Imaging spectroscopy of solar radio burst fine structures.

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Kontar EP,Yu S,Kuznetsov AA,Emslie AG,Alcock B,Jeffrey NLS,Melnik VN,Bian NH,Subramanian P

doi

10.1038/s41467-017-01307-8

subject

Has Abstract

pub_date

2017-11-15 00:00:00

pages

1515

issue

1

issn

2041-1723

pii

10.1038/s41467-017-01307-8

journal_volume

8

pub_type

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