TIME-DISTANCE SEISMOLOGY OF THE SOLAR CORONA WITH CoMP

Abstract

We employ a sequence of Doppler images obtained with the Coronal\nMulti-channel Polarimeter (CoMP) instrument to perform time-distance seismology\nof the solar corona. We construct the first k-omega diagrams of the region.\nThese allow us to separate outward and inward propagating waves and estimate\nthe spatial variation of the plane-of-sky projected phase speed, and the\nrelative amount of outward and inward directed wave power. The disparity\nbetween outward and inward wave power and the slope of the observed power law\nspectrum indicate that low-frequency Alfvenic motions suffer significant\nattenuation as they propagate, consistent with isotropic MHD turbulence.\n