A model of so-called "Zebra" emissions in solar flare radio burst continua

Treumann, R. A.; Nakamura, R.; Baumjohann, W.

A simple mechanism for the generation of electromagnetic "Zebra" pattern emissions is proposed. "Zebra" bursts are regularly spaced narrow-band radio emissions on the otherwise broadband radio continuum emitted by the active solar corona. The mechanism is based on the generation of an ion-ring distribution in a magnetic mirror geometry in the presence of a properly directed field-aligned electric potential field. Such ion-rings or ion-conics are well known from magnetospheric observations. Under coronal conditions they may become weakly relativistic. In this case the ion-cyclotron maser generates a number of electromagnetic ion-cyclotron harmonics which modulate the electron maser emission. The mechanism is capable of switching the emission on and off or amplifying it quasi-periodically which is a main feature of the observations.

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Treumann, R. A. / Nakamura, R. / Baumjohann, W.: A model of so-called "Zebra" emissions in solar flare radio burst continua. 2011. Copernicus Publications.

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