Imaging Spectroscopy of Solar Radio Burst Fine Structures
arXiv:1708.06505 · doi:10.1038/s41467-017-01307-8
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 (LOFAR), 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.
arXiv comment20 pages, 9 figures
References in corpus (10)
- LOFAR: The LOw-Frequency ARray
- Implications of X-ray Observations for Electron Acceleration and Propagation in Solar Flares
- LOFAR tied-array imaging of Type III solar radio bursts
- Dynamics of electron beams in the solar corona plasma with density fluctuations
- LOFAR tied-array imaging and spectroscopy of solar S bursts
- Imaging Spectroscopy of Type U and J Solar Radio Bursts with LOFAR
- On the speed and acceleration of electron beams triggering interplanetary type III radio bursts
- Coronal turbulence and the angular broadening of radio sources - the role of the structure function
- A Scenario for the Fine Structures of Solar Type IIIb Radio Bursts Based on the Electron Cyclotron Maser Emission
- Localising fast radio bursts and other transients using interferometric arrays
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