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Transverse aeolian ridges (TARs) are a type of sand ridge on Mars and are one of the most common landforms on Mars. They are mid-way in height between dunes and ripples; they are not well understood. One possible mechanism for their formation is that larger grains like pebbles are rolled on top of smaller ripples; then, finer dust settles into the cracks, making the TAR larger than typical ripples.〔http://www.uahirise.org/ESP_042625_1655〕 TARs are often seen in low places like valley floors. Currently, they are not moving. TARs are most common near the equator. The term "transverse aeolian ridge", or "TAR" was first used by M. Bourke et al. in 2003. == Gallery == WikiESP 039563 1730yardangs.jpg|Yardangs, as seen by HiRISE under HiWish program. Location is Arsinoes Chaos. The next image shows part of this enlarged so that TAR's can be seen. WikiESP 039563 1730yardangsclose.jpg|Close-up of yardangs, as seen by HiRISE under HiWish program. Arrows point to sand ridges that are called "transverse aeolian ridges" (TAR's). Esp 037147 1430layers.jpg|Layers in depression in crater, as seen by HiRISE under HiWish program A special type of sand ripple called Transverse aeolian ridges, TAR's are visible and labeled. Location is Hellas Planitia in Noachis quadrangle. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「transverse aeolian ridges」の詳細全文を読む スポンサード リンク
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