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| Titel |
Speed evolution of fast CME/shocks with SOHO/LASCO, WIND/WAVES, IPS and in-situ WIND data: analysis of kilometric type-II emissions |
| VerfasserIn |
A. Gonzalez-Esparza, E. Aguilar-Rodriguez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 10 ; Nr. 27, no. 10 (2009-10-21), S.3957-3966 |
| Datensatznummer |
250016684
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3957-2009.pdf |
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| Zusammenfassung |
| 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 speed values obtained by the km-TII analysis are in a
reasonable agreement with the speed measurements obtained 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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