Charged particle signatures of the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko

Zoltan Nemeth, J. Burch, C. Goetz, R. Goldstein, P. Henri, C. Koenders, H. Madanian, K. Mandt, P. Mokashi, I. Richter, A. Timar, K. Szegö

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

One of the scientific objectives of the Rosetta mission is to investigate the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko. We employed combined data of several instruments of the Rosetta Plasma Consortium to identify and study diamagnetic cavity crossing events. Using electron data from the Ion Electron Sensor to complement the Magnetometer data enabled us to work out a search criterion for the cavity crossing events based on a unique signature we identified in the electron spectrum. Although this search criterion is insufficient to find all the cavity events, we were able to find an abundance of more than one hundred cavity crossings in the data obtained in the summer of 2015. This unexpectedly high number of events allowed us to study their common features, as well as the shape and extent of the diamagnetic cavity in the terminator plane. The results suggest that in the summer of 2015 there was a cavity around comet 67P, which had a highly variable outer boundary. We present the effects of the diamagnetic cavity on the thermal and suprathermal electron and suprathermal ion content of the plasma, and also the probable mechanisms responsible for these charged particle signatures.

Original languageEnglish
Pages (from-to)S415-S421
JournalMonthly Notices of the Royal Astronomical Society
Volume462
DOIs
Publication statusPublished - 2016

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comets
comet
charged particles
cavity
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cavities
electron
summer
electrons
Rosetta mission
plasma
particle
ion
magnetometer
complement
magnetometers
ions
sensor
sensors

Keywords

  • Comets: individual: 67P/Chuyumov-Gerasimenko
  • Magnetic fields
  • Methods: data analysis
  • Plasmas

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Charged particle signatures of the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko. / Nemeth, Zoltan; Burch, J.; Goetz, C.; Goldstein, R.; Henri, P.; Koenders, C.; Madanian, H.; Mandt, K.; Mokashi, P.; Richter, I.; Timar, A.; Szegö, K.

In: Monthly Notices of the Royal Astronomical Society, Vol. 462, 2016, p. S415-S421.

Research output: Contribution to journalArticle

Nemeth, Z, Burch, J, Goetz, C, Goldstein, R, Henri, P, Koenders, C, Madanian, H, Mandt, K, Mokashi, P, Richter, I, Timar, A & Szegö, K 2016, 'Charged particle signatures of the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko', Monthly Notices of the Royal Astronomical Society, vol. 462, pp. S415-S421. https://doi.org/10.1093/mnras/stw3028
Nemeth, Zoltan ; Burch, J. ; Goetz, C. ; Goldstein, R. ; Henri, P. ; Koenders, C. ; Madanian, H. ; Mandt, K. ; Mokashi, P. ; Richter, I. ; Timar, A. ; Szegö, K. / Charged particle signatures of the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 462. pp. S415-S421.
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AU - Koenders, C.

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