Abstract
We analyze and discuss the geometrical and physical properties of the geometrically coherent, and the time-variable radio spectral index perturbations near the center of the Crab Nebula recently discovered by Bietenholz & Kronberg. Although the detailed explanation of the three-dimensional geometry of the a perturbations is not yet clear, we propose that they are the sites of electron acceleration by MHD waves. The MHD waves are also the cause of the isotropization of the plasma flow outside the inner emission hole at the Crab's center, and we show how the MHD turblence near the shock produces the observed spectral index, a α∼0 in the α-ridges, and a somewhat steeper spectrum further out in the supernova remnant, as is also observed
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