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The induced magnetosphere of comet Halley: Interplanetary magnetic field during Giotto encounter
Neubauer, F. M.; Israelevich, P. L.; Ershkovich, A. I.
Direction of the interplanetary magnetic field (IMF) which governs the orientation of the Halley's magnetosphere was restored by using Giotto magnetic field data. The Giotto trajectory was a twisted curve in the coordinate system rotating with IMF vector and covered rather uniformly the transverse cross section of the comet. Magnetic field vectors…
There is no ``cometopause'' at Comet Halley
Chaizy, P.; Reme, H.; Korth, A. +3 more
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 the ``cometopause,'' at a distance of ~1.6×105 km from the nucleus. Gringauz and Verigin (1991) presented the ``cometopause'' as …
Shock normal determination for multiple-ion shocks
Coates, A. J.; Neubauer, F. M.; Motschmann, U. +1 more
We have adapted the single-ion Viñas and Scudder (1986) solution to the Rankine-Hugoniot problem to a multiple-ion solution. Using this technique, we can calculate a shock normal direction, shock speed, best estimate of the upstream and downstream magnetic field and plasma asymptotic states, and θBn, the angle between the shock normal a…
The structure of mass-loading shocks. 1. Comets
Neubauer, F. M.; Zank, G. P.; Story, T. R.
A new multifluid model to describe the solar wind-cometary ion plasma in the outer cometary coma is derived. This model is distinguished from previous multifluid models in that wave-particle effects are included explicitly. By considering hydrodynamic timescales, self-consistent dissipative terms (which correspond to the spatial diffusion of comet…
Giotto ion mass spectrometer measurements at comet P/Grigg-Skjellerup
Altwegg, K.; Balsiger, H.; Neubauer, F. M. +6 more
The Giotto ion mass spectrometer high-intensity spectrometer (IMS-HIS) measured fluxes of ions from about 260,000 km before (1008:36 UT spacecraft time) to about 86,000 km after (1701:33 UT spacecraft time) closest approach to comet P/Grigg-Skjellerup during the encounter on July 10, 1992. Although the HIS sensor was not designed to measure proton…