A STUDY OF THE EVOLUTION OF ELECTRON AND ION-ACCELERATION DURING THE 09 09 UT SOLAR-FLARE ON 1989 SEPTEMBER 9/

By use of radio, optical, X-ray and gamma-ray observations we have stu died the evolution of electron and ion acceleration during the 09:09 U T solar flare on 1989 September 9. The event is characterized by chang es in the energetic photon spectrum as new radio sources appear. As th e flare develops in energetic photon emissions the hard X-ray emission increases sporadically and low level nuclear line emission appears. A t the time of initiation of the major increase in intensity of energet ic photons, the power law bremsstrahlung spectrum hardens significantl y and photons > 10 MeV are produced. During this increase the electron and proton interaction rates are enhanced, respectively, by factors o f 8 and (11-16). This may indicate that proton acceleration became sli ghtly more efficient than the acceleration of electrons. The increased efficiency in producing the energetic electrons and ions is clearly a ssociated with the appearance of a new radio source. It is of particul ar interest that a new eruptive Halpha feature appears outside the mai n flare ribbons in association with the major phase of the flare.