Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3231c&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
2
Scientific paper
In the current paradigm, solar energetic particle events are considered to belong to one of two classes. In one class (impulsive), particle acceleration is related to flare processes, most likely resulting from magnetic reconnection. The clearest signature of this flare process is the presence of type III (fast-drift) radio bursts caused by electron beams. In the other class of particle event (gradual), flares are considered to be of no importance and the particles are presumed to be accelerated at shocks driven by coronal mass ejections (CMEs). These particle events are the ones with the highest ion intensities. In a recent study it has been found that all major proton events are preceded by a fast-drift radio burst indicating that flare processes occur in gradual events as well. However the radio bursts usually start relatively high in the corona. It is also found that the largest of the particle events in the first class are associated with CMEs suggesting that the `two class' paradigm needs revising. It is proposed that the flare process occurs in all particle events and that the characteristics of the accelerated particles are determined by the height of the acceleration region in the corona. Low coronal heights will produce abundances and charge states typical of hot plasma whereas acceleration at high heights will result in abundances and charge states typical of the solar wind. Hence, one expects events with variations over a range of values. If the event includes a CME and an associated shock which has access to the flare particles for further acceleration, a long-lasting, high intensity particle event will result.
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