ИСТИНА

We use Geant4 software package (Agostinelli S. et al. 2003) to study the effects of the interaction of solar wind charged particles with hermean magnetosphere and surface. The capabilities of Geant4 make it possible to take into account the inhomogeneous chemical composition of the regolith, the presence of a magnetosphere and to model the interaction of charged particles with the regolith in a wide energy range (over 1 keV for protons). Within the framework of this project, we have written a program code for calculation in Geant4, containing a model of Mercury with a uniform chemical composition. We have connected the paraboloid model of hermean magnetospheric magnetic field to the geometric model of Mercury [1]. A series of test calculations of the trajectories of protons with an energy range of 1 keV - 10 MeV in the magnetic field of Mercury has been carried out. We have obtained maps of the angular and spatial distribution of primary protons on the hermean surface and maps of the spatial distribution of Na23 ions sputtered from the soil. The performed calculations made it possible to work out a technique for modeling the interaction of charged particles with a magnetic field of a complex configuration. In addition, we have carried out calculations for several states of the magnetosphere, including for an extremely compressed magnetic field, which allowed us to analyze the influence of its configuration on the features of the distribution of protons over the surface of the Mercury model and thus on the distribution of sputtered Na23 ions. This work is carried out under RFBR grant no 21-52-12025. [1] Igor I. Alexeev, Elena S. Belenkaya, James A. Slavin, Haje Korth, Brian J. Anderson, Daniel N. Baker, Scott A. Boardsen, Catherine L. Johnson, Michael E. Purucker, Menelaos Sarantos, Sean C. Solomon, Mercury’s magnetospheric magnetic field after the first two MESSENGER fly- bys, Icarus, Volume 209, Issue 1, 2010, Pages 23-39, ISSN 0019-1035, https://doi.org/10.1016/j.icarus.2010.