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PSP_003141_1330_RED_abrowse-00-PCF-LXTT.jpgThe Dunes of Kaiser Crater (CTX Frame - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)114 visiteCaption NASA:"Image PSP_003141_1330 shows a Sand Dunefield in Kaiser Crater, a 210 Km (such as about 130 miles) wide Impact Basin in the Hellespontus Region of Mars.Winds have trapped massive quantities of Sand on the Floors of broad Craters in this Region.
The steepest slopes on each Dune, such as the Slip-Faces, point to the East indicating that the dominant wind direction in this part of the Dunefield is from West to East. Patches of seasonal frost can be seen in the low areas between the Dunes".
Nota Lunexit: noi non crediamo che che le aree ad albedo più elevata (e che appaiono di un bel color bianco/argento nel frame colorizzato) le quali sono chiaramente individuabili fra le dune sìano, come dice la NASA, "chiazze di brine ghiacciate".
O meglio: può darsi che esse lo sìano, così come è pure plausibile che si tratti di sabbie cristalline (ne abbiamo già incontrate nei Campi di Dune) o di porzioni di suolo libere dalle sabbie (e che magari evidenziano il "Martian Paving"...) MareKromiumOtt 08, 2010
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PSP_003141_1330_RED_abrowse-01-PCF-LXTT.jpgThe Dunes of Kaiser Crater (EDM - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)102 visiteThis EDM reveals smaller Secondary Dunes superimposed on the Surface of the large Dunes and even smaller Ripples that appear between and perpendicular to the Secondary Dunes. Avalanching or mass movement of sand has left deep scars on the Slip-face of the large dune in the upper left portion of the frame. This may indicate that the sand is not loose but is weakly cemented. MareKromiumOtt 08, 2010
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PSP_002728_1645_RED_abrowse.jpgThe Dunes of Herschel Crater (Saturated Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)100 visiteThis image shows Dunes on the floor of Herschel Crater. The Steep Faces (a.k.a.: "Slip-Faces") of the Dunes are oriented downwind, in the direction of their motion. One feature of particular interest is the dune-free area downwind of the Crater towards the right side of the frame. Some sand has been trapped in the Crater, but the Crater prevents the Dunes from migrating directly downwind. Sand Dunes form naturally as a result of the transport of sand by the wind.
The Dunes in this image are somewhat crescent-shaped, but are being extended and distorted downwind and merging with nearby Dunes; this complex behavior is common in Dunefields on Earth.
In the left side of the image the sand lies in sheets rather than well-defined Dunes. At high resolution, the Dunes' Surface are covered in small Ripples and Scallops, also shaped by the wind. MareKromiumOtt 08, 2010
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ESP_018820_2035_RED_abrowse.jpgLayered Bedrock (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)107 visitenessun commentoMareKromiumOtt 08, 2010
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ESP_018969_1950_RED_abrowse-PCF-LXTT.jpgSmall-scale Volcanic Activity in Tharsis (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)113 visitenessun commentoMareKromiumOtt 06, 2010
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ESP_018534_1985_RED_abrowse-PCF-LXTT1.jpgLava Flows at the base of Olympus Mons (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)109 visitenessun commentoMareKromiumOtt 06, 2010
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PSP_002070_2250_RED_browse-00~0.jpgPolygons in Utopia Planitia (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)122 visitenessun commentoMareKromiumOtt 04, 2010
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ESP_018665_1920_RED_abrowse.jpgLava Channel (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)89 visitenessun commentoMareKromiumOtt 04, 2010
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PSP_001936_1370_RED_abrowse-02.jpgUnnamed Crater in Terra Cimmeria (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)90 visitenessun commentoMareKromiumOtt 04, 2010
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PSP_002590_1765_RED_abrowse-00.jpgFine Layers in Juventae Chasma (CTX Frame - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)77 visitenessun commentoMareKromiumOtt 04, 2010
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PSP_002590_1765_RED_abrowse-01.jpgFine Layers in Juventae Chasma (EDM - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)73 visitenessun commentoMareKromiumOtt 04, 2010
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PSP_003253_1880_RED_abrowse-00.jpgUnnamed Crater with "Pedestal" (CTX Frame - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)74 visitenessun commentoMareKromiumOtt 04, 2010
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