Disappearing solar filaments and interplanetary shock waves

It is noted that since few disappearing filaments are accompanied by type II bursts, it has generally been thought that they are not shock associated. In contrast to the case for flares, however, the degree of association between type II bursts and disappearing filaments has not been clearly established. A determination is made here of the proportions of disappearing filaments that are associated with type II bursts and sudden commencements. The results are seen as indicating that disappearing filaments are seldom if ever associated with shocks near the sun, whereas the interplanetary disturbances caused by the disappearing filaments are frequently preceded by shocks at distances of approximately 1 AU.