Abstract
It is shown analytically and by means of plasma numerical simulations that the large amplitude hydrogen cyclotron waves on auroral field lines near 1 RE altitude may be excited by upward flowing ion beams rather than by field‐aligned currents. The large amplitude electric field near ω ≈ 0 is identified as the ion gyro‐harmonic waves on the beam ions observed in the frame of background ions and, therefore, such a wave exists only when the instability is excited by ion beams. Both the theory and numerical simulations support the conclusion.
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