Time-Distance Seismology of the Solar Corona with CoMP

Details Time-Distance Seismology of the Solar Corona with CoMP Time-Distance Seismology of the Solar Corona with CoMP

2009-03-11

arxiv.org/abs/0903.2002v1

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.

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