Abstract
The primary objective of ERG project is a better understanding the acceleration mechanism of the energetic particles in the radiation belt. An important part of the science mission is to investigate the role of Pc 5 pulsations in frequency band between 1.67 and 6.67 mHz for transporting the energetic electrons. ERG will provide the simultaneous measurements of three-dimensional plasma distributions covering a wide range from eV to MeV, electric and magnetic fields, and plasma waves, near the equatorial plane where the electron accelerations can occur. These measurements might demonstrate the relationship between Pc 5 pulsations and the transportation of electrons. This paper shows the examination of Pc 5 pulsations measured by the THEMIS spacecrafts as the preliminary preparation of the ERG observation. By combining both the five THEMIS spacecrafts and the ground-based magnetometer, we can find the spatial distribution of Pc 5 pulsation in the inner magnetosphere. Particularly, the polarization of Pc 5 pulsation is identified by the in-situ magnetic and electric field measurements. With a focus on the Pc 5 pulsation, we also present the scientific effort by ERG to the understanding of the inner magnetosphere dynamics.
