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The variation of protons, alpha particles, and the magnetic field across the bow shock of comet Halley

Schwenn, R.; Balsiger, H.; Neubauer, F. M. +7 more

Data from the Ion Mass Spectrometer and the magnetometer on the Giotto spacecraft are used to examine the structure of the inbound crossing of the comet Halley bow shock on March 13, 1986. It is found that the velocity decrease, the field strength increase, and the heating of picked up cometary protons occurred over a broad region corresponding to…

Image restoration using the point spread function of the Halley Multicolour Camera

Keller, H. U.; Kramm, J. R.; Moehring, W.

The optical resolution of the Halley Multicolour Camera (HMC) is limited by its finite aperture, by minute mechanical degradations within the instrument, and by the high speed time delay and integration (TDI) illumination method adapted to the spin of the spacecraft. The sum of all implies a visible loss of image sharpness. The smearing effect has…