Joint Ulysses and WIND observations of a particle event in April 1995

In this paper we analyze a solar particle event that was measured at two locations in the heliosphere. Ulysses was at 40 degrees north heliolatitude and 130 degrees west in heliolongitude from Earth while WIND was near Earth at I AU in the ecliptic plane. To establish the origin of the particle events, solar coronal activity is investigated. Direct observational evidence of the association between long-duration electron acceleration and a solar radio noise storm is shown. We also establish that the interplanetary type III burst studied here is produced by successive electron injections from distinct coronal locations. Two particle increases are observed during the event. For the first one, the particles sue shown to be from coronal origin; for the second one, which is associated with a Forbush decrease, the particles are primarily shock accelerated. The differences in particle intensities observed at WIND and Ulysses are explained by the nature of the particle propagation to the spacecraft locations.