Particle acceleration in the 6 November 1997 event as viewed from gamma rays and solar energetic particles

An intense solar event was observed on 6 November 1997 with Yohkoh and solar energetic particle (SEP) satellites. The Yohkoh gamma-ray spectrum and soft / hard X-ray images exhibit a characteristic of an impulsive event, while the SEP energy spectra, elemental abundances and charge states indicate features of a mixed-gradual event. These observations suggest that two different types of particle populations were produced during this event. We discuss possibilities of particle acceleration processes for these two populations. For the gamma-ray producing-particles and impulsive SEPs stochastic aceleration through cascading Alfven waves and Fermi stochastic acceleration at fast shocks have been proposed. These plasma waves are generated at a magnetic reconnection site above a top of the flaring loop. On the other hand, for the gradual SEPs a large amount of coronal particles and solar wind are accelerated by a coronal and CME-driven shocks in the higher corona and interplanetary space.