1987•NASA Technical Reports Server (NASA)Requires access
Solar energetic proton events and coronal mass ejections near solar minimum
S. W. Kahler, E. W. Cliver, H. V. Cane, R. E. McGuire, D. V. Reames, N. R. Sheeley, R. A. Howard
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Abstract
The association of coronal mass ejections (CMEs) with solar energetic (9-23 MeV) proton (SEP) events are examined during the 1983-1985 approach to solar minimum. Twenty-two of 25 SEP events were associated with CMEs, a result comparable to that previously found for the period 1979-1982 around solar maximum. Peak SEP fluxes were correlated with CME speeds but not with CME angular sizes. In addition, many associated CMEs lay well out of the ecliptic plane. In a reverse study using all west hemisphere CMEs lay CMEs of speeds exceeding 800 km/s and covering the period 1979-1985, 29 of 31 events originating on the solar disk or limb were associated with observed SEPs. However, in contrast to the previous study, no cases of SEP events were found associated with magnetically well connected flares of short duration that lacked CMEs.