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Lower Hybrid Waves at Comet 67P/Churyumov-Gerasimenko
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2017 (Engelska)Ingår i: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 469, s. S29-S38Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Oxford University Press, 2017. Vol. 469, s. S29-S38
Nationell ämneskategori
Fusion, plasma och rymdfysik
Identifikatorer
URN: urn:nbn:se:kth:diva-218832DOI: 10.1093/mnras/stx868ISI: 000443940500003OAI: oai:DiVA.org:kth-218832DiVA, id: diva2:1161528
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QC 20171206

Tillgänglig från: 2017-11-30 Skapad: 2017-11-30 Senast uppdaterad: 2019-09-19Bibliografiskt granskad

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Av författaren/redaktören
Karlsson, Tomas
Av organisationen
Rymd- och plasmafysik
I samma tidskrift
Monthly notices of the Royal Astronomical Society
Fusion, plasma och rymdfysik

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