Possible displacement of Mercury's dipole

Details Possible displacement of Mercury's dipole Possible displacement of Mercury's dipole

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.2115n&link_type=abstract

Journal of Geophysical Research, vol. 84, May 1, 1979, p. 2115-2117.

Physics

Magnetic Dipoles, Magnetic Moments, Magnetospheric Instability, Mercury (Planet), Planetary Magnetic Fields, Geomagnetism, Interplanetary Spacecraft, Least Squares Method, Radii, Solar Position, Mercury, Dipole Moments, Observations, Magnetic Properties, Magnetosphere, Sun, Magnetic Fields, Spherical Harmonic Analysis

Scientific paper

Earlier attempts to model the Hermean magnetospheric field based on a planet-centered magnetic multipole field have required the addition of a quadrupole moment to obtain a good fit to space vehicle observations. In this work an equally satisfactory fit is obtained by assuming a null quadrupole moment and least squares fitting of the displacement of the planetary dipole from the center of the planet. A best fit is found for a dipole displacement from the planet center of 0.033 Mercury radii away from the solar direction, 0.025 Mercury radii toward dawn in the magnetic equatorial plane, and 0.189 Mercury radii northward along the magnetic dipole axis. Therefore the presence of a magnetic quadrupole moment is not ruled out.

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