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An intense type III radio storm has been disrupted by a fast halo coronalmass ejection (CME) on 2000 April 4. The CME is also associated with a largesolar energetic particle (SEP) event. The storm recovers after about10 hrs. Weidentified another CME that occurs on 2003 November 11 with similar CMEproperties but there is no type III storm in progress. The 2003 November 11 CMEis also not associated with an SEP event above the background (less than 2pfu), whereas the one with type III storm has an intense SEP event (about 56pfu). One of the factors affecting the intensity of SEP events is the presenceof seed particles that are accelerated by CME-driven shocks. We suggest thatthe type III storm source, which accelerates electrons to produce the storm,also accelerates ions that serve as seed particles to the CME shock.

Can Type III Radio Storms be a Source of Seed Particles to Shock Acceleration?