The magnetic field of Mercury. I

Details The magnetic field of Mercury. I The magnetic field of Mercury. I

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.2708n&link_type=abstract

Journal of Geophysical Research, vol. 80, July 1, 1975, p. 2708-2716.

Physics

67

Magnetic Field Configurations, Magnetospheric Electron Density, Mariner Venus-Mercury 1973, Mercury (Planet), Planetary Magnetic Fields, Planetary Magnetospheres, Solar Wind, Bow Waves, Chapman-Ferraro Problem, Dipole Moments, Dynamo Theory, Least Squares Method, Magnetic Moments, Magnetopause, Neutral Sheets, Spherical Harmonics

Scientific paper

An updated analysis and interpretation are presented of the magnetic field observations obtained during the Mariner 10 encounter with the planet Mercury on March 29, 1974. The combination of data relating to position of the detached bow shock wave and magnetopause and the geometry and magnitude of the magnetic field within the magnetosphere-like region surrounding Mercury lead to the conclusion that an internal planetary field exists with dipole moment approximately 5.1 times 10 to the 22nd G per cu cm. The dipole axis has a polarity sense similar to that of earth and is tilted 7 deg from the normal to Mercury's orbital plane. The magnetic field observations reveal a significant distortion of the modest Hermean field by the solar wind flow and the formation of a magnetic tail and neutral sheet which begins close to the planet on the night side. Presently, an active dynamo mechanism in the planetary interior appears to be favored in the interpretation of the field origin.

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