  Chorus-like whistler-mode waves that are known to play a fundamental role in
driving radiation-belt dynamics are excited on the Large Plasma Device by the
injection of a helical electron beam into a cold plasma. The mode structure of
the excited whistler wave is identified using a phase-correlation technique
showing that the waves are excited through a combination of Landau resonance,
cyclotron resonance and anomalous cyclotron resonance. The dominant wave mode
excited through cyclotron resonance is quasi-parallel propagating, whereas wave
modes excited through Landau resonance and anomalous cyclotron resonance
propagate at oblique angles that are close to the resonance cone. An analysis
of the linear wave growth rates captures the major observations in the
experiment. The results have important implications for the generation process
of whistler waves in the Earth's inner magnetosphere.
