Time Scales of Solar Energetic Particle Events and Speeds of Source CMEs

Physics

Scientific paper

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7513 Coronal Mass Ejections, 7514 Energetic Particles (2114)

Scientific paper

Solar Energetic Particle (SEP) events are characterized primarily by their peak intensities or fluences. Event temporal characteristics and their associations with solar phenomena are less frequently considered. We measure the times to SEP event onsets, rise times and event durations of E = 20 MeV solar proton events observed with the NASA/GSFC Epact instrument on the Wind spacecraft. The approximately 140 SEP events, observed from 1998 through 2002, were accompanied by associated coronal mass ejections (CMEs) observed with the Lasco coronagraph on the SOHO spacecraft. The timing characteristics of the SEP events are compared with the speeds and widths of the associated CMEs to determine whether any of the characteristics of the SEP intensity-time profiles can be related to CME properties. The longitude dependence of the temporal profiles is considered separately to determine the geometric extents of the shocks producing the SEP events at 1 AU.

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