Lower hybrid waves at comet 67P/Churyumov–Gerasimenko

André, M.; Odelstad, E.; Graham, D. B.; Eriksson, A. I.; Karlsson, T.; Stenberg Wieser, G.; Vigren, E.; Norgren, C.; Johansson, F. L.; Henri, P.; Rubin, Martin; Richter, I. (2017). Lower hybrid waves at comet 67P/Churyumov–Gerasimenko. Monthly notices of the Royal Astronomical Society, 469(Suppl_2), S29-S38. Oxford University Press 10.1093/mnras/stx868

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We investigate the generation of waves in the lower hybrid frequency range by density gradients in the near plasma environment of comet 67P/Churyumov–Gerasimenko. When the plasma is dominated by water ions from the comet, a situation with magnetized electrons and unmagnetized ions is favourable for the generation of lower hybrid waves. These waves can transfer energy between ions and electrons and reshape the plasma environment of the comet. We consider cometocentric distances out to a few hundred km. We find that when the electron motion is not significantly interrupted by collisions with neutrals, large average gradients within tens of km of the comet, as well as often observed local large density gradients at larger distances, are often likely to be favourable for the generation of lower hybrid waves. Overall, we find that waves in the lower hybrid frequency range are likely to be common in the near plasma environment.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Rubin, Martin

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

0035-8711

Publisher:

Oxford University Press

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

14 Nov 2017 10:46

Last Modified:

14 Nov 2017 10:46

Publisher DOI:

10.1093/mnras/stx868

BORIS DOI:

10.7892/boris.105812

URI:

https://boris.unibe.ch/id/eprint/105812

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