T. S. Bastian 2007 ApJ 665 805 doi:10.1086/519246
T. S. Bastian1
Show affiliationsAn interplanetary (IP) type II-like radio burst is analyzed. It occurred on 2003 June 17-18 in association with a fast halo coronal mass ejection (CME), an M6.8 soft-X-ray (SXR) flare, and it produced a solar proton event. Unlike coronal type II bursts and the majority of IP type II radio emissions, the IP type-II-like event associated with the fast halo CME on June 17-18 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 instead to incoherent synchrotron radiation from near-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.
Sun: coronal mass ejections; Sun: flares; Sun: radio radiation; Sun: X-rays, gamma rays
Issue 1 (2007 August 10)
Received 2007 March 28, accepted for publication 2007 April 23
T. S. Bastian 2007 ApJ 665 805
Jincan Chen 1998 J. Phys. A: Math. Gen. 31 3383
Andrey Novitsky et al 2009 New J. Phys. 11 113001
H Kjeldsen et al 2002 J. Phys. B: At. Mol. Opt. Phys. 35 L375
K Nakkeeran 2000 J. Phys. A: Math. Gen. 33 3947
H. S. Knight et al. 2006 ApJ 640 941
J. R. Kuhn et al 2007 ApJ 668 L63
Max Karlovini and Lars Samuelsson 2007 Class. Quantum Grav. 24 3171
F. Yusef-Zadeh et al 1999 ApJ 518 L33
T Geszti and F Pazmandi 1987 J. Phys. A: Math. Gen. 20 L1299