Time-distance Seismology of the Solar Corona with Comp
نویسندگان
چکیده
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−ω 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 Alfvénic motions suffer significant attenuation as they propagate, consistent with isotropic MHD turbulence. Subject headings: Sun: solar wind Sun: magnetic fields Sun: corona
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