Abstract: In this paper, it is shown that the appearance of dust cometary tails and of type Icome-tary tails are all stochastic processes. Some phenomena of type Itails, for example, their turbulences, their twisted events and the encountered process by Earth's magnetosphere are discussed. The relationship between the phenomena of comets and the electromagnetic environment of the solar-terrestrial space is analysed. It is pointed out hat there are similar statistical results for the distinct phenomena of type Itails, but mechanisms of the interactions are different.