Other
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sprt.rept..223a&link_type=abstract
In its Space Photovoltaic Research and Technology, 1989 p 223-254 (SEE N91-19182 11-20)
Other
Energy Technology, Landing Sites, Mars Surface, Photovoltaic Cells, Photovoltaic Conversion, Solar Arrays, Solar Energy Conversion, Space Exploration, Climatology, Insolation, Irradiance, Lunar Surface, Planetary Geology, Planetary Temperature, Solar Radiation, Solar Temperature, Temperature Sensors, Viking Lander Spacecraft
Scientific paper
NASA, through Project Pathfinder, has put in place an advanced technology program to address future needs of manned space exploration. Included in the missions under study is the establishment of outposts on the surface of Mars. The Surface Power program in Pathfinder is aimed at providing photovoltaic array technology for such an application (as well as for the lunar surface). Another important application is for unmanned precursor missions, such as the photovoltaic-power aircraft, which will scout landing sites and investigate Mars geology for a 1 to 2 year mission without landing on the surface. Effective design and utilization of solar energy depend to a large extent on adequate knowledge of solar radiation characteristics in the region of solar energy system operation. The two major climatic components needed for photovoltaic system designs are the distributions of solar insolation and ambient temperature. These distributions for the Martian climate are given at the two Viking lander locations but can also be used, to the first approximation, for other latitudes. One of the most important results is that there is a large diffuse component of the insolation, even at high optical depth, so that solar energy system operation is still possible. If the power system is to continue to generate power even on high optical opacity days, it is thus important that the photovoltaic system be designed to collect diffuse irradiance as well as direct. In absence of long term insolation and temperature data for Mars, the data presented can be used until updated data are available. The ambient temperature data are given as measured directly by the temperature sensor; the insolation data are calculated from optical depth measurements of the atmosphere.
Appelbaum Joseph
Landis Geoffrey A.
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