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| Titel |
Quasi-periodic ELF/VLF wave emissions in the Earth's magnetosphere: comparison of satellite observations and modeling |
| VerfasserIn |
D. L. Pasmanik, E. E. Titova, A. G. Demekhov, V. Y. Trakhtengerts, O. Santolík, F. Jiricek, K. Kudela, M. Parrot |
| 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 ; 22, no. 12 ; Nr. 22, no. 12 (2004-12-22), S.4351-4361 |
| Datensatznummer |
250015095
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| Publikation (Nr.) |
 copernicus.org/angeo-22-4351-2004.pdf |
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| Zusammenfassung |
| We present the results of a case study of quasi-periodic (QP) ELF/VLF
hiss emissions detected on board
the Freja and Magion 5 satellites.
Detailed analysis of available QP events revealed certain specific
features of their dynamic spectra, which have not been reported
earlier.
In particular, we found an event with an increase in the frequency
drift rate during the generation of a single element of QP
emission, and an event with alteration of QP elements having different
frequency drift rates. Another event demonstrates the possible relationship
between QP hiss emissions and discrete VLF emissions.
Properties of QP events are
compared with parameters of energetic electrons and cold plasma, and other
available data.
Possible scenarios for the formation of these emissions are
discussed on the basis of self-consistent simulations of the cyclotron
instability, employing the information obtained experimentally. It is
shown that the generation regime of self-sustained pulsations can explain
consistently our data set. We show that our numerical model is
capable of explaining the mentioned specific features of the dynamic
spectrum of QP emissions.
Comparison of the modeling results with experimental data yields an
estimate for the parameters not measured directly.
Key words. Magnetospheric physics (plasma waves and instabilities;
energetic particles, precipitating; energetic particles,
trapped) |
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