Magnetic Field Measurements near Mars

Science  10 Sep 1965:
Vol. 149, Issue 3689, pp. 1241-1242
DOI: 10.1126/science.149.3689.1241


During the encounter between Mariner IV and Mars on 14-15 July, no magnetic effect that could be definitely associated with the planet was evident in the magnetometer data. This observation implies that the Martian magnetic dipole moment is, at most, 3 x 10-4 times that of the earth.