Electric field measurements at the plasma frequency around comet 67P by RPC-MIP on board Rosetta

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dc.contributor.author Myllys, M.
dc.contributor.author Henri, P.
dc.contributor.author Vallieres, X.
dc.contributor.author Gilet, N.
dc.contributor.author Nilsson, H.
dc.contributor.author Palmerio, E.
dc.contributor.author Turc, L.
dc.contributor.author Wellbrock, A.
dc.contributor.author Goldstein, R.
dc.contributor.author Witasse, O.
dc.date.accessioned 2021-08-31T05:21:02Z
dc.date.available 2021-08-31T05:21:02Z
dc.date.issued 2021-08-12
dc.identifier.citation Myllys , M , Henri , P , Vallieres , X , Gilet , N , Nilsson , H , Palmerio , E , Turc , L , Wellbrock , A , Goldstein , R & Witasse , O 2021 , ' Electric field measurements at the plasma frequency around comet 67P by RPC-MIP on board Rosetta ' , Astronomy & Astrophysics , vol. 652 , 73 . https://doi.org/10.1051/0004-6361/201936633
dc.identifier.other PURE: 168013275
dc.identifier.other PURE UUID: 83f62ff5-4d72-42ac-93d8-367bb3008178
dc.identifier.other WOS: 000684346100005
dc.identifier.other ORCID: /0000-0002-7576-3251/work/99272982
dc.identifier.uri http://hdl.handle.net/10138/333785
dc.description.abstract Context. The Mutual Impedance Probe (RPC-MIP) carried by the Rosetta spacecraft monitored both the plasma density and the electric field in the close environment of comet 67P/Churyumov-Gerasimenko (67P), as the instrument was operating alternatively in two main modes: active and passive. The active mode is used primarily to perform plasma density measurements, while the passive mode enables the instrument to work as a wave analyzer. Aims. We are reporting electric field emissions at the plasma frequency near comet 67P observed by RPC-MIP passive mode. The electric field emissions are related to Langmuir waves within the cometary ionized environment. In addition, this study gives feedback on the density measurement capability of RPC-MIP in the presence of cold electrons. Methods. We studied the occurrence rate of the electric field emissions as well as their dependence on solar wind structures like stream interaction regions (SIRs) and coronal mass ejections (CMEs). Results. We are showing that strong electric field emissions at the plasma frequency near 67P were present sporadically throughout the period when Rosetta was escorting the comet, without being continuous, as the occurrence rate is reported to be of about 1% of all the measured RPC-MIP passive spectra showing strong electric field emissions. The Langmuir wave activity monitored by RPC-MIP showed measurable enhancements during SIR or CME interactions and near perihelion. Conclusions. According to our results, Langmuir waves are a common feature at 67P during the passage of SIRs. Comparing the plasma frequency given by the RPC-MIP passive mode during Langmuir wave periods with the RPC-MIP active mode observations, we conclude that the measurement accuracy of RPC-MIP depends on the operational submode when the cold electron component dominates the electron density. en
dc.format.extent 16
dc.language.iso eng
dc.relation.ispartof Astronomy & Astrophysics
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 115 Astronomy, Space science
dc.subject comets
dc.subject general
dc.subject methods
dc.subject data analysis
dc.subject waves
dc.subject SOLAR-WIND
dc.subject WAVES
dc.subject ION
dc.subject TEMPERATURE
dc.subject ENVIRONMENT
dc.subject IONOSPHERE
dc.subject ANISOTROPY
dc.title Electric field measurements at the plasma frequency around comet 67P by RPC-MIP on board Rosetta en
dc.type Article
dc.contributor.organization Particle Physics and Astrophysics
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1051/0004-6361/201936633
dc.relation.issn 0004-6361
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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