Speed Evolution of Fast CME/Shocks with SOHO/LASCO, Wind/WAVES, IPS and in-situ WIND data: Analysis of Kilometric Type-II Emissions (Invited)

Details Speed Evolution of Fast CME/Shocks with SOHO/LASCO, Wind/WAVES, IPS and in-situ WIND data: Analysis of Kilometric Type-II Emissions (Invited) Speed Evolution of Fast CME/Shocks with SOHO/LASCO, Wind/WAVES, IPS and in-situ WIND data: Analysis of Kilometric Type-II Emissions (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh43a..07g&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH43A-07

Astronomy and Astrophysics

Astrophysics

[2111] Interplanetary Physics / Ejecta, Driver Gases, And Magnetic Clouds, [2139] Interplanetary Physics / Interplanetary Shocks, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions

Scientific paper

Fast CME/shocks propagating in the interplanetary medium can generate kilometric Type II (km-TII) radio emissions at the local plasma frequency and/or its harmonic, so these radio emissions provide a means of remotely tracking CME/shocks. We apply a new analysis technique, using the frequency drift of km-TII spectrum obtained by the Thermal Noise Receiver (TNR) of the WIND/WAVES experiment, to infer, at some adequate intervals, the propagation speed of six CME/shocks. We combine these results with previously reported speeds from coronagraph white light and interplanetary scintillation observations, and in-situ measurements, to study the temporal speed evolution of the six events. The shock speed values obtained by the km-TII analysis are in a reasonable agreement with the speed measurements inferred by other techniques at different heliocentric distance ranges. The combination of all the speed measurements show a gradual deceleration of the CME/shocks as they propagate to 1 AU. This new technique can be useful in studying the evolution of fast CME/shocks when adequate intervals of km-TII emissions are available.

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