Comparison of Type II Radio Emissions with CME Dynamics Measured by the LASCO White-light Coronagraph

Details Comparison of Type II Radio Emissions with CME Dynamics Measured by the LASCO White-light Coronagraph Comparison of Type II Radio Emissions with CME Dynamics Measured by the LASCO White-light Coronagraph

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh61a03r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH61A-03

Other

6964 Radio Wave Propagation, 6969 Remote Sensing, 7513 Coronal Mass Ejections, 7534 Radio Emissions

Scientific paper

We compare the observed frequency drift rate of metric and decametric type II radio emissions with the CME dynamics measured by the LASCO coronagraph. The radio data relate to the "true" CME/shock height and "true" CME projected liftoff time, but require knowledge of the coronal density profile since the observed radio frequency is related to the plasma density in the source region. The coronagraph data, on the other hand, measure the CME projected height and liftoff time. We attempt to determine the "true" dynamics of a CME by requiring consistency between the radio and white-light data. The technique will be illustrated for a CME observed on January 20, 2001 for which there were both well-defined frequency-drifting metric and decametric type II radio emissions. On this day there were two CMEs ejected from the sun about 2 hours apart, with the second CME overtaking and interacting with the first. We will also demonstrate how, in this case, the required consistency between the radio and white-light data can indicate changes in the coronal density profile encountered by the CME-driven shocks for these two CME events.

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