@article{Carr:2015:10.1002/2015GL064233,
author = {Carr, CM and Edberg, NJT and Eriksson, AI and Odelstad, E and Henri, P and Lebreton, J-P and Gasc, S and Rubin, M and Andre, M and Gill, R and Johansson, EPG and Johansson, F and Vigren, E and Wahlund, JE and Cupido, E and Glassmeier, K-H and Goldstein, R and Koenders, C and Mandt, K and Nemeth, Z and Nilsson, H and Richter, I and Stenberg, Wieser G and Szego, K and Volwerk, M},
doi = {10.1002/2015GL064233},
journal = {Geophysical Research Letters},
pages = {4263--4269},
title = {Spatial distribution of low-energy plasma around 2 comet 67P/CG from Rosetta measurements},
url = {http://dx.doi.org/10.1002/2015GL064233},
volume = {42},
year = {2015}
}

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TY  - JOUR
AB  - 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.
AU  - Carr,CM
AU  - Edberg,NJT
AU  - Eriksson,AI
AU  - Odelstad,E
AU  - Henri,P
AU  - Lebreton,J-P
AU  - Gasc,S
AU  - Rubin,M
AU  - Andre,M
AU  - Gill,R
AU  - Johansson,EPG
AU  - Johansson,F
AU  - Vigren,E
AU  - Wahlund,JE
AU  - Cupido,E
AU  - Glassmeier,K-H
AU  - Goldstein,R
AU  - Koenders,C
AU  - Mandt,K
AU  - Nemeth,Z
AU  - Nilsson,H
AU  - Richter,I
AU  - Stenberg,Wieser G
AU  - Szego,K
AU  - Volwerk,M
DO  - 10.1002/2015GL064233
EP  - 4269
PY  - 2015///
SN  - 1944-8007
SP  - 4263
TI  - Spatial distribution of low-energy plasma around 2 comet 67P/CG from Rosetta measurements
T2  - Geophysical Research Letters
UR  - http://dx.doi.org/10.1002/2015GL064233
UR  - http://hdl.handle.net/10044/1/23484
VL  - 42
ER  - 

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