|
Collection:
|
|
NASA Planetary Photo Journal Collection
Collection
NASA Planetary Photo Journal Collection
Collection
|
|
Title:
|
|
Slope Streaks in Terra Sabaea
Title
Slope Streaks in Terra Sabaea
Title
|
|
Original Caption Released with Image:
|
Figure 1 Click on image for larger version This HiRISE image shows the rim of a crater in the region of Terra Sabaea in the northern hemisphere of Mars. The subimage (figure 1) is a close-up view of the crater rim revealing dark and light-toned slope streaks. Slope streak formation is among the few known processes currently active on Mars. While their mechanism of formation and triggering is debated, they are most commonly believed to form by downslope movement of extremely dry sand or very fine-grained dust in an almost fluidlike manner (analogous to a terrestrial snow avalanche) exposing darker underlying material. Other ideas include the triggering of slope streak formation by possible concentrations of near-surface ice or scouring of the surface by running water from aquifers intercepting slope faces, spring discharge (perhaps brines), and/or hydrothermal activity. Several of the slope streaks in the subimage, particularly the three longest darker streaks, show evidence that downslope movement is being diverted around obstacles such as large boulders. Several streaks also appear to originate at boulders or clumps of rocky material. In general, the slope streaks do not have large deposits of displaced material at their downslope ends and do not run out onto the crater floor suggesting that they have little reserve kinetic energy. The darkest slope streaks are youngest and can be seen to cross cut and superpose older and lighter-toned streaks. The lighter-toned streaks are believed to be dark streaks that have lightened with time as new dust is deposited on their surface. Observation Geometry Image PSP_0 01808_1875
Original_Caption_Rel eased_with_Image
Figure 1 Click on image for larger version This HiRISE image shows the rim of a crater in the region of Terra Sabaea in the northern hemisphere of Mars. The subimage (figure 1) is a close-up view of the crater rim revealing dark and light-toned slope streaks. Slope streak formation is among the few known processes currently active on Mars. While their mechanism of formation and triggering is debated, they are most commonly believed to form by downslope movement of extremely dry sand or very fine-grained dust in an almost fluidlike manner (analogous to a terrestrial snow avalanche) exposing darker underlying material. Other ideas include the triggering of slope streak formation by possible concentrations of near-surface ice or scouring of the surface by running water from aquifers intercepting slope faces, spring discharge (perhaps brines), and/or hydrothermal activity. Several of the slope streaks in the subimage, particularly the three longest darker streaks, show evidence that downslope movement is being diverted around obstacles such as large boulders. Several streaks also appear to originate at boulders or clumps of rocky material. In general, the slope streaks do not have large deposits of displaced material at their downslope ends and do not run out onto the crater floor suggesting that they have little reserve kinetic energy. The darkest slope streaks are youngest and can be seen to cross cut and superpose older and lighter-toned streaks. The lighter-toned streaks are believed to be dark streaks that have lightened with time as new dust is deposited on their surface. Observation Geometry Image PSP_0 01808_1875
Original Caption Released with Image
|
|
Original Caption Released with Image:
|
|
was taken by the High Resolution Imaging Science Experiment (HiRISE) camera onboard the Mars Reconnaissance Orbiter spacecraft on 15-Dec-2006. The complete image is centered at 7.4 degrees latitude, 47.0 degrees East longitude. The range to the target site was 272.1 km (170.1 miles). At this distance the image scale is 54.4 cm/pixel (with 2 x 2 binning) so objects ~163 cm across are resolved. The image shown here has been map-projected to 50 cm/pixel and north is up. The image was taken at a local Mars time of 03:36 PM and the scene is illuminated from the west with a solar incidence angle of 53 degrees, thus the sun was about 37 degrees above the horizon. At a solar longitude of 150.7 degrees, the season on Mars is Northern Summer.
NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems, Denver, is the prime contractor for the project and built the spacecraft. The High Resolution Imaging Science Experiment is operated by the University of Arizona, Tucson, and the instrument was built by Ball Aerospace and Technology Corp., Boulder, Colo.
Original_Caption_Rel eased_with_Image
was taken by the High Resolution Imaging Science Experiment (HiRISE) camera onboard the Mars Reconnaissance Orbiter spacecraft on 15-Dec-2006. The complete image is centered at 7.4 degrees latitude, 47.0 degrees East longitude. The range to the target site was 272.1 km (170.1 miles). At this distance the image scale is 54.4 cm/pixel (with 2 x 2 binning) so objects ~163 cm across are resolved. The image shown here has been map-projected to 50 cm/pixel and north is up. The image was taken at a local Mars time of 03:36 PM and the scene is illuminated from the west with a solar incidence angle of 53 degrees, thus the sun was about 37 degrees above the horizon. At a solar longitude of 150.7 degrees, the season on Mars is Northern Summer.
NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems, Denver, is the prime contractor for the project and built the spacecraft. The High Resolution Imaging Science Experiment is operated by the University of Arizona, Tucson, and the instrument was built by Ball Aerospace and Technology Corp., Boulder, Colo.
Original Caption Released with Image
|
|
Image Credit:
|
|
NASA/JPL/Univ. of Arizona
Image_Credit
NASA/JPL/Univ. of Arizona
Image Credit
|
|
Produced By:
|
|
University of Arizona/HiRise-LPL
Produced_By
University of Arizona/HiRise-LPL
Produced By
|
|
Mission:
|
|
Mars Reconnaissance Orbiter (MRO)
Mission
Mars Reconnaissance Orbiter (MRO)
Mission
|
|
Spacecraft:
|
|
Mars Reconnaissance Orbiter (MRO)
Spacecraft
Mars Reconnaissance Orbiter (MRO)
Spacecraft
|
|
Target Name:
|
|
Mars
Target_Name
Mars
Target Name
|
|
Is a satellite of:
|
|
Sol (our sun)
Is_a_satellite_of
Sol (our sun)
Is a satellite of
|
|
Instrument:
|
|
HiRISE
Instrument
HiRISE
Instrument
|
|
Product Size:
|
|
2048 samples x 2776 lines
Product_Size
2048 samples x 2776 lines
Product Size
|
|
facet_what:
|
|
Sun
facet_what
Sun
facet_what
|
|
facet_what:
|
|
Crater
facet_what
Crater
facet_what
|
|
facet_what:
|
|
Mars
facet_what
Mars
facet_what
|
|
facet_what:
|
|
Terra
facet_what
Terra
facet_what
|
|
facet_what:
|
|
MRO
facet_what
MRO
facet_what
|
|
facet_what:
|
|
Mars Reconnaissance Orbiter (MRO)
facet_what
Mars Reconnaissance Orbiter (MRO)
facet_what
|
|
facet_what:
|
|
High Resolution Imaging Science Experiment (HiRISE)
facet_what
High Resolution Imaging Science Experiment (HiRISE)
facet_what
|
|
facet_where:
|
|
Jet Propulsion Laboratory
facet_where
Jet Propulsion Laboratory
facet_where
|
|
facet_where:
|
|
Denver
facet_where
Denver
facet_where
|
|
facet_where:
|
|
Mars
facet_where
Mars
facet_where
|
|
facet_where:
|
|
Arizona
facet_where
Arizona
facet_where
|
|
facet_where:
|
|
California
facet_where
California
facet_where
|
|
facet_where:
|
|
Washington
facet_where
Washington
facet_where
|
|
facet_where:
|
|
Jet Propulsion Laboratory (JPL)
facet_where
Jet Propulsion Laboratory (JPL)
facet_where
|
|
Image #:
|
|
PIA09572
|
|
UID:
|
|
SPD-PHOTJ-PIA09572
UID
SPD-PHOTJ-PIA09572
UID
|
|
orignial url:
|
orignial_url
orignial url
|
