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In large gradual solar energetic particle (SEP) events, especially theground-level enhancement (GLE) events, where and how energetic particles areaccelerated is still a problem. By using imaging data from TRACE, Yohkoh/HXT,SOHO/MDI and SOHO/EIT, along with the data from the GOES, Apatity NM, andSOHO/LASCO CME catalog, the evolution of the X5.7 two-ribbon flare and theassociated SEP event on 14 July 2000 are studied. It is found that the magneticreconnection in this event consists of two parts, and the induced electricfield Erec is temporally correlated with the evolution of hard X-ray andgamma-ray emission. In particular, the first hard X-ray and gamma-ray emissionpeak occurred at 10:22 UT, corresponding to the magnetic reconnection in thewestern part of the flare ribbons and the maximum Erec of 9.5 V/cm; the secondemission peak at 10:27 UT, corresponding to the eastern part and the maximumErec of 13.0 V/cm. We also analyze the SEP injection profiles as functions oftime and CME-height, and find two-component injection which may result fromdifferent acceleration mechanisms. A reasonable conclusion is that reconnectionelectric field makes a crucial contribution to the acceleration of relativisticparticles and to the impulsive component of the large gradual SEP event, whileCME-driven shocks play a dominant role in the gradual component.Comment: 6 pages, 7 figures, A&A, 461, 111

The acceleration characteristics of solar energetic particles in the 2000 July 14 event