The Mars surface environment and solar array performance

January, 2010, marked the 6th anniversary for MER. This also marked the completion of more than three Martian years of solar array operation on Mars. During the spring of 2010, the MER rovers broke the RTG powered Viking Lander record for robotic operations on the Mars surface. Not only has a wealth of scientific information been obtained from MER but also a large quantity of data regarding factors that impact solar array performance. These include measurement of atmospheric dust, i.e., the atmospheric tau value. Additionally, dust buildup and removal from the solar array surfaces has been tracked. It is expected that the data from the rovers will enhance the prediction of future Mars surface solar array performance. Seasonal and annual trends have been identified. The results of these parameter analyses will be presented to assist in the design of future Mars surface solar power systems, both rover and stationary.