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arXiv 0903.2002astro-ph.SR
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用CoMP进行日冕时距地震学研究

Time-Distance Seismology of the Solar Corona with CoMP

Steven Tomczyk, Scott W. McIntosh

摘要:

我们采用了一系列的多普勒图像获得的日冕多通道偏振仪(CoMP)仪器进行时距地震学的日冕。我们构建了该区域的第一个k Ω图。这些使我们能够分离向外和向内传播的波,并估计天空平面投影相速度的空间变化,以及向外和向内定向的波功率的相对量。向外和向内的波功率和所观察到的功率律谱的斜率之间的差距表明,低频Alfvenic运动遭受显着的衰减,因为它们的传播,符合各向同性MHD湍流。

英文摘要:

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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