HiRISE | Layered Deposits and Wind Ripples (ESP_070049

NASA/JPL-Caltech/UArizona

Layered Deposits and Wind Ripples
ESP_070049_2170 Science Theme: Sedimentary/Layering Processes

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These impact craters in the northern middle latitudes have interesting interiors: all of them have wind-blown (aeolian) ripples.

Outside of the craters and along the crater floors, the ripples are all oriented in the same direction. However, along the walls of some of the larger craters, the ripples are situated radially away from the center, indicating the winds moving inside the larger craters can be influenced by the topography of the crater wall.

Additionally, many of the larger craters have layered mesas along their floors that are likely sedimentary deposits laid down after the craters formed but prior to the development of the aeolian ripples.

Written by: Cathy Weitz (narration: Tre Gibbs) (16 November 2021)

Acquisition date
06 July 2021

Local Mars time
15:34

Latitude (centered)
36.745°

Longitude (East)
65.080°

Spacecraft altitude
292.2 km (181.6 miles)

Original image scale range
58.6 cm/pixel (with 2 x 2 binning) so objects ~176 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
3.4°

Phase angle
44.2°

Solar incidence angle
48°, with the Sun about 42° above the horizon

Solar longitude
68.4°, Northern Spring

For non-map projected images
North azimuth: 96°
Sub-solar azimuth: 4.8°

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Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

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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-Caltech/UArizona

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.