Measuring helioseismic travel times

Details Measuring helioseismic travel times Measuring helioseismic travel times

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007an....328..215r&link_type=abstract

Astronomische Nachrichten, Vol.328, Issue 3, p.215-222

Astronomy and Astrophysics

Astronomy

7

Sun: Helioseismology, Methods: Data Analysis

Scientific paper

In time-distance helioseismology wave travel times are measured from the cross-correlation between Doppler velocities recorded at any two locations on the solar surface. We compare two different methods to extract the travel times from the noisy cross-correlation functions. The first method consists of fitting a 5-parameter analytic function to the cross-correlation to obtain the phase travel time. The second method consists of linearizing the distance between the observed cross-correlation and a sliding reference cross-correlation (the only parameter is the travel time). We find that the one-parameter fits are more robust with respect to noise. Using SOHO data from the MDI Structure Program for the years 1996-2003, we study in detail the statistical properties of the noise associated with the travel-time measurements for the two different fitting methods.

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