Calculation of the Initial Magnetic Field for Mercury’s Magnetosphere Hybrid Modelстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:Several types of numerical models are used to analyze the interactions of the solar wind flow with
Mercury’s magnetosphere, including kinetic models that determine magnetic and electric fields based on the
spatial distribution of charges and currents, magnetohydrodynamic models that describe plasma as a conductive
liquid, and hybrid models that describe ions kinetically in collisionless mode and represent electrons as a
massless neutralizing liquid. The structure of resulting solutions is determined not only by the chosen set of
equations that govern the behavior of plasma, but also by the initial and boundary conditions; i.e., their effects
are not limited to the amount of computational work required to achieve a quasi-stationary solution. In this
work, we have proposed using the magnetic field computed by the paraboloid model of Mercury’s magnetosphere
as the initial condition for subsequent hybrid modeling. The results of the model have been compared
to measurements performed by the Messenger spacecraft during a single crossing of the magnetosheath and
the magnetosphere. The selected orbit lies in the terminator plane, which allows us to observe two crossings
of the bow shock and the magnetopause. In our calculations, we have defined the initial parameters of the
global magnetospheric current systems in a way that allows us to minimize paraboloid magnetic field deviation
along the trajectory of the Messenger from the experimental data. We have shown that the optimal initial
field parameters include setting the penetration of a partial interplanetary magnetic field into the magnetosphere
with a penetration coefficient of 0.2.