observation of a new type of low-frequency waves at comet 67p/churyumov-gerasimenko

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ID: 205617
2015
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Abstract
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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richter2015annalesobservation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors I. Richter, C. Koenders, H.-U. Auster, D. Frühauff, C. Götz, P. Heinisch, C. Perschke, U. Motschmann, B. Stoll, K. Altwegg, J. Burch, C. Carr, E. Cupido, A. Eriksson, P. Henri, R. Goldstein, J.-P. Lebreton, P. Mokashi, Z. Nemeth, H. Nilsson, M. Rubin, K. Szegö, B. T. Tsurutani, C. Vallat, M. Volwerk, K.-H. Glassmeier
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Journal journal of food measurement and characterization
Year 2015
DOI
10.5194/angeo-33-1031-2015
URL
https://www.ann-geophys.net/33/1031/2015/angeo-33-1031-2015.pdf
Keywords
cosmic physics sciencephysicsgeophysics

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