On the problems of using ? Inv in study of non-trapped cosmic ray particles

Abstract

Due to the great utility showed by the invariant latitude as an ordering parameter for trapped radiation, it is generally consider that this parameter can always substitute the three coordinates of a point in order to have its magnetic clasification which allow us to infer the characteristics of the behavior of the charged particles observed at that point. The purpose of this work is to show that in many cases (mainly the study of particles of low and mean energies coming from the interplanetary medium into the magnetosphere) the knowledge of the invariant latitude of a point is not sufficient to deduce the propagation characteristics of the particles observed at a given point. The precise position of the point on the earth or its height over the surface determine differences between the directions of viewing and point of entry of the particles observed at there and those for particles observed at another point with the same invariant latitude but in different location.