File:Martian Dust Devil Trails.jpg

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Català: Imatge presa per la Sonda orbital d'exploració de Mart mostrant traces negres formades per remolins de pols creuant raigs de llum sobre la superfície de Mart. Els vòrtexs, que poden tenir fins a 8 km d'alçada, aixequen una fina capa de pols i deixen al descobert la sorra més densa i fosca.
English: This portion of a recent high-resolution picture from the HiRISE camera on board the Mars Reconnaissance Orbiter shows twisting dark trails criss-crossing light coloured terrain on the Martian surface. Newly formed trails like these had presented researchers with a tantalizing Martian mystery but are now known to be the work of miniature wind vortices known to occur on the red planet - Martian dust devils. Such spinning columns of rising air heated by the warm surface are also common in dry and desert areas on planet Earth. Typically lasting only a few minutes, dust devils becoming visible as they pick up loose red-coloured dust leaving the darker and heavier sand beneath intact. On Mars, dust devils can be up to 8 kilometres high. Dust devils have been credited with unexpected cleanings of Mars rover solar panels.
Français : Traces noires laissées par des tourbillons de poussière sur la surface de Mars. Ces traces ont longtemps questionné les planétologues, mais on sait aujourd'hui qu'elle sont dues à des tourbillons qui soulèvent une fine couche de poussière claire et laissent apparaître du sable, plus dense et plus sombre. De tels tourbillons existent aussi sur Terre dans les déserts et les zones sèches. Sur Mars, de tels tourbillons peuvent faire jusqu'à 8 km de haut (1 km sur Terre). De tels tourbillons ont parfois nettoyé les panneaux solaires des rovers martiens. Photo prise par la sonde Mars Reconnaissance Orbiter de la NASA.
Русский: Этот фотографический снимок Марсианской поверхности с перекрещивающимися закрученными темными дорожками на фоне светлого рельефа сделан с борта разведывательного орбитального спутника Марса (Mars Reconnaissance Orbiter) камерой высокого разрешения HiRISE. Образование таких дорожек, долго остававшееся одной из Марсианских загадок, ныне объяснено исследователями: это следы марсианских "пылевых дьяволов"-смерчей, которые часто образуются на поверхности красной планеты. Пылевые вихри, закручивающиеся вокруг столбов восходящих от раскалённой поверхности потоков воздуха, случаются часто и на Земле в засушливых и пустынных районах. Обычно длящиеся всего несколько минут, марсианские "пылевые дьяволы" втягивают с поверхности в вихревую воронку лёгкие сыпучие породы красного цвета, не захватывая более тёмные тяжелые пески, которые и формируют дорожки следов от смерчей. "Пылевые дьяволы" на Марсе могут достигать 8 км в высоту (земные - до 1 км). Считается, что панели солнечных батарей марсоходов избавлялись от загрязнений именно благодаря "пылевым дьяволам".
Date Taken on 24 August 2009
Source http://www.uahirise.org/ESP_014426_2070
Author NASA/JPL/University of Arizona
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(Reusing this file)		 http://www.uahirise.org/media/usage.php
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Latitude (centered): 26.7 °. Longitude (East): 62.8 °. Range to target site: 284.9 km. Original image scale range: 57.0 cm/pixel (with 2 x 2 binning) so objects ~171 cm across are resolved. Map projected scale: 50 cm/pixel and north is up. Map projection: EQUIRECTANGULAR. Emission angle: 0.3 °. Phase angle: 51.3 °. Solar incidence angle: 51 °, with the Sun about 39 ° above the horizon. Solar longitude: 326.8 °, Northern Winter.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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current11:14, 21 October 2009Thumbnail for version as of 11:14, 21 October 20092,560 × 1,920 (5.59 MB)Originalwana{{Information |Description={{en|1=This portion of a recent high-resolution picture from the HiRISE camera on board the Mars Reconnaissance Orbiter shows twisting dark trails criss-crossing light coloured terrain o

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