Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..17e..13c&link_type=abstract
Highlights of Recent Progress in the Seismology of the Sun and Sun-Like Stars, 26th meeting of the IAU, Joint Discussion 17, 23
Physics
Scientific paper
I will review recent progress in the theoretical aspects of magnetohelioseismology. It is well known that large magnetic- flux concentrations (like sunspots) absorb energy from and change the phase speed of solar acoustic oscillations, f- and p-modes, incident upon them. When this was first observed it was hoped that this information could be used to probe the subsurface and internal structure of sunspots. However, interpretation of the observations proved difficult. It was only recently that the likely mechanism causing each of these effects was identified. Models based on the conversion of acoustic oscillations to magnetohydrodynamic waves within sunspots, though simplistic in several respects, can now explain the absorption and phase speed change simultaneously. In this contribution I will discuss results from recent modelling efforts carried out at the Canadian Space Agency, in collaboration with colleagues at Monash University, Australia. The model now accounts for wave propagation both above and below the solar surface. As such, we can now comment on the sensitivity of the observed Doppler velocity at the solar surface to the environment in which the observations are typically made. Our primary conclusion is that the magnetic field (its strength and inclination) generally plays a crucial role in the wave propagation properties of magnetically active regions. Prospective future directions for magnetohelioseismology will also be discussed.
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