Plasma waves confined to the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko

被引：17

作者：

Gunell, H. ^{[1
,2
]}

Goetz, C. ^{[3
]}

Eriksson, A. ^{[4
]}

Nilsson, H. ^{[5
]}

Wedlund, C. Simon ^{[6
]}

Henri, P. ^{[7
]}

Maggiolo, R. ^{[1
]}

Hamrin, M. ^{[2
]}

De Keyser, J. ^{[1
]}

Rubin, M. ^{[8
]}

Wieser, G. Stenberg ^{[5
]}

Cessateur, G. ^{[1
]}

Dhooghe, F. ^{[1
]}

Gibbons, A. ^{[1
,9
]}

机构：

[1] Royal Belgian Inst Space Aeron BIRA IASB, Ave Circulaire 3, B-1180 Brussels, Belgium

[2] Umea Univ, Dept Phys, SE-90187 Umea, Sweden

[3] TU Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany

[4] Swedish Inst Space Phys, Angstrom Lab, Lagerhyddsvagen 1, SE-75121 Uppsala, Sweden

[5] Swedish Inst Space Phys, Box 812, SE-98128 Kiruna, Sweden

[6] Univ Oslo, Dept Phys, Box 1048 Blindern, N-0316 Oslo, Norway

[7] CNRS, LPC2E, F-45071 Orleans, France

[8] Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland

[9] Univ Libre Bruxelles, Lab Chim Quant & Photophys, 50 Ave FD Roosevelt, B-1050 Brussels, Belgium

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 469卷

关键词：

plasmas; waves; methods: analytic; methods: data analysis; comets: individual: 67P/Churyumov-Gerasimenko; AMPTE ARTIFICIAL COMET; LOW-FREQUENCY WAVES; SOLAR-WIND; ION WAVES; ROSETTA; CONSORTIUM; HALLEY; MAGNETOMETER; INSTABILITY; EVOLUTION;

D O I：

10.1093/mnras/stx1134

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Ion acoustic waves were observed in the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko by the Rosetta spacecraft on 2015 August 3, when the comet was 1.25 au from the Sun. Wave spectra recorded by the Langmuir probe (RPC-LAP), peak near 200 Hz, decrease for higher frequencies and reach the noise floor at approximately 1.5 kHz. These waves were observed only when the spacecraft was in the diamagnetic cavity or at its boundary, which is identified as a sharp drop in magnetic field magnitude, measured by RPC-MAG. The plasma, on both sides of the boundary, is dominated by a cold (a few hundred K) water group ion population, one cold (k(B)T(e) similar to 0.1 eV) and one warm (k(B)T(e) similar to 10 eV) electron population. The observations are interpreted in terms of current-driven ion acoustic waves, generated by currents that flow through bulges on the boundary of the diamagnetic cavity.

引用

页码：S84 / S92

页数：9

共 48 条

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