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  • 1
    facet.materialart.
    Unknown
    Time variation of Martian regional contrasts. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observations of contrast changes in blue light on Mars in 1969 and 1971 are presented. Seasonal effects evidently can be evaluated from these data, although nonseasonal effects are also present. A diurnal variation is noted for certain features during both apparitions. This variation cannot be fully accounted for without considering meteorological effects. An example of a contrast reversal in ultraviolet light is presented. The suggestion is made that during the Martian season covered herein, variability of the bright areas controlled the apparent contrasts observed.
    Keywords: SPACE SCIENCES
    Type: Icarus; 20; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A new look at the Martian 'violet haze' problem. II - 'Blue clearing' in 1969. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The 1969 apparition of Mars has been extensively observed by the International Planetary Patrol Program. Using this material, the distribution of blue clearing in phase angle has been examined for four Martian bright area-dark area pairs. Arabia-Syrtis Major showed a smooth variation with a maximum at opposition. Zephyria-Mare Cimmerium showed a similar behavior except for a period around 20 deg before opposition. Memnonia-Mare Sirenum showed a rather steady decline from 20 deg before opposition to 30 deg after opposition, except for an increase around 11 deg after opposition. Xanthe-Nilokeras showed a rather erratic behavior.
    Keywords: SPACE SCIENCES
    Type: Icarus; 18; Jan. 197
    Format: text
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  • 3
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    A new look at the Martian 'violet haze' problem. I - Syrtis Major-Arabia, 1969. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Photographic and photoelectric data obtained in 1969 have been combined to provide a relatively accurate and complete description of the so-called blue clearing phenomenon on Mars. The dark feature Syrtis Major and its surroundings are the subject of the present study. A series of comparison images of Mars in blue light was assembled to form a scale of blue clearing. The scale steps represent about the smallest readily recognizable difference in apparent contrast. The relationship between the scale number and the brightness of Syrtis Major as compared to its surroundings has been established microphotometrically. International Planetary Patrol Program photographs in blue light having Syrtis Major near the center of the disk were compared to the scale and assigned a value. The results indicate that the blue clearing of Syrtis Major was strongly dependent upon phase angle in 1969, reaching a maximum at opposition. Syrtis Major displayed a diurnal variation of blue clearing near opposition. This variation disappeared away from opposition.
    Keywords: SPACE SCIENCES
    Type: Icarus; 16; Apr. 197
    Format: text
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  • 4
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    Brief history of the Martian 'violet haze' problem. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A brief but thorough survey of the literature on the Martian 'violet haze' problem is presented. It is evident that both the normal lack of contrast of the surface features in violet light and their occasional appearance are phenomena intrinsic to Mars. Models involving simple uniform layers of scattering or absorbing materials are inadequate to account for the observations. We suggest that the role of haze has historically been misinterpreted. The blank disk of Mars in violet light occurs when the atmosphere is relatively free of haze. The formation of optically thin white hazes over the bright areas increases the contrast and produces 'blue clearing.'
    Keywords: SPACE SCIENCES
    Type: Reviews of Geophysics and Space Physics; 10; Nov. 197
    Format: text
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