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Rosetta measurements of lower hybrid frequency range electric field oscillations in the plasma environment of comet 67P
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0003-1270-1616
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2017 (engelsk)Inngår i: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, nr 4, s. 1641-1651Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Electric field measurements from cometary environments are very rare but can provide important information on how plasma waves help fashion the plasma environment. The long dwelling time of the Rosetta spacecraft close to comet 67P/Churyumov-Gerasimenko promises to improve this state. We here present the first electric field measurements from 67P, performed by the Rosetta dual Langmuir probe instrument LAP. Measurements of the electric field from cometocentric distances of 149 and 348 km are presented together with estimates of plasma density changes. Persistent wave activity around the local H2O+ lower hybrid frequency is observed, with the largest amplitudes observed at sharp plasma gradients. We demonstrate that the necessary requirements for the lower hybrid drift instability to be operating are fulfilled. We suggest that lower hybrid waves are responsible for the creation of a warm electron population, the origins of which have been unknown so far, by heating ambient electrons in the magnetic field-parallel direction.

sted, utgiver, år, opplag, sider
American Geophysical Union (AGU), 2017. Vol. 44, nr 4, s. 1641-1651
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URN: urn:nbn:se:kth:diva-204075DOI: 10.1002/2016GL072419ISI: 000396411100004Scopus ID: 2-s2.0-85013420127OAI: oai:DiVA.org:kth-204075DiVA, id: diva2:1085502
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QC 20170329

Tilgjengelig fra: 2017-03-29 Laget: 2017-03-29 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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Karlsson, TomasKullen, AnitaLindqvist, Per Arne

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