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DOI: 10.1002/2015GL064233
论文题名:
Spatial distribution of low-energy plasma around comet 67P/CG from Rosetta measurements
作者: Edberg N.J.T.; Eriksson A.I.; Odelstad E.; Henri P.; Lebreton J.-P.; Gasc S.; Rubin M.; André M.; Gill R.; Johansson E.P.G.; Johansson F.; Vigren E.; Wahlund J.E.; Carr C.M.; Cupido E.; Glassmeier K.-H.; Goldstein R.; Koenders C.; Mandt K.; Nemeth Z.; Nilsson H.; Richter I.; Wieser G.S.; Szego K.; Volwerk M.
刊名: Geophysical Research Letters
ISSN: 0094-9451
EISSN: 1944-9182
出版年: 2015
卷: 42, 期:11
起始页码: 4263
结束页码: 4269
语种: 英语
英文关键词: comet ; ionosphere ; plasma ; Rosetta ; RPC
Scopus关键词: Collisionless plasmas ; Ionization of gases ; Ionosphere ; Nuclear reactions ; Plasmas ; Probes ; Comet ; Local ionization ; Low-energy plasma ; Mutual impedance probes ; Neutral densities ; Rosetta ; RPC ; Spatial structure ; Spatial distribution
英文摘要: We use measurements from the Rosetta plasma consortium Langmuir probe and mutual impedance probe to study the spatial distribution of low-energy plasma in the near-nucleus coma of comet 67P/Churyumov-Gerasimenko. The spatial distribution is highly structured with the highest density in the summer hemisphere and above the region connecting the two main lobes of the comet, i.e., the neck region. There is a clear correlation with the neutral density and the plasma to neutral density ratio is found to be ∼1-2·10-6, at a cometocentric distance of 10 km and at 3.1 AU from the Sun. A clear 6.2 h modulation of the plasma is seen as the neck is exposed twice per rotation. The electron density of the collisionless plasma within 260 km from the nucleus falls off with radial distance as ∼1/r. The spatial structure indicates that local ionization of neutral gas is the dominant source of low-energy plasma around the comet. ©2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84934444770&doi=10.1002%2f2015GL064233&partnerID=40&md5=e13695885be4ea7505e18a7a0191af7a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9066
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Swedish Institute of Space Physics, Uppsala, Sweden

Recommended Citation:
Edberg N.J.T.,Eriksson A.I.,Odelstad E.,et al. Spatial distribution of low-energy plasma around comet 67P/CG from Rosetta measurements[J]. Geophysical Research Letters,2015-01-01,42(11).
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