Immediately after the flybys at comet Halley by a fleet of spacecraft
in 1986, Gringauz et al. (1986a) reported the detection by the Vega-2
spacecraft of a chemical and sharp plasma boundary, which they named t
he ''cometopause,'' at a distance of similar to 1.6x10(5) km from the
nucleus. Gringauz and Verigin (1991) presented the ''cometopause'' as
a permanent feature of the solar wind - Halley type comet interaction
at similar to 1 UA from the Sun. This permanent boundary presumably se
parates an upstream region dominated by the solar wind from the downst
ream region where heavy cometary ions dominate. We present here the an
alysis of the results of the Giotto positive ion cluster composition a
nalyzer - Reme plasma analyzer (PICCA-RPA2) ion mass spectrometer and
electron electrostatic analyzer - Reme plasma analyzer (EESA-RPA1) ele
ctron spectrometer data, which clearly show that there is no such boun
dary at comet Halley.