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Evidence of in-situ Type II radio bursts in interplanetary shocks

Published online by Cambridge University Press:  12 September 2017

S. M. Díaz-Castillo
Affiliation:
Observatorio Astronómico Nacional, Universidad Nacional de Colombia Bogotá, Colombia email: smdiazcas@unal.edu.co, bcalvom@unal.edu.co
J. C. Martínez Oliveros
Affiliation:
Space Sciences Laboratory, University of California, Berkeley, USA email: oliveros@ssl.berkeley.edu
B. Calvo-Mozo
Affiliation:
Observatorio Astronómico Nacional, Universidad Nacional de Colombia Bogotá, Colombia email: smdiazcas@unal.edu.co, bcalvom@unal.edu.co
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Abstract

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We present a database of 11 interplanetary shocks associated to coronal mass ejections (CMEs) observed by STEREO and Wind missions between 2006 and 2011 that show evidence of Type II radio burst. For all events, we calculated the principal characteristics of the shock driver, the intensity and geometrical configuration of the in-situ shock and checked for the existence of in-situ type II radio burst. We made a comparative analysis of two CME events (on 18 August 2010 and 4 June 2011), which are apparently associated to two or more magnetic structures which interact in space (i.e. CMEs, SIRs, CIRs). These events show varied shock configurations and intensities. We found evidence of in-situ type II radio bursts in one of the events studied, suggesting that the geometry of the shock (quasi-perpendicularity) is also critical for the generation and/or detection of radio emission in-situ.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

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