Simulations of the gross solar magnetic field during sunspot cycle 21

Details Simulations of the gross solar magnetic field during sunspot cycle 21 Simulations of the gross solar magnetic field during sunspot cycle 21

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..106..251s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 106, Aug. 1986, p. 251-268. NASA-Navy-supported research.

Physics

12

Computerized Simulation, Solar Cycles, Solar Magnetic Field, Sunspots, Magnetic Poles, Radial Distribution, Solar Activity, Spatial Resolution, Transport Properties

Scientific paper

Regarding new bipolar magnetic regions as sources of flux, the evolution of the radial component of the solar photospheric magnetic field during 1976-1984 has been simulated with a spatial resolution of about 34,000 km, and the corresponding evolution of its absolute value averaged over the visible disk is derived. For nominal values of the transport parameters, this simulated gross field is in close, though imperfect, agreement with the observed gross field and its associated indices of solar activity. By analyzing the response of the simulated gross field to variations in the transport parameters and the source properties, it is found that the simulated field originates in newly erupted bipolar regions. The lifetimes of these regions are almost always less than three mo. Consequently, the strength of the simulated gross field is a measure of the current level of solar activity, and any recurrent patterns with lifetimes in excess of six mo must reflect the continuing eruption of new flux at 'active longitudes' rather than the persistence of old flux in long-lived magnetic structures.

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