Abstract
Comet Halley and other cometary targets have been observed over a five-year period extending from 1985 August to 1990 May. 1-m and 24-inch telescopes have been used for near-nucleus studies and a selection of wide-angle Nikon camera lenses for large-scale structures. The imaging systems employed an Imaging Photon Detector in conjunction with narrow-band interference filters to isolate the emissions of various cometary species. Integration over these images give profiles extending over a large range in radius, facilitating accurate determinations of the CN and C 2 parent scalelengths, as well as the CN destruction scale. Dependence on solar activity is found and the results analysed separately for solar maximum and minimum conditions
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