Triple correlations in local helioseismology
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Publication:3442890
DOI10.1002/ASNA.200610723zbMATH Open1118.85019arXivastro-ph/0610745OpenAlexW3106429588MaRDI QIDQ3442890
Publication date: 23 May 2007
Published in: Astronomische Nachrichten: A Journal on all Fields of Astronomy (Search for Journal in Brave)
Abstract: A central step in time-distance local helioseismology techniques is to obtain travel times of packets of wave signals between points or sets of points on the visible surface. Standard ways of determining group or phase travel times involve cross-correlating the signal between locations at the solar photosphere and determining the shift of the envelope of this cross correlation function, or a zero crossing, using a standard wavelet or a reference wave packet. Here a novel method is described which makes use of triple correlations, i.e. cross-correlating signal between three locations. By using an average triple correlation as reference, differential travel times can be extracted in a straightforward manner.
Full work available at URL: https://arxiv.org/abs/astro-ph/0610745
Hydrodynamic and hydromagnetic problems in astronomy and astrophysics (85A30) Radiative transfer in astronomy and astrophysics (85A25)
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