Thermal core-mantle coupling in an early lunar dynamo: Implications for a global magnetic field and magnetosphere of the early Moon

Details Thermal core-mantle coupling in an early lunar dynamo: Implications for a global magnetic field and magnetosphere of the early Moon Thermal core-mantle coupling in an early lunar dynamo: Implications for a global magnetic field and magnetosphere of the early Moon

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3624202t&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 24, CiteID L24202

Physics

3

Planetary Sciences: Solar System Objects: Moon (1221), Geomagnetism And Paleomagnetism: Dynamo: Theories And Simulations, Planetary Sciences: Solid Surface Planets: Magnetic Fields And Magnetism, Planetary Sciences: Solid Surface Planets: Magnetospheres (2756), Planetary Sciences: Solid Surface Planets: Orbital And Rotational Dynamics (1221)

Scientific paper

A theoretical model suggests a short-lived lunar dynamo driven by a mantle overturn forming crustal thickness dichotomy, while the lunar paleomagnetic data and crustal magnetic fields suggest both of presence and absence of a global magnetic field of the Moon ˜4 billion years (Gyr) ago. Here we carry out numerical simulations of a possible lunar dynamo, including effects of mantle overturn on heat flux heterogeneity at the core-mantle boundary. As a result, the surface field intensity of the lunar dynamo is about 100 nT. In this case, a lunar magnetosphere could be present with a sunward size of 1.4 times the Moon's radius. Considering the 4.6 Gyr orbit evolution of the Moon, the magnetic field intensity and the magnetosphere size could be larger, suggesting the lunar crustal magnetization acquired in the ancient dynamo field.

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