Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640007i&link_type=abstract
American Astronomical Society, AAS Meeting #216, #400.07; Bulletin of the American Astronomical Society, Vol. 41, p.855
Astronomy and Astrophysics
Astronomy
Scientific paper
In this work a numerically simulated sunspot embedded in a realistic model of solar magnetoconvection is analyzed using time-distance technique of local helioseismology. The purpose of this study is to improve our understanding of travel-time shifts measured in sunspots. We use the oscillation data obtained from the simulations for measurements of p-modes travel-time shifts by applying the time-distance helioseismology technique. The measurements are carried out for several distances permitted by the depth of the simulation box, with and without use of phase-speed filters. The phase-speed filtering procedure improves the signal-to-noise ratio of the travel-time measurements for short distances, but it may also introduce a bias in the travel-time shifts. We discuss the interior properties of the sunspot inferred from our measurements. The data for this work is kindly provided by Matthias Rempel (HAO/NCAR).
Ilonidis Efstathios
Kosovichev Alexander
Zhao Jun
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