Volume 387, Number 3, June I 2002
|Page(s)||1092 - 1099|
|Section||Planets and planetary systems|
|Published online||17 May 2002|
Solar -modes and surface magnetic fields: Is there an acoustic emission?
Department of Physics, UMIST, Manchester M60 1QD, UK e-mail: firstname.lastname@example.org
2 JILA, University of Colorado, Boulder, CO 80309-440, USA e-mail: email@example.com
Corresponding author: R. Jain, firstname.lastname@example.org
Accepted: 28 February 2002
We study the effect of magnetism on the surface amplitude of p-modes by creating power maps using Doppler velocity, line-depth and continuum intensity data taken by the Michelson Doppler Interferometer (MDI) instrument on board SOHO. This analysis, using proper tracking procedures, of MDI line-depth data and its comparison with the simultaneous Doppler velocity data is the first such analysis. All three datasets show that the p-mode power is suppressed in the magnetic region with suppression increasing with field strength. However, in the high-frequency range, the power is enhanced in the Doppler velocity and line-depth data but not in continuum intensity. This enhancement, when present, appears to be in intermediate field strength elements in the immediate vicinity of a magnetically active region.
Key words: Sun: helioseismology, oscillations, magnetic fields, photosphere, sunspots / methods: data analysis
© ESO, 2002
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