GSTDTAP  > 气候变化
DOI10.1029/2017GL076415
Extremely Low-Frequency Waves Inside the Diamagnetic Cavity of Comet 67P/Churyumov-Gerasimenko
Madsen, B.1,2; Wedlund, C. Simon1; Eriksson, A.3; Goetz, C.4; Karlsson, T.5; Gunell, H.6,7; Spicher, A.1; Henri, P.8; Vallieres, X.8; Miloch, W. J.1
2018-05-16
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2018
卷号45期号:9页码:3854-3864
文章类型Article
语种英语
国家Norway; Denmark; Sweden; Germany; Belgium; France
英文摘要

The European Space Agency/Rosetta mission to comet 67P/Churyumov-Gerasimenko has provided several hundred observations of the cometary diamagnetic cavity induced by the interaction between outgassed cometary particles, cometary ions, and the solar wind magnetic field. Here we present the first electric field measurements of four preperihelion and postperihelion cavity crossings on 28 May 2015 and 17 February 2016, using the dual-probe electric field mode of the Langmuir probe (LAP) instrument of the Rosetta Plasma Consortium. We find that on large scales, variations in the electric field fluctuations capture the cavity and boundary regions observed in the already well-studied magnetic field, suggesting the electric field mode of the LAP instrument as a reliable tool to image cavity crossings. In addition, the LAP electric field mode unravels for the first time extremely low-frequency waves within two cavities. These low-frequency electrostatic waves are likely triggered by lower-hybrid waves observed in the surrounding magnetized plasma.


Plain Language Summary As sunlight heats a comet nucleus, frozen volatile gases sublimate are ionized and interact with the solar wind and its embedded magnetic field, inducing a dynamical plasma environment around the comet. With the cornerstone European mission Rosetta and its 2years of near-continuous orbiting of comet 67P/Churyumov-Gerasimenko, the origin, structure, and evolution of this environment are only starting to be unveiled. Exciting are the numerous crossings of the diamagnetic cavity, the innermost plasma region from which the solar wind magnetic field is excluded. Whilst the magnetic field structure of the cavity crossings is well studied, the related electric field activity remains until now unexplored. Studying the electric field with the Langmuir probes onboard Rosetta, we find that whereas the large-scale electric field structure agrees well with the observed magnetic field behavior during cavity crossings, unexpected short-lived low-frequency electric field signals manifest themselves within the cavity. We interpret these as electrostatic waves triggered by a modulating of the cavity boundary caused by observed electrostatic waves at the same frequency in the surrounding magnetized plasma. This unravels a new aspect of the electromagnetic activity in the inner cometary environment, which is crucial for our understanding of the comet-solar wind-induced plasma environment.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000434111700012
WOS关键词PLASMA ; ROSETTA ; RPC ; EVOLUTION ; MAGNETOMETER ; ENVIRONMENT ; PROBE ; HOT
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/27845
专题气候变化
作者单位1.Univ Oslo, Dept Phys, Oslo, Norway;
2.Tech Univ Denmark, Lyngby, Denmark;
3.Swedish Inst Space Phys IRFU, Uppsala, Sweden;
4.Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Braunschweig, Germany;
5.KTH Royal Inst Technol, Sch Elect Engn, Dept Space & Plasma Phys, Stockholm, Sweden;
6.Royal Belgian Inst Space Aeron BIRA IASB, Brussels, Belgium;
7.Umea Univ, Dept Phys, Umea, Sweden;
8.Lab Phys & Chim Environm & Espace LPC2E, Orleans, France
推荐引用方式
GB/T 7714
Madsen, B.,Wedlund, C. Simon,Eriksson, A.,et al. Extremely Low-Frequency Waves Inside the Diamagnetic Cavity of Comet 67P/Churyumov-Gerasimenko[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(9):3854-3864.
APA Madsen, B..,Wedlund, C. Simon.,Eriksson, A..,Goetz, C..,Karlsson, T..,...&Miloch, W. J..(2018).Extremely Low-Frequency Waves Inside the Diamagnetic Cavity of Comet 67P/Churyumov-Gerasimenko.GEOPHYSICAL RESEARCH LETTERS,45(9),3854-3864.
MLA Madsen, B.,et al."Extremely Low-Frequency Waves Inside the Diamagnetic Cavity of Comet 67P/Churyumov-Gerasimenko".GEOPHYSICAL RESEARCH LETTERS 45.9(2018):3854-3864.
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