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Lower Hybrid Waves at Comet 67P/Churyumov-Gerasimenko
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2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 469Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Oxford University Press, 2017. Vol. 469
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-218832DOI: 10.1093/mnras/stx868OAI: oai:DiVA.org:kth-218832DiVA: diva2:1161528
Note

QC 20171206

Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2017-12-06Bibliographically approved

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