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Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko

by Nilsson, H. , Richter, I. , Vallat, C. , Burch, J. , Motschmann, U. , Auster, H.-U. , Szegö, K. , Perschke, C. , Cupido, E. , Henri, P. , Heinisch, P. , Mokashi, P. , Volwerk, M. , Frühauff, D. , Tsurutani, B. T. , Goldstein, R. , Lebreton, J.-P. , Stoll, B. , Carr, C. , Glassmeier, K.-H. , Götz, C. , Koenders, C. , Eriksson, A. , Altwegg, K. , Nemeth, Z. , Rubin, M.

in Astrophysics / Comet nuclei / Comets / Confidence intervals / Ion currents / Magnetic field / Magnetic fields / Magnetospheric physics (plasma waves and instabilities / Oscillations / Plasma / Sciences of the Universe / Sensors / solar physics astrophysics and astronomy (magnetic fields) / solar wind interactions with unmagnetized bodies / Variance analysis

2015

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Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko

2015

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Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko

2015

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Journal Article

Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko

Nilsson, H.,

Richter, I.,

Vallat, C.,

Burch, J.,

Motschmann, U.,

Auster, H.-U.,

Szegö, K.,

Perschke, C.,

Cupido, E.,

Henri, P.,

Heinisch, P.,

Mokashi, P.,

Volwerk, M.,

Frühauff, D.,

Tsurutani, B. T.,

Goldstein, R.,

Lebreton, J.-P.,

Stoll, B.,

Carr, C.,

Glassmeier, K.-H.,

Götz, C.,

Koenders, C.,

Eriksson, A.,

Altwegg, K.,

Nemeth, Z.,

Rubin, M.

2015

Overview

We report on magnetic field measurements made in the innermost coma of 67P/Churyumov-Gerasimenko in its low-activity state. Quasi-coherent, large-amplitude (δ B/B ~ 1), compressional magnetic field oscillations at ~ 40 mHz dominate the immediate plasma environment of the nucleus. This differs from previously studied cometary interaction regions where waves at the cometary ion gyro-frequencies are the main feature. Thus classical pickup-ion-driven instabilities are unable to explain the observations. We propose a cross-field current instability associated with newborn cometary ion currents as a possible source mechanism.

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Publisher

Copernicus GmbH,European Geosciences Union,Copernicus Publications

Subject

Astrophysics

/ Comet nuclei

/ Comets

/ Confidence intervals

/ Ion currents

/ Magnetic field

/ Magnetic fields