[Buttighoffer 1996 a]
Joint Ulysses and WIND observations of a particle event in April 1995
A. Buttighoffer, M. Pick, A. Raviart, S. Hoang,
R. P. Lin, G. M. Simnett, L. J. Lanzerotti
and V. Bothmer.
Joint Ulysses and WIND observations of a particle event in April 1995.
Astronomy and Astrophysics, 316, 499-505.
1996
Contents
In this paper we analyze a solar particle event that was measured at two
locations in the heliosphere.
Ulysses was at 40° north heliolatitude and 130° west in
heliolongitude from Earth while WIND was near Earth at 1 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 are shown to be of 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.
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