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| Titel |
Observations of Ionospheric Langmuir-waves Enhanced by Electron Precipitation |
| VerfasserIn |
Bjorn Gustavsson, Herbert Gunell, Hervé Lamy |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250150360
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| Publikation (Nr.) |
 EGU/EGU2017-14814.pdf |
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| Zusammenfassung |
| Incoherent scatter radar observations during auroral events regularly show strongly enhanced back-scatter from Langmuir-waves. In this presentation we show observations of significantly enhanced power in E-region plasma-lines. The observations show the altitude variation of the plasma-line power and frequency with 3 km altitude-resolution. One novel observation is that the back-scatter is just above a multiple of the electron gyro-frequency. This novel finding cannot be explained by the standard incoherent-scatter and electron transport theories. However, this frequency dependency is similar to the ionospheric responses to HF-radio-wave pumping. Electron-beam excited UH-waves converting to Langmuir-waves are suggested as a plausible explanation. |
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