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| Titel |
ULF wave measurements onboard the Interball auroral probe |
| VerfasserIn |
S. Perraut, A. Roux, F. Darrouzet, C. Villedary, M. Mogilevsky, F. Lefeuvre |
| 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 ; 16, no. 9 ; Nr. 16, no. 9, S.1105-1116 |
| Datensatznummer |
250013452
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| Publikation (Nr.) |
 copernicus.org/angeo-16-1105-1998.pdf |
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| Zusammenfassung |
The IESP experiment implemented onboard the
Interball auroral probe measures the six components (3B, 3E) of
the waves in the ULF range: 0.1–10 Hz and from time to time 0–30 Hz. Two
different kinds of waves have been observed in the auroral region at altitudes
between 10 000 and 20 000 km: (1) electrostatic emissions which consist of
quasi-monochromatic structures with frequencies above the oxygen gyrofrequency,
superimposed on a wide band signal interpreted as a Doppler broadening, (2)
electromagnetic wide band spectrum fluctuations. These emissions are interpreted
as current-driven electromagnetic or electrostatic ion cyclotron waves. The
electromagnetic/electrostatic character is controlled by the plasma parameter
βi and by the O+ concentration.
Key words. Magnetospheric physics · Auroral phenomena
· Plasma waves and instabilities · Interball Auroral probe |
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