| Risultati della ricerca nelle immagini - "frost" |
Craters-Unnamed_Crater-South_Polar_Regions-PIA03921-PCF-LXTT.jpgUnnamed South Polar Defrosting Crater (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)59 visitenessun commentoMareKromium
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Craters-Unnamed_Defrosting_Crater-PIA03921-00.jpgUnnamed Defrosting Crater (Original NASA/MGS/MSSS b/w Frame)68 visiteCaption NASA originale:"This MGS-MOC image shows a Surface in the South Polar Region, covered by CO2 Frost. In this springtime scene, the Frost has begun to sublime so that Sandy Surfaces exhibit an abundance of Dark Spots. The circular depression is probably the remains of an Impact Crater. In summer, the Spotted Surfaces in this image would be darker than their surroundings, because they are patches of Windblown Sand".
Location near: 67,6° South Lat. and 254,3° West Long.
Image width: ~3 Km (~1,9) mi
Illumination from: upper left
Season: Southern Spring
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Craters-Unnamed_Defrosting_Crater-PIA03921-01.jpgUnnamed Defrosting Crater (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)227 visiteCaption NASA originale:"This MGS-MOC image shows a Surface in the South Polar Region, covered by CO2 Frost. In this springtime scene, the Frost has begun to sublime so that Sandy Surfaces exhibit an abundance of Dark Spots. The circular depression is probably the remains of an Impact Crater. In summer, the Spotted Surfaces in this image would be darker than their surroundings, because they are patches of Windblown Sand".
Location near: 67,6° South Lat. and 254,3° West Long.
Image width: ~3 Km (~1,9) mi
Illumination from: upper left
Season: Southern SpringMareKromium
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Dunes-PIA03291-01.jpgDefrosted Dunes (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)152 visiteImage information: VIS instrument;
Latitude: 66,6° South;
Longitude: 37,0° East;
Resolution: 34 meter/pixel.MareKromium
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ESP_016280_2655_RED_abrowse.jpgMartian Tears... (possible Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)65 visitenessun commentoMareKromium
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ESP_023938_1210-PCF-LXTT-00.jpgDefrosting Southern Gully and Dunes (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)201 visiteMars Local Time: 14:30 (early afternoon)
Coord. (centered): 58,5° South Lat. and 305,3° East Long.
Spacecraft altitude: 251,3 Km (such as about 157,1 miles)
Original image scale range: 25,1 cm/pixel (with 1 x 1 binning) so objects ~ 75 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 1,9°
Phase Angle: 65,1°
Solar Incidence Angle: 64° (meaning that the Sun is about 26° above the Local Horizon)
Solar Longitude: 355,6° (Northern Winter)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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ESP_024428_2605-PCF-LXTT-00a.jpgFeatures of the Defrosting North Polar Erg (CTX Frame "A" - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)189 visiteMars Local Time: 13:17 (early afternoon)
Coord. (centered): 80,2° North Lat. and 217,1° East Long.
Spacecraft altitude: 317,6 Km (such as about 198,5 miles)
Original image scale range: 63,5 cm/pixel (with 2 x 2 binning) so objects ~ 1 mt and 91 cm across are resolved
Map projected scale: 50 cm/pixel
Map projection: POLAR STEREOGRAPHIC
Emission Angle: 2,4°
Phase Angle: 76,3°
Solar Incidence Angle: 75° (meaning that the Sun is about 15° above the Local Horizon)
Solar Longitude: 14,3° (Northern Spring)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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ESP_024428_2605-PCF-LXTT-00b.jpgFeatures of the Defrosting North Polar Erg (CTX Frame "B" - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)184 visiteMars Local Time: 13:17 (early afternoon)
Coord. (centered): 80,2° North Lat. and 217,1° East Long.
