Major solar-energetic particle fluxes: II. Comparison of the interplanetary parameters between the three largest high-energy peak flux events 19-20/10/1989, 14/7/2000 and 9/11/2000

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The study of the largest solar-energetic particle (SEP) events gives important information about the physical process in the solar corona and in the heliosphere. The hourly SEPs and interplanetary (IP) and geomagnetic measurements of the three largest SEP events have been compared. The most relevant physical factors which determine the largest SEP properties have been examined. The results indicate that there is a quite different in IP and geomagnetic disturbances and in turn, the mechanism of particle accelerations among the three events. We found that the time profile of 14 July 2000 fluxes was not similar to that observed in 19-20 October 1989. The acceleration of fluxes was not a function of the IP shock's efficiency. The velocity of IP shock has been decelerated in its path in the inner heliosphere. The acceleration of the particles seems probably to happened in the lower part of the solar corona. The rate of geomagnetic disturbances during the 14-19 July 2000 was stronger than the other events and included highly changes. In contrast, the third event of 9 November 2000 was not shed a ground level enhancement. Fast rise and long decay in particle intensities which may be originated from different sources on the Sun. The IP shock was hardly deteriorated in its path to the Earth. Mere reduction in the interplanetary magnetic field connection has been obtained. The geomagnetic disturbances during the considered events have been examined and discussed.

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