  We report on numerical studies of two-dimensional electron systems in the
presence of a perpendicular magnetic field, with a high Landau level index (N >
1) half filled by electrons. Strong and sharp peaks are found in the wave
vector dependence of both static density susceptibility and equal-time
density-density correlation function, in finite-size systems with up to twelve
electrons. Qualitatively different from partially filled lowest (N=0) Landau
level, these results are suggestive of a tendency toward charge density wave
ordering in these systems. The ordering wave vector is found to decrease with
increasing N.
