What to look for in the seismology of solar active regions

Details What to look for in the seismology of solar active regions What to look for in the seismology of solar active regions

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007an....328..286c&link_type=abstract

Astronomische Nachrichten, Vol.328, Issue 3, p.286

Astronomy and Astrophysics

Astronomy

37

Sun: Helioseismology, Sun: Magnetic Fields, Sunspots

Scientific paper

Using a newly developed extension of ray theory which accounts for mode transmission and conversion between fast and slow magnetoacoustic waves, as well as simple wave mechanical calculations, we find that strong surface magnetic fields, as may be found in solar and stellar active regions, have several related but distinct effects on seismic waves: transmission/conversion, shortened travel times, a directional filtering of acoustic waves entering the overlying atmosphere, and a tendency to more closely align velocities with the field as height increases in the atmosphere. Magnetic field inclination is particularly relevant to these effects. Here, we briefly review these findings, and present some new results on ray travel times and magnetic filtering.

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