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| Titel |
Ion cyclotron waves during the Rosetta approach phase: a magnetic estimate of cometary outgassing |
| VerfasserIn |
M. Volwerk, C. Koenders, M. Delva, I. Richter, K. Schwingenschuh, M. S. Bentley, 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 ; 31, no. 12 ; Nr. 31, no. 12 (2013-12-17), S.2201-2206 |
| Datensatznummer |
250086162
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| Publikation (Nr.) |
 copernicus.org/angeo-31-2201-2013.pdf |
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| Zusammenfassung |
| A theoretical model for the ion cyclotron wave generation during the approach
phase of Rosetta to 67P/Churyumov–Gerasimenko is presented. For various
activity levels of the comet, the crossing of the observational threshold is
determined, whose level is derived from the wave power in the undisturbed
solar wind near the comet's location during the approach phase at the
appropriate frequency. The Giotto flyby at 27P/Grigg–Skjellerup is used to
obtain an estimate of how often water-group ion cyclotron waves are observed,
and to get insight into the wave forms. At 67P/Churyumov–Gerasimenko one can
expect to observe water-group ion cyclotron waves already at a distance of
600 000 km from the nucleus for a nominal outgassing rate of Q = 350 ×
1023 molecules per second. The observed first location of cyclotron waves
during the Rosetta approach phase will give an indication of the actual
outgassing rate of the comet. |
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