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| Titel |
Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko |
| VerfasserIn |
I. Richter, C. Koenders, H.-U. Auster, D. Frühauff, C. Götz, P. Heinisch, C. Perschke, U. Motschmann, B. Stoll, K. Altwegg  , J. Burch, C. Carr, E. Cupido, A. Eriksson, P. Henri, R. Goldstein, J.-P. Lebreton, P. Mokashi, Z. Nemeth, H. Nilsson, M. Rubin, K. Szego, B. T. Tsurutani, C. Vallat, M. Volwerk, K.-H. Glassmeier |
| 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 ; 33, no. 8 ; Nr. 33, no. 8 (2015-08-19), S.1031-1036 |
| Datensatznummer |
250121237
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| Publikation (Nr.) |
 copernicus.org/angeo-33-1031-2015.pdf |
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| Zusammenfassung |
| We report on magnetic field measurements made in the innermost coma of
67P/Churyumov-Gerasimenko in its low-activity state. Quasi-coherent,
large-amplitude (δ B/B ~ 1), compressional magnetic field
oscillations at ~ 40 mHz dominate the immediate plasma environment of
the nucleus. This differs from previously studied cometary interaction regions
where waves at the cometary ion gyro-frequencies are the main feature. Thus
classical pickup-ion-driven instabilities are unable to explain the
observations. We propose a cross-field current instability associated with
newborn cometary ion currents as a possible source mechanism. |
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