot activity and the Maunder minimum. The two sunspot activity modes could be modeled by only changing the level of the dynamo field while keeping the other two components constant. We discuss the role of the three components and how their relative importance changes between normal activity and great minimum times. We found that the relic field must be about few per cent of the dynamo field in normal activity times. Also, we find that the dynamo field during the Maunder minimum was small but non-zero, being suppressed typically by an order of magnitude with respect to its value during normal activity times.

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