CME Dynamics in the Corona and Interplanetary Medium from Remote Radio Observations and In-situ Measurements

Details CME Dynamics in the Corona and Interplanetary Medium from Remote Radio Observations and In-situ Measurements CME Dynamics in the Corona and Interplanetary Medium from Remote Radio Observations and In-situ Measurements

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh51a..02r&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH51A-02

Other

6969 Remote Sensing, 7513 Coronal Mass Ejections, 7534 Radio Emissions

Scientific paper

Since CMEs play a major role in interplanetary dynamics and space weather, especially during Solar Maximum, it is crucial to analyze and understand the dynamics of CMEs throughout the inner heliosphere. White-light observations of CMEs from the LASCO coronagraph provide one means of studying CME dynamics out to 30 Rs. The CME plane-of-sky speeds derived from these coronagraph observations tend to be significantly higher than the CME speeds deduced from in-situ observations by interplanetary spacecraft, suggesting that the speed profile of a many CMEs may show significant deceleration. Some CMEs, especially the fast and energetic ones, drive strong shocks. These CME-driven shocks may generate radio emissions at decreasing frequencies as the CME-shock propagates through the decreasing interplanetary density. Thus remote radio sensing can also be used to investigate the evolution and propagation of CMEs throughout the inner heliosphere. These radio observations have the distinct advantage, in principle, of measuring the radial speed and acceleration of the CME, which can differ significantly from the plane-of-sky dynamics. We show how the shock speed measured in-situ at the spacecraft can be used, together with the constraints provided by the radio data from the WAVES experiment on the WIND spacecraft, to reconstruct the complete speed profile of the CME-shock from the solar corona to the spacecraft at 1 AU. Our analysis indicates that some CMEs decelerate rapidly in the high corona while others decelerate more slowly to distances well out into the interplanetary medium.

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