Physics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5573k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5573-5591.
Physics
23
Energetic Particles, Particle Motion, Solar Corona, Solar Cosmic Rays, Solar Magnetic Field, Transport Properties, Azimuth, Statistical Analysis
Scientific paper
The study examines properties of solar energetic particle (SEP) events observed by both Helios spacecraft in the time period March 1976 to March 1980, in particular, variations of the intensity time profiles with angular distance between the flare and the observer's magnetic footpoint. Emphasis is placed on the neutral lines of the large-scale coronal magnetic field. For individual events, it is shown that sector boundaries can have a strong influence on intensities and time scales of SEP events. Variations of onset and maximum times as well as maximum intensities with angular distance between the flare and the observer's magnetic footpoint for 39 SEP events are discussed. It is found that particles can be observed on both sides of sector boundaries during both impulsive and gradual events. The onset times of about 0.5-MeV electrons can be ordered by the occurrence of sector boundaries.
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