Journal
ANNALES GEOPHYSICAE
Volume 33, Issue 8, Pages 1031-1036Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-33-1031-2015
Keywords
Magnetospheric physics (plasma waves and instabilities; solar wind interactions with unmagnetized bodies); solar physics astrophysics and astronomy (magnetic fields)
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Funding
- German Ministerium fur Wirtschaft und Energie
- Deutsches Zentrum fur Luft- und Raumfahrt [50QP 1401]
- federal state of Bern
- Swiss National Science Foundation
- ESA PRODEX program
- STFC [ST/K001051/1, ST/H002383/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K001051/1, ST/H002383/1] Funding Source: researchfish
- UK Space Agency [ST/K001698/1, ST/H004262/1] Funding Source: researchfish
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We report on magnetic field measurements made in the innermost coma of 67P/Churyumov-Gerasimenko in its low-activity state. Quasi-coherent, large-amplitude (delta B/B similar to 1), compressional magnetic field oscillations at similar to 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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