Plasma density structures at comet 67P/Churyumov–Gerasimenko

Engelhardt, I A D; Eriksson, A I; Stenberg Wieser, G; Goetz, C; Rubin, Martin; Henri, P; Nilsson, H; Odelstad, E; Hajra, R; Vallières, X (2018). Plasma density structures at comet 67P/Churyumov–Gerasimenko. Monthly notices of the Royal Astronomical Society, 477(1), pp. 1296-1307. Oxford Univ. Press 10.1093/mnras/sty765

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We present a Rosetta Plasma Consortium (RPC) case study based on four events in 2015 autumn at various radial distances, phase angles and local times, just after the perihelion of comet 67P/Churyumov–Gerasimenko. Pulse-like (high-amplitude, up to minutes in time) signatures are seen with several RPC instruments in the plasma density (with the LAngmuir Probe, LAP and Mutual Impedance Probe, MIP), ion energy and flux (with the Ion Composition Analyzer, ICA) and the magnetic field intensity (with the magnetometer, MAG). Furthermore, the cometocentric distance relative to the electron exobase is seen to be a good organizing parameter for the measured plasma variations. The closer Rosetta is to this boundary, the more pulses are measured. This is consistent with the pulses being filaments of plasma originating from the diamagnetic cavity boundary, as predicted by simulations.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

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 15:03

Last Modified:

23 Jul 2018 15:03

Publisher DOI:

10.1093/mnras/sty765

BORIS DOI:

10.7892/boris.118893

URI:

https://boris.unibe.ch/id/eprint/118893

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