Inverted Channels Near Juventae Chasma
Inverted Channels Near Juventae Chasma
PSP_003223_1755  Science Theme: Fluvial Processes
This image shows several long, sinuous features on the plains near Juventae Chasma. These features have been explained as former stream channels now preserved in inverted relief.

Inverted relief occurs when a formerly low-lying area becomes high-standing. For instance, depressions may become filled with lava that is more resistant to erosion. In the case of stream channels, there are several possible reasons why the channel might stand out in inverted relief. The streambed may contain larger rocks, which remain while fine material is blown away by the wind, or it could be cemented by some chemical precipitating from flowing water.

These features are old, since several impact craters cut the ridges. They provide important information about past processes on Mars. Understanding how streams could have formed is an important issue in understanding the history of water on Mars.

Written by: Colin Dundas  (10 October 2007)

This is a stereo pair with PSP_003724_1755.
Acquisition date
04 April 2007

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
262.8 km (163.3 miles)

Original image scale range
26.3 cm/pixel (with 1 x 1 binning) so objects ~79 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
55°, with the Sun about 35° above the horizon

Solar longitude
212.9°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  352.6°
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Black & white is 5 km across; enhanced color about 1 km
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NASA/JPL/University of Arizona

NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.