Interaction Between A Fast Plasmoid and the Solar Wind

In this note a kinetic interaction process between a fast plasmoid ejected by the Sun, which represents another form of CME, and the background solar wind in the corona is discussed. We consider a system which consists of the plasmoid ions moving faster than the solar wind. We are interested in the time evolution of the ion distribution functions due to wave–particle interactions. Simulation results show that both perpendicular and parallel temperatures of the solar wind ions increase when the relative velocity between the plasmoid and the solar wind is sufficiently greater than the Alfvén velocity of the plasmoid ions. We suggest that this process is significant for the heating and acceleration of the solar wind in the low-heliographic latitude regions near the Sun.