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| This site may be down on Thursdays 
between 7:00 and 9:30 pm Central Time for maintenance. |  | Mars Exploration Rovers: MER Data Sets Online at GeosciencesMaintenance of MER archives is divided among the 
                        Geosciences, Imaging, Atmospheres, and NAIF Discipline 
                        Nodes of the PDS.  The list below shows only 
                        those MER data sets that reside at Geosciences. For 
                        MER data sets that do not reside at Geosciences, use the 
                        tools on the previous page or visit the other Discipline 
                        Node web sites via links in the orange bar at the bottom 
                        of the page. Back to main MER page Notes  
					Operations data are generated by MER Mission 
                    Operations. Science data are generated by the 
                    individual MER Payload Element Teams. EDR means Experiment Data Record, or raw data. 
                    RDR means Reduced Data Record, or derived data. Spirit is the first rover to arrive at Mars, also 
                    known as MER-A or MER-2.  Opportunity is the 
                    second rover, also known as MER-B or MER-1. A and B 
                    represent the rover missions in order of flight. 1 and 2 are 
                    the rover serial numbers. For FTP access to these data sets, please read 
                    Anonymous FTP Access.    |