Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2316m&link_type=abstract
American Astronomical Society, SPD meeting #42, #23.16; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on a study of the speeds of type II radio bursts in the metric (m) and dekameter-hectometric (DH) wavelength range constrained by the time-height measurements of the associated coronal mass ejections (CMEs). Dynamic spectra of type II bursts show occasionally a clear discontinuity in frequency and temporal overlap of metric and DH type II bursts. This has been interpreted to signify either (1) a different origin of the type II components, i.e., the DH-component is caused by a CME-driven shock and the m-component by a blast wave or unknown source, or (2) same source but a different location, i.e., the DH-component originates from the shock nose and the m-component from the shock flanks. Our preliminary results suggest that the single CME-driven shock scenario can match both m and DH-component of type II bursts reasonably well, assuming that true space speeds of the CMEs and shocks are utilized.
Gopalswamy Nat
Makela Pertti
Yashiro Seiji
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