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;C. Perschke;U. Motschmann;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
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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