Solar flare radio pulsations as a signature of dynamic magnetic reconnection

By B. Kliem, Arnold O. Benz, M. Karlický. 2000

176 citations recorded by the source corpus.

Decimetric radio observations of the impulsive solar flare on October 5, 1992, 09:25 UT show a long series of quasi-periodic pulsations deeply modulating a continuum in the 0.6-2 GHz range that is slowly drifting toward lower frequencies. We propose a model in which the pulsations of the radio flux are caused by quasi-periodic particle acceleration episodes that result from a dynamic phase of magnetic reconnection in a large-scale current sheet. The reconnection is dominated by repeated formation and subsequent coalescence of magnetic islands (known as ``secondary tearing'' or ``impulsive bursty'' regime of reconnection), while a continuously growing plasmoid is fed by newly coalescing islands. Such a model, involving a current sheet and a growing plasmoid, is consistent with the Yohkoh observations of the same flare (Ohyama & Shibata 1998). We present two-dimensional MHD simulations of dynamic magnetic reconnection that support the model. Within the framework of the proposed interpretation, the radio observations reveal details of plasmoid formation in flares.

Subfields: Astronomy and Astrophysics, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/61febd179811706dac6f10a49c6dda5035404817

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Citations in the corpus

Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding (2016, methodology): “The generation of the drift compressive mode can occur due to wave–particle interaction in the presence of a sharp spatial gradient of particle energy (Klimushkin and Mager 2011) and/or an inverted (bump-on-tail) distribution. The spatial structure of drift compressive modes in a 2D inhomogeneous pl”
Quasi-Periodic Pulsations in Solar Flares (2009, background): “Kliem et al. (2000) simulated numerically evolution of long current sheet above a soft X-ray loop.”
Modelling Quasi-Periodic Pulsations in Solar and Stellar Flares (2018, background): “In Kliem et al. (2000) the authors present a 2D MHD numerical model of pulsating decimetric continuum radio bursts, caused by quasi-periodic particle acceleration, resulting from the dynamic phase of magnetic reconnection in a large-scale current sheet.”
Quasi-periodic Pulsations in Solar and Stellar Flares: An Overview of Recent Results (Invited Review) (2016, background): “Following early numerical simulations (Kliem, Karlický, and Benz, 2000), more advanced simulations concerning solar flares were performed by Bárta, Vršnak, and Karlický (2008), but the concept is studied in other fields of plasma physics as well.”