Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko
| Data(s) |
2015
|
|---|---|
| Resumo |
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. |
| Formato |
application/pdf application/pdf |
| Identificador |
http://boris.unibe.ch/74113/1/1505.06068v2.pdf http://boris.unibe.ch/74113/8/angeo-33-1031-2015.pdf Richter, I.; Koenders, C.; Auster, H.-U.; Frühauff, D.; Götz, C.; Heinisch, P.; Perschke, C.; Motschmann, U.; Stoll, B.; Altwegg, Kathrin; Burch, J.; Carr, C.; Cupido, E.; Eriksson, A.; Henri, P.; Goldstein, R.; Lebreton, J.-P.; Mokashi, P.; Nemeth, Z.; Nilsson, H.; ... (2015). Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko. Annales geophysicae, 33(8), pp. 1031-1036. European Geosciences Union (EGU) 10.5194/angeo-33-1031-2015 <http://dx.doi.org/10.5194/angeo-33-1031-2015> doi:10.7892/boris.74113 info:doi:10.5194/angeo-33-1031-2015 urn:issn:0992-7689 |
| Idioma(s) |
eng |
| Publicador |
European Geosciences Union (EGU) |
| Relação |
http://boris.unibe.ch/74113/ |
| Direitos |
info:eu-repo/semantics/openAccess info:eu-repo/semantics/openAccess |
| Fonte |
Richter, I.; Koenders, C.; Auster, H.-U.; Frühauff, D.; Götz, C.; Heinisch, P.; Perschke, C.; Motschmann, U.; Stoll, B.; Altwegg, Kathrin; Burch, J.; Carr, C.; Cupido, E.; Eriksson, A.; Henri, P.; Goldstein, R.; Lebreton, J.-P.; Mokashi, P.; Nemeth, Z.; Nilsson, H.; ... (2015). Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko. Annales geophysicae, 33(8), pp. 1031-1036. European Geosciences Union (EGU) 10.5194/angeo-33-1031-2015 <http://dx.doi.org/10.5194/angeo-33-1031-2015> |
| Palavras-Chave | #520 Astronomy #620 Engineering |
| Tipo |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed |
