Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..281n&link_type=abstract
In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun
Physics
Solar Oscillations, Magnetohydrodynamics
Scientific paper
Attempts to detect magnetohydrodynamic waves in the solar photosphere by identifying oscillations in the magnetic field have proved problematic due to suspected contributions from systematic temperature and density fluctuations causing the spectral line formation height to vary, which in turn samples a vertical gradient in the magnetic field strength. We investigate this effect through the analysis of data obtained with the Advanced Stokes Polarimeter in spectral lines with notoriously different temperature sensitivities. The temporal behavior of the magnetic field strength in sunspot and plage is presented with special consideration to line formation physics occurring in the dynamic solar atmosphere. These results are compared to forward modeling of Stokes profiles with a radiative transfer code given a sunspot atmosphere perturbed by an MHD oscillation. The possibility of a thermodynamic diagnostic is discussed.
Norton Andrew
Uitenbroek Han
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