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Compressive character of low frequency waves driven by newborn ions at comet Grigg-Skjellerup

Coates, A. J.; Belmont, G.; Neubauer, F. M. +2 more

The investigation by Giotto of the environment of comet P/Grigg-Skjellerup has provided a large set of observations on cometary low-frequency waves for a weakly active comet, after the observations at comets P/Giacobini-Zinner and P/Halley. A large amount of waves are observed at frequencies close to the local water group ion cyclotron frequencies…

Comet halley's nucleus: A physical interpretation

Keller, H. U.; Thomas, N.

The nucleus of comet Halley was the first to be detected and observed by cameras on board spacecraft during the fly-bys in 1986. The interpretation of both these observations and of the results from other experiments as well as many subsequent corroborative measurements of comet Halley and of other comets are reviewed. Cometary nuclei are relative…

Diamagnetic effect of the ion pile-up region of comet halley

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

The ion pile-up region in the comet Halley ionosphere observed on the inbound leg of the Giotto trajectory is accompanied by a decrease of the magnetic field strength. This magnetic field dip is explained by means of a diamagnetic effect of the plasma density increase in the pile-up region. No similar magnetic effect of the enhanced plasma density…