Frost Streaks in the Annual South Polar Cap. These bright, streamlined albedo features are associated with craters near the retreating margin of the annual frost cap. The bright streaks are interpreted as accumulations of carbon dioxide frost in the lee of the craters, and suggest that winds may be effective in redistributing frost in the polar regions of Mars. The wind direction indicated by the streaks suggests that the streaks are laid down in southern winter. The image is about 1200 km across.
North is to the upper right.