Physics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815231c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A9, p. 15,231-15,240.
Physics
11
Cosmic Rays, Interplanetary Medium, Solar Activity, Solar Corona, Stellar Mass Ejection, Solar Magnetic Field, Solar Planetary Interactions, Solar Wind
Scientific paper
Superevents are long-lived (about 40 days at 1 AU) 10-MeV proton events that originate in episodes of intense solar activity characterized by major coronal mass ejections and individual solar energetic particle (SEP) events. Superevents exhibit only weak intensity variation with heliolongitude. They propagate to the outer heliosphere at speeds above that of the average solar wind, and, at Pioneers 10 and 11, prominent superevents are generally associated with strong interplanetary shocks. Of six intense superevents during the 1974-1985 interval, one occurred coincident with the onset of a step (June-July 1982), two occurred midway through step decreases, and three occurred at the ends of step decreases. Two step decreases during this period began in conjunction with relatively weak SEP activity. Thus the largest superevents occurring from 1974 to 1985 were neither necessary nor sufficient conditions for long-term GCR intensity steps and therefore were not closely related to the global merged interaction regions that have been identified with such steps.
Cliver Edward W.
Droege Wolfgang
Mueller-Mellin Reinhold
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