Right Type Departmental Bulletin Paper

A satellite naturally becomes charged in space filled with collisionless plasma. The relaxation methods for charging have been studied for a long time. Charged satellites are subjected to Coulomb forces from other charged satellites. Besides, the charged satellite is subjected to Lorentz force from the Earth's magnetic field. Control of charging a satellite is a good method to control orbit and attitude of satellites since it has the potential to lead novel dynamics. In the present thesis, we analyze the attitude motion of electrical-charged satellites using Lorentz force caused by Earth's magnetic field. Attitude control methods using gravity gradient torque are conventionally applied to a number of satellites. However, we apply them for the mission keeping and changing the attitude to the orbital radius direction. The objective is to demonstrate the attitude dynamics with the Lorentz force and the gravity force for the attitude control using these forces. The Earth's magnetic field is assumed to be dipole approximately. We numerically and analytically demonstrate the attitude dynamics using the formulated equation of motion. We found that the amount of charge in the equation is important for stability and instability of the attitude motion. Furthermore, the equilibrium points change depending on the quantity. On the basis of such property, we investigate methods to control the attitude of the satellite by controlling the amount of the charging. For example, Lorentz force makes the attitude stable to the directions except for the orbital radius direction an