The Meaning of Travel Time in Time-Distance Helioseismology

Details The Meaning of Travel Time in Time-Distance Helioseismology The Meaning of Travel Time in Time-Distance Helioseismology

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.4206d&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #42.06; Bulletin of the American Astronomical Society, Vol. 31, p.883

Astronomy and Astrophysics

Astronomy

Scientific paper

Oscillation signals measured at two spatial locations on the Sun are cross-correlated and the position of the envelope peak or a phase peak of the correlation function is called the travel time. The relation of this observationally derived quantity and the theoretical travel time of a wavepacket between the two locations is not unique. The conditions that establish uniqueness are given and the effects of breaking the uniqueness criteria are demonstrated. The oscillation signals are measured over a finite area at each spatial location. The effect of spatial averaging and the meaning of the observationally derived quantity called travel time is discussed.

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