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 Communjournal_title
Nature communicationsauthors
Kontar EP,Yu S,Kuznetsov AA,Emslie AG,Alcock B,Jeffrey NLS,Melnik VN,Bian NH,Subramanian Pdoi
10.1038/s41467-017-01307-8subject
Has Abstractpub_date
2017-11-15 00:00:00pages
1515issue
1issn
2041-1723pii
10.1038/s41467-017-01307-8journal_volume
8pub_type
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