Our research focuses on Solar-Terrestrial relations and the science behind space weather phenomena. Solar-Terrestrial science deals with physics that start from active processes on the Sun causing disturbances in the solar wind passing through the interplanetary space and impacting the space environment around the Earth and the ionized upper atmosphere. Space weather is a general term used to describe the impact on technological systems and humans on ground, in the atmosphere, and in space, also on long-term presence at the space station, and in the future on Moon and Mars. Our research utilizes space-based and ground-based observations as well as numerical simulations.