First results of plasma and neutral gas measurements from Vega- 1 2 near comet Halley

K. I. Gringauz, A. P. Remizov, M. I. Verigin, L. I. Denchikova, A. V. Dyachkov, I. N. Klimenko, G. A. Vladimirova, A. J. Somogyi, K. Szegö, S. Szendrö, M. Tátrallyay, A. Varga, E. Keppler, A. K. Richter

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Abstract

Based on the ion, electron and neutral gas observations, performed by five of the six sensors comprising the PLASMAG-1 experiment on board VEGA-1 and -2, the following results are discussed: (1) the existence of the bow shock and its location at {wreath product} 1.1×106 km for VEGA-1 inbound; (2) the existence of a cometopause and its location at {wreath product} 1.6×105 km for VEGA-2 inbound; (3) the plasma dynamical processes occurring inside the cometosheath; (4) the phenomena taking place within the cometary plasma region including mass-spectroscopy of cometary ions at distances {wreath product} 1.5×104 km; (5) the existence of keV electrons near closest approach to the nucleus; and (6) the radial dependence of the cometary neutral gas and the comparison with model calculations, yielding a mean ionization scale length of {wreath product} 2×106 km and an overall production rate of {wreath product} 1.3×1030 molecules s-1 for VEGA-1 inbound. The results are also discussed in the context of the other, both remote and in-situ, observations, performed on board the VEGA- and GIOTTO-spacecraft.

Original languageEnglish
Pages (from-to)165-174
Number of pages10
JournalAdvances in Space Research
Volume5
Issue number12
DOIs
Publication statusPublished - 1985

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

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    Gringauz, K. I., Remizov, A. P., Verigin, M. I., Denchikova, L. I., Dyachkov, A. V., Klimenko, I. N., Vladimirova, G. A., Somogyi, A. J., Szegö, K., Szendrö, S., Tátrallyay, M., Varga, A., Keppler, E., & Richter, A. K. (1985). First results of plasma and neutral gas measurements from Vega- 1 2 near comet Halley. Advances in Space Research, 5(12), 165-174. https://doi.org/10.1016/0273-1177(85)90082-1