Direct Measurement of Wave Kernels in Time-Distance Helioseismology

Details Direct Measurement of Wave Kernels in Time-Distance Helioseismology Direct Measurement of Wave Kernels in Time-Distance Helioseismology

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp23c..02d&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP23C-02

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7522 Helioseismology, 7524 Magnetic Fields, 7529 Photosphere

Scientific paper

Solar f-mode waves are surface-gravity waves which propagate horizontally in a thin layer near the photosphere with a dispersion relation approximately that of deep water waves. At the power maximum near 3 mHz, the wavelength of 5 Mm is large enough for various wave scattering properties to be observable. Gizon and Birch (2002,ApJ,571,966) have calculated kernels, in the Born approximation, for the sensitivity of wave travel times to local changes in damping rate and source strength. In this work, using isolated small magnetic features as approximate point source scatterers, such a kernel has been measured. The observed kernel contains similar features to a theoretical damping kernel but not for a source kernel. A full understanding of the effect of small magnetic features on the waves will require more detailed modeling.

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