ON THE ORIGIN OF RADIO EMISSIONS ASSOCIATED WITH THE JANUARY 6-11, 1997, CME

Unusual type II radio emissions were generated by an Earth-directed CM E that originated at the sun on Jan. 6, 1997. The intensities of the o bserved radio emissions were significantly higher than for typical typ e II events, while the source sizes and the overall frequency drift ra te were significantly smaller. By introducing a new way of presenting the radio data that inherently reveals the dynamics of the type II rad io source, we used these type II radio emissions, observed by the WAVE S experiment on Wind, to track this CME through the interplanetary med ium (IPM). From an analysis of the observed frequencies, the frequency drift rates and the results of the Wind radio direction finding, we w ere able to identify specific interplanetary structures such as a CIR that were the probable sources of at least some of the type II radio e missions associated with this event. This is the first time that type II emissions have been traced to specific interplanetary structures.