Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9233899a&link_type=abstract
Proposed for presentation at the 43rd Congress of the International Astronautical Federation, Washington, DC, 28 Aug. - 5 Sep. 1
Astronomy and Astrophysics
Astronomy
Diffuse Radiation, Dust Storms, Mars Atmosphere, Mars Surface, Optical Thickness, Photovoltaic Cells, Solar Arrays, Solar Collectors, Solar Radiation, Accumulators, Albedo, Insolation, Northern Hemisphere, Summer, Sunlight
Scientific paper
Missions to Mars will require electric power. A leading candidate for providing power is solar power produced by photovoltaic arrays. To design such a power system, detailed information on solar-radiation availability on the Martian surface is necessary. The variation of the solar radiation on the Martian surface is governed by three factors: (1) variation in Mars-Sun distance; (2) variation in solar zenith angle due to Martian season and time of day; and (3) dust in the Martian atmosphere. A major concern is the dust storms, which occur on both local and global scales. However, there is still appreciable diffuse sunlight available even at high opacity, so that solar array operation is still possible. Typical results for tracking solar collectors are also shown and compared to the fixed collectors. During the Northern Hemisphere spring and summer the isolation is relatively high, 2-5 kW-hr/sq m-day, due to the low optical depth of the Martian atmosphere. These seasons, totalling a full terrestrial year, are the likely ones during which manned mission will be carried out.
Appelbaum Joseph
Landis Geoffrey A.
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