Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 34, issue 9
Articles | Volume 34, issue 9
https://doi.org/10.5194/angeo-34-691-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-34-691-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 34, issue 9
Regular paper
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31 Aug 2016
Regular paper | Highlight paper |  | 31 Aug 2016

Modified ion-Weibel instability as a possible source of wave activity at Comet 67P/Churyumov-Gerasimenko

Patrick Meier, Karl-Heinz Glassmeier, and Uwe Motschmann

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Short summary
A new type of wave has been detected by the magnetometer of the Rosetta spacecraft close to comet P67/Churyumov-Gerasimenko. We provide the analytical model of this wave excitation from linear perturbation theory. A modified ion-Weibel instability is identified as source of this wave excited by a cometary current. The waves predominantly grow perpendicular to this current. A fan-like phase structure results from superposing the strongest growing waves in a cometary rest frame.
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