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Published online by Cambridge University Press: 30 March 2016
I select three topics of current interest (and some current confusion) to complement the previous paper of Asoka Mendis. The topics are relevant particularly to the studies developing models and predictions of the comet Halley environment for the forthcoming missions to that comet. The idea that electromagnetic forces are important for the dynamics of submicron dust grains and so should produce fans and structures in the coma indicates that correlations with solar wind conditions should be sought.