The Solar Wind at Mars

http://science.nasa.gov/headlines/y2001/ast31jan_1.htm

This is an article put out by Nasa on January 31 2007 that details the effect that the solar wind is having on mars, due to the lack of a magnetosphere. The article discusses how scientists believe that whatever atmosphere used to exist on mars was litterally "blown away" due to the strong forces of the solar wind, which the earth is shielded from by the magnetosphere.