Computer Science – Sound
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2412l&link_type=abstract
American Astronomical Society Meeting 210, #24.12; Bulletin of the American Astronomical Society, Vol. 39, p.130
Computer Science
Sound
Scientific paper
The effects of magnetic fields on solar structures have often been investigated using the relative sound-speed difference between an active region and a quiet region. This difference, generally assumed to be directly related to the temperature difference, is used to calculate differences in the thermal structure. However, in the presence of magnetic fields, the speed of the waves no longer depends only on the gas pressure but the sum of the gas and magnetic pressure. The speed, therefore, cannot be directly related to the temperature. Our previous investigation has shown that when frequency differences between magnetic and non-magnetic regions are inverted, what we obtain is not the difference in sound speed, but the difference in the total wave speed. Thus, we cannot directly use what we obtain from inversions to determine temperature differences. We report here results of a theoretical study using solar models on how we can determine the actual temperature difference from the quantities that can be determined by helioseismic inversions, i.e., the wave-speed and adiabatic index differences.
Basu Sarbani
Li Lexin
Lin Chia-Hsien
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