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

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Abstract

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. © Author(s) 2011.

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Treumann, R. A., Nakamura, R., & Baumjohann, W. (2011). A model of so-called “zebra” emissions in solar flare radio burst continua. Annales Geophysicae, 29(9), 1673–1682. https://doi.org/10.5194/angeo-29-1673-2011

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