Ionospheric plasma of comet 67P probed by Rosetta at 3 au from the Sun

Galand, M.; Héritier, K. L.; Odelstad, E.; Henri, P.; Broiles, T. W.; Allen, A. J.; Altwegg, Kathrin; Beth, A.; Burch, J. L.; Carr, C. M.; Cupido, E.; Eriksson, A. I.; Glassmeier, K.-H.; Johansson, F. L.; Lebreton, J.-P.; Mandt, K. E.; Nilsson, H.; Richter, I.; Rubin, Martin; Sagnières, L. B. M.; ... (2016). Ionospheric plasma of comet 67P probed by Rosetta at 3 au from the Sun. Monthly notices of the Royal Astronomical Society, 462(Suppl 1), S331-S351. Oxford University Press 10.1093/mnras/stw2891

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We propose to identify the main sources of ionization of the plasma in the coma of comet 67P/Churyumov–Gerasimenko at different locations in the coma and to quantify their relative importance, for the first time, for close cometocentric distances (<20 km) and large heliocentric distances (>3 au). The ionospheric model proposed is used as an organizing element of a multi-instrument data set from the Rosetta Plasma Consortium (RPC) plasma and particle sensors, from the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis and from the Microwave Instrument on the Rosetta Orbiter, all on board the ESA/Rosetta spacecraft. The calculated ionospheric density driven by Rosetta observations is compared to the RPC-Langmuir Probe and RPC-Mutual Impedance Probe electron density. The main cometary plasma sources identified are photoionization of solar extreme ultraviolet (EUV) radiation and energetic electron-impact ionization. Over the northern, summer hemisphere, the solar EUV radiation is found to drive the electron density – with occasional periods when energetic electrons are also significant. Over the southern, winter hemisphere, photoionization alone cannot explain the observed electron density, which reaches sometimes higher values than over the summer hemisphere; electron-impact ionization has to be taken into account. The bulk of the electron population is warm with temperature of the order of 7–10 eV. For increased neutral densities, we show evidence of partial energy degradation of the hot electron energy tail and cooling of the full electron population.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Altwegg, Kathrin; Rubin, Martin; Tzou, Chia-Yu and Wurz, Peter

Subjects:

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

ISSN:

0035-8711

Publisher:

Oxford University Press

Language:

English

Submitter:

Katharina Weyeneth-Moser

Date Deposited:

06 Jul 2017 10:54

Last Modified:

06 Jul 2017 10:54

Publisher DOI:

10.1093/mnras/stw2891

BORIS DOI:

10.7892/boris.97002

URI:

https://boris.unibe.ch/id/eprint/97002

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