A Possible Cause of Magnetic Anomalies on the Southern Martian Hemisphere

From the topology of a synthetic aurora map,we propose a mechanism for the magnetic anomalies on the southern martian hemisphere,i.e.,impacts by asteroids when the dynamo is active.The quasi concentric circles of aurora suggest that there are two-to-three convectional cells for each impact.The whole synthetic aurora is induced by three major impacts of asteroids.The east-west lineation features of crust magnetizations are due to the east-west trending locations of three impacts.The alternatively changed sign of crust magnetization originates from the alternatively changed Bow direction on the tops of adjacent convectional cells.