Hybrid modeling of cometary plasma environments. II: Remote-sensing of a cometary bow shock

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

Organisaatiot

  • University of Michigan, Ann Arbor
  • University of Oslo
  • Swedish Institute of Space Physics
  • Luleå University of Technology
  • Finnish Meteorological Institute

Kuvaus

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 e
energy of the spectral break on the interplanetary magnetic field magnitude and bow shock standoff distance.

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivumäärä16
JulkaisuAstronomy & Astrophysics
TilaSähköinen julkaisu (e-pub) ennen painettua julkistusta - 27 helmikuuta 2019
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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