Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2922b&link_type=abstract
American Astronomical Society Meeting 210, #29.22; Bulletin of the American Astronomical Society, Vol. 39, p.141
Astronomy and Astrophysics
Astronomy
Scientific paper
An interplanetary (IP) type-II-like radio burst observed by WIND/WAVES is analyzed. It occurred on 2003 June 17 in association with a fast halo coronal mass ejection (CME), an M6.8 soft-X-ray (SXR) flare, and a solar proton event. Unlike coronal type II radio bursts and majority of IP type II radio emissions, the IP type-II-like event associated with the fast halo CME varies smoothly in time and frequency and has a frequency bandwidth that is several times larger than is typical for coronal and IP type II emissions. Moreover, the frequency change with time is inconsistent with that expected from plasma radiation associated with a CME-driven shock. I suggest that this IP type-II-like event, referred to here as an IP type II-S event, is not due to plasma radiation but, rather, incoherent synchrotron radiation from relativistic electrons entrained in the CME magnetic field, or in the sheath region between the shock and the CME driver. This event may be an example of a new and distinct class of interplanetary radio phenomenon.
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