Hybrid modeling of cometary plasma environments

II. Remote-sensing of a cometary bow shock

Document identifier: oai:DiVA.org:ltu-76347
Access full text here:10.1051/0004-6361/201834863
Keyword: Engineering and Technology, Mechanical Engineering, Aerospace Engineering, Teknik och teknologier, Maskinteknik, Rymd- och flygteknik, Comets: general, Comets: individual: 67P/Churyumov-Gerasimenko, Methods: numerical / plasmas / shock waves, Techniques: miscellaneous, Atmospheric science, Atmosfärsvetenskap
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructureSDG 3 Good health and wellbeing
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

Context. The ESA Rosetta probe has not seen direct evidence of a fully formed bow shock at comet 67P/Churyumov–Gerasimenko (67P). Ion spectrometer measurements of cometary pickup ions measured in the vicinity of the nucleus of 67P are available and may contain signatures of the large-scale plasma environment.

Aims. The aim is to investigate the possibility of using pickup ion signatures to infer the existence or nonexistence of a bow shock-like structure and possibly other large-scale plasma environment features.

Methods. A numerical plasma model in the hybrid plasma description was used to model the plasma environment of a comet. Simulated pickup ion spectra were generated for different interplanetary magnetic field conditions. The results were interpreted through test particle tracing in the hybrid simulation solutions.

Results. Features of the observed pickup ion energy spectrum were reproduced, and the model was used to interpret the observation to be consistent with a shock-like structure. We identify (1) a spectral break related to the bow shock, (2) a mechanism for generating the spectral break, and (3) a dependency of the energy of the spectral break on the interplanetary magnetic field magnitude and bow shock standoff distance.

Authors

Markku Alho

Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, Aalto, Finland
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Cyril Simon Wedlund

Department of Physics, University of Oslo, Oslo, Norway
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Hans Nilsson

Luleå tekniska universitet; Rymdteknik; Swedish Institute of Space Physics, Kiruna, Sweden
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Esa Kallio

Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, Aalto, Finland
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R. Jarvinen

School of Electrical Engineering, Aalto University, Aalto, Finland. Finnish Meteorological Institute, Helsinki, Finland
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T.I Pulkkinen

School of Electrical Engineering, Aalto University, Aalto, Finland. Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI,USA
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