Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-03-11
Astrophys.J.697:1384-1391,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
In Press ApJ. 8 pages and 8 color figures
Scientific paper
10.1088/0004-637X/697/2/1384
We employ a sequence of Doppler images obtained with the Coronal Multi-channel Polarimeter (CoMP) instrument to perform time-distance seismology of the solar corona. We construct the first k-omega diagrams of the region. These allow us to separate outward and inward propagating waves and estimate the spatial variation of the plane-of-sky projected phase speed, and the relative amount of outward and inward directed wave power. The disparity between outward and inward wave power and the slope of the observed power law spectrum indicate that low-frequency Alfvenic motions suffer significant attenuation as they propagate, consistent with isotropic MHD turbulence.
McIntosh Scott W.
Tomczyk Steven
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