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AGU: Geophysical Research Letters

 

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  • Planetology: Comets and Small Bodies: Interactions with solar wind plasma and fields

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 13, NO. 8, PP. 845-848, 1986
doi:10.1029/GL013i008p00845

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

A. A. Galeev

Space Research Institute, Moscow

K. I. Gringauz

Space Research Institute, Moscow

S. I. Klimov

Space Research Institute, Moscow

A. P. Remizov

Space Research Institute, Moscow

R. Z. Sagdeev

Space Research Institute, Moscow

S. P. Savin

Space Research Institute, Moscow

A. Yu. Sokolov

Space Research Institute, Moscow

M. I. Verigin

Space Research Institute, Moscow

K. Szego

Central Research Institute of Physics, Budapest

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.

Received 23 June 1986; accepted 10 July 1986; .

Citation: Galeev, A. A., K. I. Gringauz, S. I. Klimov, A. P. Remizov, R. Z. Sagdeev, S. P. Savin, A. Yu. Sokolov, M. I. Verigin, and K. Szego (1986), Critical ionization velocity effects in the inner coma of comet Halley: Measurements by Vega‐2, Geophys. Res. Lett., 13(8), 845–848, doi:10.1029/GL013i008p00845.

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