Phobos-II results and the Martian magnetic field

Details Phobos-II results and the Martian magnetic field Phobos-II results and the Martian magnetic field

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990em%26p...48..183o&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 48, Feb. 1990, p. 183-186.

Computer Science

Interplanetary Spacecraft, Mars (Planet), Planetary Evolution, Planetary Magnetic Fields, Field Strength, Planetary Mantles, Planetary Structure

Scientific paper

The models of Martian planetary evolution of Orgzall and Franck (1988) are modified to account for magnetic-field observations obtained by the Soviet Phobos 2 spacecraft (Riedler et al., 1990). Phobos detected an active planetary dipole field of order 10 nT, tilted 65 + or - 15 deg against the rotation axis. This type of magnetic field is shown to be consistent with model M8, in which an initial thermal dynamo was fed by several energy sources during inner-core formation. After about 2.75 Gyr, a eutectic core composition was achieved; the gravitational contribution ended; and cooling and solidification sustained the dynamo with nearly constant output until the magnetic Reynolds number was violated and switchoff processes began. The Phobos observations indicate that the gradual disappearance of the magnetic field is not yet complete.

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