First observation of a type II solar radio burst transitioning between a stationary and drifting state

Chrysaphi, N. , Reid, H. A.S. and Kontar, E. P. (2020) First observation of a type II solar radio burst transitioning between a stationary and drifting state. Astrophysical Journal, 893(2), 115. (doi: 10.3847/1538-4357/ab80c1)

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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.

Item Type:Articles
Keywords:360, The Sun and the Heliosphere, Solar physics, Solar activity, Solar radiation, Solar coronal mass ejection shocks, Shocks, Radio bursts, Solar coronal radio emission.
Glasgow Author(s) Enlighten ID:Kontar, Professor Eduard and Reid, Dr Hamish and Chrysaphi, Dr Nicolina
Authors: Chrysaphi, N., Reid, H. A.S., and Kontar, E. P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Astrophysical Journal
Publisher:The American Astronomical Society
ISSN (Online):1538-4357
Copyright Holders:Copyright © 2020 The Author(s).
First Published:First published in Astrophysical Journal 893:115
Publisher Policy:Reproduced under a Creative Commons Licence
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172031STFC 2015 DTPMartin HendryScience and Technology Facilities Council (STFC)ST/N504075/1P&S - Physics & Astronomy
173869Consolidated Grant in Solar PhysicsLyndsay FletcherScience and Technology Facilities Council (STFC)ST/P000533/1P&S - Physics & Astronomy