Tag Archives: ripples

Almost a dune

A Piece of Mars: This field of 2 m wide sand ripples has a dark splotch in the middle (the scene is 300x225 m or 984x738 ft). The splotch is the peak of a low hill that straddles the ...

Changing winds

A piece of Mars: There are two sets of ripples here: tan ones and gray ones, each oriented to a different wind (scene is 300x225 m, or 984x738 ft). The gray ones sit on top of the tan ones, so ...

Martian waves

A piece of Mars: The swirly candy stripes in these big dark dunes are layers inside that have been made visible by wind erosion (the scene is 1.5x0.9 km, or 0.93x0.56 mi). It's rare to see the inside structure of ...

How the wind turns

A piece of Mars: The two shadowed hills in the upper part of this frame (497x373 m or 1631x1224 ft across) rest on a flat plain covered in large ripples. On the plain the ripples are aligned north-south, formed perpendicular ...

What on Mars?

A piece of Mars: What on Mars is this (the scene is 600x450 m, or 0.37x0.28 mi)? It can be hard to tell. The lines are ridges of windblown dunes or ripples, the dark gray stuff is active sand blowing ...

Small dunes up high, big dunes down low

A piece of Mars: This 1018x1352 m (0.63x0.84 mi) dune-covered scene has split topography: the the bottom part is up on a plateau, and the upper part is in a broad valley. The dunes up on the plateau are smaller ...

How hills change dunes

A piece of Mars: Using dunes to interpret the winds can be a tricky business. Here's one reason why: most of the dunes here go from the upper left to lower right. But the ones inside the funky oblong crater ...

Where is Curiosity on her 1 Mars year anniversary?

A piece of Mars: Curiosity has been trolling around on Mars for one martian year, so I think it's time I posted an update on where it is and what it's seeing. Right now (late June 2014), the rover is ...

In the lee

A piece of Mars: This crater (290 m or 950 ft across) is crawling with all sorts of ripples and dunes. The wind mainly blows from the top to the bottom of the frame, and it is responsible for the ...

Whither the wind

A piece of Mars: Which way did the wind blow here? You can tell by looking at the dune and its ripples. The slip face (the avalanching slope of the dune) faces downwind, so the strongest wind here mainly blows ...