A Flow Margin in Phlegra Dorsa
NASA/JPL/University of Arizona
A Flow Margin in Phlegra Dorsa
ESP_026738_2080  Science Theme: Volcanic Processes
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These HiRISE images form a stereo pair to examine the topography of the margin of a flow.

The Phlegra Dorsa region consists of ancient hills that have been surrounded and partially buried by flows from the Cerberus Fossae to the south. These flows could have been mud-laden water floods or very large lava flows.

The margin visible here is similar to that on lava flows that have had a long history of liquid lava being injected underneath the solidified crust. Relatively fresh impact craters and recent dust devil tracks are also visible in this image.

The second half of this stereo pair has another well-known formation.

Written by: Laszlo Kestay  (2 May 2012)

This is a stereo pair with ESP_026461_2080.
 
Acquisition date
09 April 2012

Local Mars time
15:15

Latitude (centered)
27.805°

Longitude (East)
173.026°

Spacecraft altitude
291.3 km (181.1 miles)

Original image scale range
30.6 cm/pixel (with 1 x 1 binning) so objects ~92 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
18.8°

Phase angle
25.6°

Solar incidence angle
44°, with the Sun about 46° above the horizon

Solar longitude
94.8°, Northern Summer

For non-map projected images
North azimuth:  95°
Sub-solar azimuth:  13.1°
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All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona

POSTSCRIPT
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.