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We observed the northern rim of the Cygnus Loop with the \textit{Suzaku}observatory in 5 pointings (P21-P25). From the spatially resolved analysis, allthe spectra are well fitted by the single component of the non-equilibriumionization plasma model. From the best-fit parameters, we found that theabundances of the heavy elements are significantly lower than the solar valuesexcept those at the outermost edge in P21 and P22. The origin of the depletedmetal abundances is still unclear while such deficiencies have been reportedfrom many other rim observations of the Loop. To explain these depletion at therim regions, we considered the several possibilities. The effects of theresonance-line-scattering and the grain condensation lower the values of theabundances. However, these are not sufficient to account for the abundancedepletion observed.  We found that the abundances at the outermost edge in P21 and P22 are higherthan those at the other regions. From the morphological point of view, it isreasonable to consider that this abundance inhomogeneity is derived from thebreakout or the thinness of the cavity wall of the Loop.

The Abundance Inhomogeneity in the Northern Rim of the Cygnus Loop