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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 29, issue 9
Ann. Geophys., 29, 1673–1682, 2011
https://doi.org/10.5194/angeo-29-1673-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 29, 1673–1682, 2011
https://doi.org/10.5194/angeo-29-1673-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 29 Sep 2011

Regular paper | 29 Sep 2011

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

R. A. Treumann1,2,*, R. Nakamura3, and W. Baumjohann3 R. A. Treumann et al.
  • 1Department of Geophysics and Environmental Sciences, Munich University, Munich, Germany
  • 2Department of Physics and Astronomy, Dartmouth College, Hanover NH 03755, USA
  • 3Space Research Institute, Austrian Academy of Sciences, Graz, Austria
  • *visiting: International Space Science Institute, Bern, Switzerland

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.

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