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| Titel |
A model of so-called "Zebra" emissions in solar flare radio burst continua |
| VerfasserIn |
R. A. Treumann, R. Nakamura, W. Baumjohann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 9 ; Nr. 29, no. 9 (2011-09-29), S.1673-1682 |
| Datensatznummer |
250017097
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1673-2011.pdf |
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| Zusammenfassung |
| 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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