Imaging spectroscopy of solar radio burst fine structures

Kontar, E.P. , Yu, S., Kuznetsov, A.A., Emslie, A.G., Alcock, B. , Jeffrey, N.L.S. , Melnik, V.N., Bian, N.H. and Subramanian, P. (2017) Imaging spectroscopy of solar radio burst fine structures. Nature Communications, 8, 1515. (doi:10.1038/s41467-017-01307-8) (PMID:29142220) (PMCID:PMC5688146)

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Abstract

Solar radio observations provide a unique diagnostic of the outer solar atmosphere. However, the inhomogeneous turbulent corona strongly affects the propagation of the emitted radio waves, so decoupling the intrinsic properties of the emitting source from the effects of radio wave propagation has long been a major challenge in solar physics. Here we report quantitative spatial and frequency characterization of solar radio burst fine structures observed with the Low Frequency Array, an instrument with high-time resolution that also permits imaging at scales much shorter than those corresponding to radio wave propagation in the corona. The observations demonstrate that radio wave propagation effects, and not the properties of the intrinsic emission source, dominate the observed spatial characteristics of radio burst images. These results permit more accurate estimates of source brightness temperatures, and open opportunities for quantitative study of the mechanisms that create the turbulent coronal medium through which the emitted radiation propagates.

Item Type:Articles
Additional Information:A correction to this article is available at https://doi.org/10.1038/s41467-017-02464-6.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kontar, Dr Eduard and Jeffrey, Dr Natasha and Bian, Dr Nicolas Horace and Alcock, Benjamin
Authors: Kontar, E.P., Yu, S., Kuznetsov, A.A., Emslie, A.G., Alcock, B., Jeffrey, N.L.S., Melnik, V.N., Bian, N.H., and Subramanian, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nature Communications
Publisher:Nature Publishing Group
ISSN:2041-1723
ISSN (Online):2041-1723
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Nature Communications 8:1515
Publisher Policy:Reproduced under a Creative Commons License
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
631581Consolidated grant in solar and astrophysical plasmasLyndsay FletcherScience & Technology Facilities Council (STFC)ST/L000741/1S&E P&A - PHYSICS & ASTRONOMY