DETECTION OF A SOLAR PARTICLE EVENT AT AN HELIOLATITUDE OF 73.8-DEGREES-S

We report the observations of an electron event at a heliolatitude of 73.8 degrees S, the highest latitude interplanetary solar event report ed to date. This event was detectable because the interplanetary backg round was not obscured by electrons produced in co- rotating interacti on regions. The event was associated with an interplanetary type III b urst and a solar active region located at 6 degrees S as detected by t he Nancay radioheliograph. The origin of the electrons is discussed. T he observations favor an acceleration process in the low or middle cor ona followed by coronal propagation from the solar source to the highe st heliolatitudes. This high latitude electron event presents rather d ifferent characteristics from those detected at low heliolatitudes.