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Once a cometary plasma cloud has been created through ionisation of thecometary neutrals, it presents an obstacle to the solar wind and the magneticfield within it. The acceleration and incorporation of the cometary plasma bythe solar wind is a complex process that shapes the cometary plasma environmentand is responsible for the creation of boundaries such as a bow shock anddiamagnetic cavity boundary. It also gives rise to waves and electric fieldswhich in turn contribute to the acceleration of the plasma. This chapter aimsto provide an overview of how the solar wind is modified by the presence of thecometary plasma, and how the cometary plasma is incorporated into the solarwind. We will also discuss models and techniques widely used in theinvestigation of the plasma environment in the context of recent findings byRosetta. In particular, this chapter highlights the richness of the processesand regions within this environment and how processes on small scales can shapeboundaries on large scales. It has been fifteen years since the last book onComets was published and since then we have made great advances in the field ofcometary research. But many open questions remain which are listed anddiscussed with particular emphasis on how to advance the field of cometaryplasma science through future space missions.

Solar wind interaction with a comet: evolution, variability, and implication