Possible models on disturbances of the plasma tail of comet Halley during the 1985-1986 apparition

More than 500 photographs of the plasma tail of comet P/Halley taken from the ground during this apparition are surveyed to study the solar wind-plasma tail interaction. The main disturbances of the plasma tail are tabulated, classifying them as outstanding streamers, rays, condensations helices, arcades, kinks, or disconnection events (DE). Based on the photographs, a standard three-dimensional model of the cometary magnetosphere is proposed. The classified plasma tail disturbances are explained further by possible interaction models taking into account of the IMF observation by Sakigake.