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.

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