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Cometary ion pickup processes: Halley and Grigg-Skjellerup compared

Johnstone, A. D.

After Giotto's encounters with two comets of quite different gas production rates we attempt to compare the results to see:- a) to what extent theories which fitted the results at Halley could be applied to the much smaller Grigg-Skjellerup; b) whether the different relationship between the various scale lengths involved created any observable eff…

Comparison of the main magnetic and plasma features in the environments of comets Grigg-Skjellerup and Halley

Glassmeier, K. -H.; Neubauer, F. M.; Reme, H. +1 more

The successful flyby of Giotto at the weakly active comet P/Grigg-Skjellerup on July 10, 1992 has added a new set of observations to those obtained at the active comet P/Halley in March 1986 for the study of the solar wind - comet interaction. Despite the very different scales of the interaction regions for the two comets (10^6 km for Halley and 1…

Interplanetary magnetic field during the Giotto encounter and the induced magnetosphere of comet Halley

Neubauer, F. M.; Israelevich, P. L.; Ershkovich, A. I.

The direction of the interplanetary magnetic field (IMF) which governs the orientation of the Halley's magnetosphere was restored. Giotto magnetic and plasma data were represented in the coordinate system rotating with the IMF.