An Eruptive Hot-Channel Structure Observed at Metric Wavelength as a Moving Type-IV Solar Radio Burst

Abstract

Hot channel (HC) structure, observed in the high-temperature passbands of the AIA/SDO, is regarded as one candidate of coronal flux rope which is an essential element of solar eruptions. Here we present the first radio imaging study of an HC structure in the metric wavelength. The associated radio emission manifests as a moving type-IV (t-IVm) burst. We show that the radio sources co-move outwards with the HC, indicating that the t-IV emitting energetic electrons are efficiently trapped within the structure. The t-IV sources at different frequencies present no considerable spatial dispersion during the early stage of the event, while the sources spread gradually along the eruptive HC structure at later stage with significant spatial dispersion. The t-IV bursts are characterized by a relatively-high brightness temperature ($\sim$ 10${}^7$ $-$ 10${}^9$ K), a moderate polarization, and a spectral shape that evolves considerably with time. This study demonstrates the possibility of imaging the eruptive HC structure at the metric wavelength and provides strong constraints on the t-IV emision mechanism, which, if understood, can be used to diagnose the essential parameters of the eruptive structure.

16 pages, 5 figures, Accepted for Publication in APJ Letters

References in corpus (4)

• Observation of An Evolving Magnetic Flux Rope Prior To and During A Solar Eruption
• A solar type II radio burst from CME-coronal ray interaction: simultaneous radio and EUV imaging
• Propagation of the 2012 March Coronal Mass Ejections from the Sun to Heliopause
• The improved ARTEMIS IV multichannel solar radio spectrograph of the University of Athens

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• Verification of the standard theory of plasma emission with particle-in-cell simulations
• Eruption of EUV Hot-Channel near Solar Limb and Associated Moving Type-IV Radio Burst
• Plasma emission induced by ring-distributed energetic electrons in overdense plasmas
• Interferometric imaging, and beam-formed study of a moving Type IV Radio burst with LOFAR