Critical ionization velocity effects in the inner coma of comet Halley: Measurements by Vega‐2

A. A. Galeev, K. I. Gringauz, S. I. Klimov, A. P. Remizov, R. Z. Sagdeev, S. P. Savin, A. Yu Sokolov, M. I. Verigin, K. Szegö

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Abstract

Plasma density and plasma wave measurements aboard the "Vega‐2" spacecraft discovered two plasma density enhancements in the inner coma of comet Halley that are accompanied by bursts of plasma waves in the lower‐hybrid frequency range. These events are explained by the critical ionization velocity (CIV) effects of Alfvén. The persistent bursty plasma wave activity and the intermittent plasma density growth toward the cometary nucleus indicate that the CIV effect contributes to the ionization of the cometary gas.

Original languageEnglish
Pages (from-to)845-848
Number of pages4
JournalGeophysical Research Letters
Volume13
Issue number8
DOIs
Publication statusPublished - 1986

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Galeev, A. A., Gringauz, K. I., Klimov, S. I., Remizov, A. P., Sagdeev, R. Z., Savin, S. P., Sokolov, A. Y., Verigin, M. I., & Szegö, K. (1986). Critical ionization velocity effects in the inner coma of comet Halley: Measurements by Vega‐2. Geophysical Research Letters, 13(8), 845-848. https://doi.org/10.1029/GL013i008p00845