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| Titel |
Electron-cylotron maser radiation from electron holes: downward current region |
| VerfasserIn |
R. A. Treumann, W. Baumjohann, R. Pottelette |
| 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 ; 30, no. 1 ; Nr. 30, no. 1 (2012-01-13), S.119-130 |
| Datensatznummer |
250017168
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| Publikation (Nr.) |
 copernicus.org/angeo-30-119-2012.pdf |
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| Zusammenfassung |
| The electron-cyclotron maser emission theory from electron holes is
applied to holes generated in the downward current region of the aurora. It
is argued that the main background auroral kilometric radiation source may
still be located in the upward current region electron-ring (horseshoe)
distribution while the fine structure is caused by electron holes
predominantly in the downward current region. There the existence of electron
holes is well established and electron densities are high enough for
substantial maser growth rates. Trapping of radiation by the holes provides
strong amplification. Upward motion of holes favours the escape of radiation
both, from the holes and from the downward current region, into the upward current region.
Since upward and downward current regions always exist simultaneously, they are
acting in tandem in generating auroral kilometric radiation and its fine
structure by the same mechanism though in different ways. This mechanism
solves the long-standing problem of auroral kilometric radiation fine
structure. |
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