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Context: The stellar wind and the interplanetary magnetic field modify thetopology of planetary magnetospheres. Consequently, the hazardous effect of thedirect exposition to the stellar wind, for example regarding the integrity ofsatellites orbiting the Earth or the habitability of exoplanets, depend uponthe space weather conditions. Aims: The aim of the study is to analyze theresponse of an Earth-like magnetosphere for various space weather conditionsand interplanetary coronal mass ejections. The magnetopause stand off distance,open-close field line boundary and plasma flows towards the planet surface arecalculated. Methods: We use the MHD code PLUTO in spherical coordinates toperform a parametric study regarding the dynamic pressure and temperature ofthe stellar wind as well as the interplanetary magnetic field intensity andorientation. The range of the parameters analyzed extends from regular toextreme space weather conditions consistent with coronal mass ejections at theEarth orbit for the present and early periods of the Sun main sequence. Inaddition, implications of sub-Afvenic solar wind configurations for the Earthand exoplanet magnetospheres are analyzed. Results: The direct precipitation ofthe solar wind at the Earth day side in equatorial latitudes is extremelyunlikely even during super coronal mass ejections. On the other hand, for earlyevolution phases along the Sun main sequence once the Sun rotation rate was atleast $5$ times faster (< 440 Myr), the Earth surface was directly exposed tothe solar wind during coronal mass ejections. Nowadays, satellites at High,Geosynchronous and Medium orbits are directly exposed to the solar wind duringcoronal mass ejections, because part of the orbit at the Earth day side isbeyond the nose of the bow shock.

MHD study of planetary magnetospheric response during extreme solar wind conditions: Earth and exoplanet magnetospheres applications