Time-Distance Measurements of Cross-Correlation Asymmetries around NOAA AR 10486

Details Time-Distance Measurements of Cross-Correlation Asymmetries around NOAA AR 10486 Time-Distance Measurements of Cross-Correlation Asymmetries around NOAA AR 10486

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...648l..75j&link_type=abstract

The Astrophysical Journal, Volume 648, Issue 1, pp. L75-L78.

Astronomy and Astrophysics

Astronomy

3

Sun: Helioseismology, Sun: Magnetic Fields, Sun: Oscillations, Sun: Sunspots

Scientific paper

We apply time-distance helioseismology to NOAA AR 10486 in order to examine the effect the presence of magnetic fields has on the resulting cross-correlations. Large-amplitude asymmetries between waves propagating in opposite directions are observed. The asymmetries can be attributed to suppression and absorption of seismic waves by the magnetic field. Unraveling the effects of magnetic field on the waves from the effects of sound-speed perturbations and flows is one of the major challenges facing time-distance helioseismology.

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