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First Observation of a Type II Solar Radio Burst Transitioning between a Stationary and Drifting State

Chrysaphi, N; Reid, HAS; Kontar, EP; (2020) First Observation of a Type II Solar Radio Burst Transitioning between a Stationary and Drifting State. The Astrophysical Journal , 893 (2) , Article 115. 10.3847/1538-4357/ab80c1. Green open access

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Abstract

Standing shocks are believed to be responsible for stationary Type II solar radio bursts, whereas drifting Type II bursts are excited by moving shocks often related to coronal mass ejections (CMEs). Observations of either stationary or drifting Type II bursts are common, but a transition between the two states has not yet been reported. Here, we present a Type II burst which shows a clear, continuous transition from a stationary to a drifting state, the first observation of its kind. Moreover, band splitting is observed in the stationary parts of the burst, as well as intriguing negative and positive frequency-drift fine structures within the stationary emissions. The relation of the radio emissions to an observed jet and a narrow CME were investigated across multiple wavelengths, and the mechanisms leading to the transitioning Type II burst were determined. We find that a jet eruption generates a streamer-puff CME and that the interplay between the CME-driven shock and the streamer is likely to be responsible for the observed radio emissions.

Type: Article
Title: First Observation of a Type II Solar Radio Burst Transitioning between a Stationary and Drifting State
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/ab80c1
Publisher version: https://doi.org/10.3847/1538-4357/ab80c1
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. http://creativecommons.org/licenses/by/4.0/
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10097707
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