Abstract
Porcupine sounding rockets launched from Kiruna in March 1979 carried comprehensive payloads of field, wave and particle experiments. In addition, Xenon ion sources on an ejectable package separated from the main payload during flight. The effects of the Xe + beam as detected by the LF (f<16 kHz) wide-band electric field experiment are discussed. Of particular interest is the stimulation by the Xenon ions of ion-cyclotron harmonic waves covering the whole frequency range up to 16 kHz. These waves are usually linked to the local proton gyro-frequency but occasionally they are related to half that frequency. A possible generation mechanism based on the excitation of waves in the presence of a light minor ion is suggested.
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