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Observation of a new type of low-frequency waves at comet 67P/Churyumov-Gerasimenko
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- Richter, I. (author)
- Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany.
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- Koenders, C. (author)
- Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany.
- Auster, H. -U (author)
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- Lebreton, J. -P (author)
- Glassmeier, K. -H (author)
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- Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany.;Tech Univ Carolo Wilhelmina Braunschweig, Inst Theoret Phys, D-38106 Braunschweig, Germany. (creator_code:org_t)
- 2015-08-19
- 2015
- English.
- In: Annales Geophysicae. - : Copernicus GmbH. - 0992-7689 .- 1432-0576. ; 33:8, s. 1031-1036
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Magnetospheric physics (plasma waves and instabilities
- solar wind interactions with unmagnetized bodies)
- solar physics astrophysics and astronomy (magnetic fields)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Richter, I.
- Koenders, C.
- Auster, H. -U
- Fruehauff, D.
- Goetz, C.
- Heinisch, P.
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- Perschke, C.
- Motschmann, U.
- Stoll, B.
- Altwegg, K.
- Burch, J.
- Carr, C.
- Cupido, E.
- Eriksson, Anders
- Henri, P.
- Goldstein, R.
- Lebreton, J. -P
- Mokashi, P.
- Nemeth, Z.
- Nilsson, H.
- Rubin, M.
- Szegoe, K.
- Tsurutani, B. T.
- Vallat, C.
- Volwerk, M.
- Glassmeier, K. - ...
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