Spacecraft altitude: 317,6 Km (such as about 198,5 miles)
Original image scale range: 63,5 cm/pixel (with 2 x 2 binning) so objects ~ 1 mt and 91 cm across are resolved
Map projected scale: 50 cm/pixel
Map projection: POLAR STEREOGRAPHIC
Emission Angle: 2,4°
Phase Angle: 76,3°
Solar Incidence Angle: 75° (meaning that the Sun is about 15° above the Local Horizon)
Solar Longitude: 14,3° (Northern Spring)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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ESP_024428_2605-PCF-LXTT-00c.jpgFeatures of the Defrosting North Polar Erg (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)189 visiteMars Local Time: 13:17 (early afternoon)
Coord. (centered): 80,2° North Lat. and 217,1° East Long.
Spacecraft altitude: 317,6 Km (such as about 198,5 miles)
Original image scale range: 63,5 cm/pixel (with 2 x 2 binning) so objects ~ 1 mt and 91 cm across are resolved
Map projected scale: 50 cm/pixel
Map projection: POLAR STEREOGRAPHIC
Emission Angle: 2,4°
Phase Angle: 76,3°
Solar Incidence Angle: 75° (meaning that the Sun is about 15° above the Local Horizon)
Solar Longitude: 14,3° (Northern Spring)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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EXOGEOLOGY-002-A.jpgMartian and Terrestrial Permafrost: a Visual Comparison55 visitenessun commentoMareKromium
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EXOGEOLOGY-002.jpgVastitas Borealis60 visiteLa distesa raffigurata nella foto è caratterizzata dalla presenza di un suolo irregolare, ricco di dossi intramezzati da mini avvallamenti.
Sulla Terra, questo tipo di terreno viene detto Permafrost: presenta - come legante - dell'acqua ghiacciata e si estende su regioni o aree in cui dominano temperature così basse da poterlo mantenere congelato per almeno 2 anni consecutivi.
Le gobbette a geometria poligonale visibili in foto rappresentano una forma geomorfologica tipica detta "Patterned Ground". Esse si formano in seguito al congelamento dei fluidi contenuti nel regolite (nota: ---> il regolite è uno strato di materiale sciolto e di granulometria eterogenea il quale copre uno strato di roccia compatta - cd. "Roccia Madre". Il regolite è presente sulla Terra, sulla Luna e, a quanto pare, anche su Marte e su alcuni asteroidi (e, ragionevolmente, su tutti i Pianeti di "Tipo Terrestre" nonchè sulle lune dei Giganti Gassosi).
L'origine del regolite sulla Terra è attribuita alla degradazione meteorica del suolo ed all'azione (congiunta) degli organismi.
Sui corpi senza atmosfera - o con atmosfera ridotta/rarefatta - invece, il regolite si origina dalla aggregazione gravitazionale di residui derivati dall'impatto di bolidi e comete con la superficie del Corpo Celeste di riferimento. Detta aggregazione produce una superficie a strati, caratterizzati da una granulometria decrescente, dal basso verso l'alto).
In effetti, quando l’acqua congela, si ha un aumento del suo volume pari al 10% (circa) il quale è dovuto all’instaurarsi di legami “a ponte di idrogeno” tra le molecole del ghiaccio.
L’incremento volumetrico comporta uno sforzo plastico sul terreno il quale, di conseguenza, si deforma generando questo caratteristico assetto.MareKromium
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North_Polar_Features-Dunes-MGS-03.JPGNorth Polar Dunes (Original NASA/MGS/MSSS b/w Frame)67 visiteCaption NASA originale:"This MGS-MOC image shows dunes covered with a seasonally-deposited layer of solid Carbon Dioxide (CO2) in the North Polar Region of Mars. The dark spots indicate areas where the CO2 frost has begun to change, either by being sublimed away, or by becoming rougher or coarser-grained, such that it appears darker than surrounding frost. Over the course of the Spring season, the frost will be completely removed and the dark sands that make up the dune field will be visible by Summer".
Location near: 77,7° North; 41,7° West
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Spring
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