Main Electron Resonance of a Bounded Plasma at High Magnetic Fields

The main electron resonance, whose behavior up to ${\omega }_{\mathrm{ce}}\text{/ω\hspace{0.17em}≃\hspace{0.17em}1}$ is well understood, has now been experimentally followed up to high magnetic fields ${\mathrm{(\omega }}_{\mathrm{ce}}\text{/ω\hspace{0.17em}≃\hspace{0.17em}50)}$ in a very quiet plasma. There is very good agreement with recent theoretical predictions based on the hydrodynamical description of a bounded, hot, electron‐ion plasma, thereby confirming, for the values of the plasma parameters involved, the validity of the theory used.