[P-EM17] Space Plasma Physics: Theory and Simulation

[PEM17-P07] Dynamics of energetic protons interacting with electromagnetic ion cyclotron waves

*Sekine Tomohiro¹ (1.Kyoto University )

We perform simulations of non-relativistic protons interacting with EMIC waves
in the Earth’s magnetic field. We find that the non-relativistic protons are trapped
and accelerated by waves. We also perform simulations of the motion of relativistic
protons in the Juvian magnetic field. We find highly efficient acceleration of the
protons by the EMIC waves. The efficiency is greater than that at the Earth.
In this acceleration process, the direction of proton velocity along the magnetic
field is reversed. We observe that this acceleration process is quite similar to the
acceleration process of relativistic electrons by whistler-mode chorus waves, called
Relativistic Turning Acceleration(RTA). We modify the nonlinear trapping theory
for the relativistic proton case. We confirm that our results satisfy the theoretical
conditions for RTA.