Computer Science
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e..67t&link_type=abstract
Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,
Computer Science
Scientific paper
Helioseismology is permitting detailed study of structure and dynamics in the solar interior as the magnetic cycle advances. Although many International helioseismic projects have contributed, the nearly continuous Doppler imaging provided for over ten years by the ground-based Global Oscillation Network Group (GONG) project and the Michelson Doppler Imager (MDI) on the SOHO spacecraft allow us to evaluate changes within the sun over a significant fraction of the 22-year activity cycle. Nearly 10 million resonant acoustic modes of oscillation observable in the solar atmosphere provide probes of flows and structures over a wide range of depths within the solar convection zone and the tachocline of rotational shear at its base. The global magnetic dynamo responsible for the activity cycles is believed to operate in a distributed manner throughout these regions, but the principal stretching to achieve strong toroidal magnetic fields (responsible for the eventual emergence of sunspot pairs) proceeds in the tachocline. We review the evidence for variations in the differential rotation observed near the tachocline, of propagating bands of zonal flow speedup observed in the near-surface shear layer, and of changes in the meridional circulations as the cycle advances. We also discuss the evolving patterns of streaming flows known as solar subsurface weather (SSW) and of their interactions with magnetic active regions, often exhibiting prominent inflows at shallow depths and strong outflows deeper down within that near-surface shear layer. Such a range of clues being provided by helioseismology about the complex dynamics proceeding with the convection zone are serving to guide efforts to build self-consistent models of the solar global dynamo.
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