Property of Electrostatic Ion-Cyclotron Waves and Ion Acoustic Waves and Ion Acoustic Waves in a Magnetic Field

By investigating the dispersion relation of electrostatic ion waves in a magnetic field, a linear coupling is found between electrostatic ion cyclotron waves and ion acoustic waves near the second harmonic ion cyclotron frequency. The coupling between the two modes are also detected experimentally in an argon plasma, which is nearly in accordance with the theoretical results.