Electromagnetic ion cyclotron waves related to Dipolarization front

Abstract:

While the features of the depolarization fronts in the plasma sheet have been paid much attention, it has been found in the simulation that there are strong electromagnetic ion cyclotron wave activities in the plasma sheet boundary layer. We have searched through all the dipolarization front cases from 2009 to 2012 and found several good cases using two-satellite observation of THEMIS. Wave activities were found off the equator, prior to the arrival of depolarization front in the center plasma sheet. One good case was carefully studied and an electron-beam feature has been found. Polarization analysis of the wave shows that it is most likely to be current-driven electromagnetic ion cyclotron waves and we are now trying to match it with results from WHAMP (Waves in Homogeneous Anisotropic Magnetized Plasma).