Hall effect in the coma of 67P/Churyumov–Gerasimenko

Huang, Z; Tóth, G; Gombosi, T I; Jia, X; Combi, M R; Hansen, K C; Fougere, N; Shou, Y; Tenishev, V; Altwegg, Kathrin; Rubin, Martin (2018). Hall effect in the coma of 67P/Churyumov–Gerasimenko. Monthly notices of the Royal Astronomical Society, 475(2), pp. 2835-2841. Oxford Univ. Press 10.1093/mnras/stx3350

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Magnetohydrodynamics simulations have been carried out in studying the solar wind and cometary plasma interactions for decades. Various plasma boundaries have been simulated and compared well with observations for comet 1P/Halley. The Rosetta mission, which studies comet 67P/Churyumov–Gerasimenko, challenges our understanding of the solar wind and comet interactions. The Rosetta Plasma Consortium observed regions of very weak magnetic field outside the predicted diamagnetic cavity. In this paper, we simulate the inner coma with the Hall magnetohydrodynamics equations and show that the Hall effect is important in the inner coma environment. The magnetic field topology becomes complex and magnetic reconnection occurs on the dayside when the Hall effect is taken into account. The magnetic reconnection on the dayside can generate weak magnetic field regions outside the global diamagnetic cavity, which may explain the Rosetta Plasma Consortium observations. We conclude that the substantial change in the inner coma environment is due to the fact that the ion inertial length (or gyro radius) is not much smaller than the size of the diamagnetic cavity.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Altwegg, Kathrin and Rubin, Martin

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science > 530 Physics

ISSN:

0035-8711

Publisher:

Oxford Univ. Press

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

23 Jul 2018 15:42

Last Modified:

23 Jul 2018 15:42

Publisher DOI:

10.1093/mnras/stx3350

BORIS DOI:

10.7892/boris.118894

URI:

https://boris.unibe.ch/id/eprint/118894

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