| Piú viste - Mariner, Viking & MGS's Maps & Mars in the '70s |
ZE-I-Viking1-p137b.jpgColor snap-shots from Viking 1 (7)84 visite"...In the course of the Martian Year an important surface change was observed at the Viking 1 site. During the Winter months a thin layer of frost formed. This is documented by comparing two black and white pictures, the first taken early in the mission in late Martian Summer and the second taken months later in late Martian Winter.
Patches of receding frost were visible in the 2nd picture. During the height of Winter, frost probably covered the entire surface.
This picture is a color image of the frost, looking across the spacecraft. The colors purposely have been distorted slightly to enhance color contrast.
The frost persists at temperatures higher than those required for frozen Carbon Dioxide (dry ice).
It may be Water Ice or a Carbon Dioxide clathrate, a crystalline mixture of H2O and CO2".
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ZE-I-Viking1-p133a.jpgColor snap-shots from Viking 1 (1)83 visite"...As it has been already discussed in the past, the problems in reconstructing the (true) colors of the Martian Surface and Atmosphere are formidable.
It would be nice to present a folio of color pictures with the unqualified comment that these are the (Real) "Colors of Mars". But, after more than a year (many more, now) of analysis, it becomes clear that the situation will never become so simple.
In order to correct for the out of band spectral leaks in the color filters within the camera it is necessary to have access to both a color and an infrared (JR) picture taken at the same time. Only in that way can the IR contributions to the visible color, a result of camera filter design, be assessed.
For the many color pictures taken without an IR companion detailed calibration is not possible. Instead, the three visible channels-blue, green, and red-are balanced on the assumption that there are no out of band contributions..." (continua)
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ZE-I-VikingLander_1-MF2.jpgSmall "Trench" in Chrise Planitia (Natural Colors; credits: Dr M. Faccin - Lunexit Team)82 visitenessun commentoMareKromium
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ZE-I-Viking1-Oppy-2.jpgMartian Clouds, from Viking 1 until "Oppy" (an Image-Mosaic by Dr M. Faccin)81 visitenessun commentoMareKromium
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ZH-Viking_Lander_2-MF2.jpgThe Rocky Landscape of Utopia Planitia (Natural - but slightly enhanced - Colors; credits: Dr M. Faccin - Lunexit Team)79 visitenessun commentoMareKromium
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ZE-I-Viking1-p135b.jpgColor snap-shots from Viking 1 (5)78 visitenessun commento
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ZE-I-Viking2-p141b.jpgFrom the "Viking Archive" - Viking 2: Sunrise (2)78 visitenessun commento
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O-Mariner9-01.jpgMars from Mariner 9: Craterland...78 visitenessun commento
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O-Mariner9-02.jpgMars from Mariner 9: Olympus, alias Nix Olimpica77 visitenessun commento
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ZD-VikingLander1-MF1.jpgChrise Planitia (Natural Colors - Sx - and Natural but enhanced Colors - Dx; credits: Dr M. Faccin - Lunexit Team)77 visitenessun commentoMareKromium
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N-Mariner4-69.jpgGlobal Sand&Dust-storm from Mariner 476 visitenessun commento
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ZE-I-Viking1-p133c.jpgColor snap-shots from Viking 1 (3)75 visite"...The scene has a reddish or orangeish cast. Figure (2) is constructed by incorporating data from an accompanying IR picture and using the spacecraft's test charts, in this way accounting for out of band contributions and atmospheric colorations.
The scene is shown as it might appear "on Earth". For example, if you could pick up one of the boulders and transport it to your back yard, this is the color you would observe. Note that, relative to figure (1), the reddish tint is subdued, replaced with a brown hue.
Figure (3) shows the scene as it would appear "on Mars". The yellowish cast of Sunlight filtering through the atmospheric dust imparts a similar yellowish hue to the entire scene".
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