Todd R. Steven W.
نویسنده
چکیده
Images of Mars obtained using the Planetary Camera on the Hubble Space Telescope during 1990 and 1991 are described and analyzed. Multi-spectral images of Mars record the martian season between L~ = 348 and 60 corresponding to late winter and spring in the northern hemisphere. The wavelengths of these observations varied between 230 nm in the ultraviolet and 890 nm in the near infrared. We use these images to discuss atmospheric and polar phenomena, to constrain the aerosols and ozone in the martian atmosphere, and to compare surface albedo features within this data set as well as with previous observations. Our observations are consistent with a Mars which is quite different from the planet viewed by Viking. The atmosphere was clear, and there was little evidence of dust storms on the planet. Despite this major difference, the behaviors of condensate clouds and the recession of the north polar cap are consistent with those observed by Viking. The quality of the images produced by HST, even when Mars subtended less than 5 arc seconds, confirms the potential value of HST observations in providing continuous synoptic coverage of the planet.
منابع مشابه
Contrasting Views of Physicians and Nurses about an Inpatient Computer-based Provider Order-entry System
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