The Compression Ratio of the Supernova Remnant SN 1006

We present the results of an analysis of a Chandra X-ray observation of the northeastern rim of SN 1006. The bright X-ray emitting filaments in this region are extraordinarily narrow compared to the angular radius of the remnant. These results suggest that the ambient magnetic field is highly compressed with a compression ratio much larger than four. The compressed field strength is comparable to the equipartition value. In this case, the maximum energy of the shock accelerated electrons is most likely limited by synchrotron losses. These results support recent models that suggest that efficient cosmic-ray acceleration affects the dynamics of the remnant.