The long-term variations of the solar and heliospheric fields

Details The long-term variations of the solar and heliospheric fields The long-term variations of the solar and heliospheric fields

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..253s&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Computer Science

Sun: Magnetic Fields, Solar Wind, Solar-Terrestrial Relations

Scientific paper

The heliospheric field is determined by the largest-scale patterns of magnetism at the solar surface, dominated by the lower-latitude active regions during cycle maximum, and by the circumpolar fields during cycle minimum. To study these patterns, we simulate the evolution of the magnetic field at the solar surface and in the heliosphere during the last 340 years. We conclude that, contrary to current thinking, the observed magnetic flux in the polar regions of the Sun cannot be understood as merely a long-term accumulation of active-region decay products from a dynamo that modulates only the rate at which flux emerges from cycle to cycle. We suggest that simulation and observation may be reconciled if the high-latitude solar field decays on a time scale comparable to that of the sunspot cycle.

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