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We report on the properties of type II radio bursts observed by the Radio andPlasma Wave Experiment (WAVES) on board the Wind spacecraft over the past twosolar cycles. We confirm that the associated coronal mass ejections (CMEs) arefast and wide, more than half the CMEs being halos. About half of the type IIbursts extend down to 0.5 MHz, corresponding to a heliocentric distance of tensof solar radii. The DH type II bursts are mostly confined to the active regionbelt and their occurrence rate follows the solar activity cycle. Type II burstoccurring on the western hemisphere of the Sun and extending to lowerfrequencies are good indicators of a solar energetic particle event.

Properties of DH Type II Radio Bursts and Their Space Weather Implications