Inhibition of solar wind impingement on Mercury by planetary induction currents

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Mercury (Planet), Planetary Atmospheres, Planetary Magnetospheres, Solar Wind, Atmospheric Models, Dipole Moments, Flow Distortion, Stagnation Pressure, Solar Wind, Mercury, Magnetosphere, Pressure, Plasmas, Electrical Resistivity, Dipole Moments, Models, Radius, Magnetic Fields, Surface, Review, Electric Current

Scientific paper

Analytic methods are developed for taking into account finite planetary conductivity in modeling departures from equilibrium of a magnetospheric boundary caused by solar wind stagnation pressure variations. Using the lowest suggested value of the planetary dipole moment (2.4 x 10 to the 22nd G cu cm), it is estimated that a minimum pressure of about 38 P0 (where P0 is the external stagnation pressure in the steady state) is required to force the standoff distance down to the subsolar surface of Mercury if the pressure change persists for at least 1 day. This value is 4.3 times that which would be predicted if Mercury had no core, and it is larger than the maximum pressure predicted at Mercury's orbit (about 25 P0) on the basis of hourly averaged solar wind statistics at 1 AU.

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