Spectrograms of pearl (Pc 1) micropulsations show dotted rising tones. It is suggested here that the dot structure is due to interference between the two components of a double tone or ‘hook.’ The observed dot structure could be produced by a nonconvective cyclotron instability of protons of about 100-kev energy and 60° pitch angle.
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R. L. Dowden (1968) studied this question.
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