Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983s%26t....65..218p&link_type=abstract
Sky and Telescope, vol. 65, Mar. 1983, p. 218-220. Research supported by the Institute for Planetary Research Observatories.
Astronomy and Astrophysics
Astronomy
8
Mars Environment, Polar Caps, Polar Meteorology, Secular Variations, Space Observations (From Earth), Annual Variations, Carbon Dioxide Concentration, Climatology, Ice Environments, Mars Atmosphere, Viking Lander 1, Mars, Polar Regions, Diagrams, Astronomy, Popular, History, Ice, Telescopic Observations, Climate, Techniques, Procedure, Composition, Seasonal Variations, Carbon Dioxide, Ierne Region, Lemuria Region, Cecropia Region, Water, Vapor, Dust Storms, Chasma Boreale, Patterns, Rima Tenuis, Meteorology
Scientific paper
Long-term earth-based observations of the Martian north polar cap are discussed. Recent measurements of the retreat of the cap during the Martian spring and summer were made with a filar attached to the telescope lens. An unsteady retreat rate was detected, together with final cap sizes smaller than in recent decades. The smaller caps are contrasted with larger caps remaining during the summer in the 1960s. The data indicate that the spring thaw occurs in two phases: first the CO2 cap sublimes, followed by a late spring thaw of the water cap. It is suggested that short term climatic variations occur on Mars, and long-term observation procedures to provide verification are defined. Finally, the possibility that correlations exist between climatic variations on earth and Mars is mentioned.
Beish Jeff D.
Capen Charles F.
Parker Donald C.
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