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Detailed Reference Information
Gringauz et al. 1986
Gringauz, K.I., Gombosi, T.I., Tátrallyay, M., Verigin, M.I., Remizov, A.P., Richter, A.K., Apáthy, I., Szemerey, I., Dyachkov, A.V., Balakina, O.V. and Nagy, A.F. (1986). Detection of a new ‘‘chemical’’ boundary at comet Halley. Geophysical Research Letters 13: doi: 10.1029/GL013i007p00613. issn: 0094-8276.

Plasma observations near comet Halley indicate that around 1.6x105 km from the nucleus a newly discovered sharp boundary (cometopause) separates the solar wind controlled external and the heavy cometary ion dominated internal regions. Such a discontinuity was previously not predicted by theoretical models. Inside the cometopause (in the cometary plasma region) the protons and heavy ions move with different speeds: the heavy ion velocity is less than a few km/s throughout this region, while the protons decelerate from several tens of km/s (observed near the cometopause) to a few km/s (near 1.5x104 km).

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Geophysical Research Letters
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American Geophysical Union
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