Abstract
High-energy proton (Ep > 55 MeV) and electron (Ee > 50 keV) events were observed by University of Iowa experiments on the satellites Explorer 33 and 35. The solar X-ray (2–12 A) flares associated with the energetic proton events were found to have in general higher peak fluxes, considerably longer decay times (Δt) and smaller rise to decay time ratios (r) than the X-ray flares associated with the electron events. The most common decay times and rise to decay time ratios are: 80⩽ Δt ⩽ 100 min, 0.1 ⩽ r ⩽ 0.2 for the proton X-ray flares and Δt ⩽ 20 min, 0.3 ⩽ r ⩽ 0.7 for the electron ones.
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