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We have analyzed five ROSAT HRI images of the Crab Nebula spanning the years1991 to 1997 and have found significant changes in the emission structure ofthe X-ray torus surrounding the pulsar. Certain regions increase in brightnessby about 20% over the six years, while others show decreases in surfacebrightness. The origin of these changes is unclear, but a possible explanationis that the bulk velocity of the synchrotron radiating electrons has decreasedon the order of 20% as well.Comment: 15 pages plus 6 figures, figure 1 and figure 6 are in color, to  appear in The Astrophysical Journal, Jan 1, 1999, Vol. 510, #

Temporal Variability of the X‐Ray Emission of the Crab Nebula Torus