Source Regions of the Type II Radio Burst Observed During a CME-CME Interaction on 2013 May 22

Abstract

We report on our study of radio source regions during the type II radio burst on 2013 May 22 based on direction finding (DF) analysis of the Wind/WAVES and STEREO/WAVES (SWAVES) radio observations at decameter-hectometric (DH) wavelengths. The type II emission showed an enhancement that coincided with interaction of two coronal mass ejections (CMEs) launched in sequence along closely spaced trajectories. The triangulation of the SWAVES source directions posited the ecliptic projections of the radio sources near the line connecting the Sun and the STEREO-A spacecraft. The WAVES and SWAVES source directions revealed shifts in the latitude of the radio source indicating that the spatial location of the dominant source of the type II emission varies during the CME-CME interaction. The WAVES source directions close to 1 MHz frequencies matched the location of the leading edge of the primary CME seen in the images of the LASCO/C3 coronagraph. This correspondence of spatial locations at both wavelengths confirms that the CME-CME interaction region is the source of the type II enhancement. Comparison of radio and white-light observations also showed that at lower frequencies scattering significantly affects radio wave propagation.

Accepted for publication in ApJ

References in corpus (4)

• Major Solar Eruptions and High Energy Particle Events during Solar Cycle 24
• Tracking the Evolution of A Coherent Magnetic Flux Rope Continuously from the Inner to the Outer Corona
• Determination of Electromagnetic Source Direction as an Eigenvalue Problem
• Interacting CMEs and their associated flare and SEP activities

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• Shock-accelerated electrons during the fast expansion of a coronal mass ejection
• Electron acceleration and radio emission following the early interaction of two coronal mass ejections
• Sequential Lid Removal in a Triple-Decker Chain of CME-Producing Solar Eruptions
• Interplanetary radio type II and type IV bursts as indicators of propagating solar transients
• Tracking the Source of Solar Type II Bursts through Comparisons of Simulations and Radio Data