Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996adspr..17...75s&link_type=abstract
Advances in Space Research, Volume 17, Issue 3, p. 75-84.
Other
1
Scientific paper
There is increasing evidence that regions of the corona or the inner heliosphere sometimes impede the escape of energetic particles accelerated at the Sun. Certain impulsive radio, X- and gamma-ray emissions indicate times at which major particle acceleration has recently occurred. The more gradual emissions are harder to interpret, and may reflect losses either of a particle population trapped in the corona or from particles which are being continuously accelerated. Yet sometimes particles are observed in interplanetary space, and at other times they are not. In fact, spacecraft observations of energetic particles show a wide variety of phenomena, ranging from highly collimated beams which propagate over several AU essentially ``scatter-free'', to long-lived, slowly-varying events. The elemental composition and the relative abundance of mildly-relativistic electrons to ions of around a few Mev/nucleon may be useful parameters for identifying the exact history of particles in space. However, the unknown factor between the acceleration site and the point of observation is the degree of control exercised by the coronal magnetic field on the storage, transport in longitude and release into interplanetary space, of the particles. We review the data and present some new Ulysses observations of particle propagation to high heliospheric latitudes. Implications on the magnetic configuration of the corona out to several solar radii are discussed. The relevance of a Solar Probe for advancing this research is outlined.
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