First Spectroscopic Imaging Observations of the Sun at Low Radio Frequencies with the Murchison Widefield Array Prototype
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Hewitt_First spectroscopic.pdf
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Author(s)
Oberoi, Divya
Matthews, Lynn D.
Lonsdale, Colin John
Benkevitch, Leonid
Derome, Mark F.
Kennedy, Rachel
Kincaid, Barton B.
McWhirter, Stephen R.
Salah, Joseph E.
Rogers, Alan E E
Date Issued
January 2011
Journal
Astrophysical Journal. Letters
Publisher
IOP Publishing
Citation
Oberoi, Divya et al. “First Spectroscopic Imaging Observations of the Sun at Low Radio Frequencies with the Murchison Widefield Array Prototype.” The Astrophysical Journal 728.2 (2011): L27.
Version
Author's final manuscript
Abstract
We present the first spectroscopic images of solar radio transients from the prototype for the Murchison Widefield Array, observed on 2010 March 27. Our observations span the instantaneous frequency band 170.9–201.6 MHz. Though our observing period is characterized as a period of “low” to “medium” activity, one broadband emission feature and numerous short-lived, narrowband, non-thermal emission features are evident.
Our data represent a significant advance in low radio frequency solar imaging, enabling us to follow the spatial, spectral, and temporal evolution of events simultaneously and in unprecedented detail. The rich variety of features seen here reaffirms the coronal diagnostic capability of low radio frequency emission and provides an early glimpse
of the nature of radio observations that will become available as the next generation of low-frequency radio interferometers come online over the next few years.
MIT Department
Haystack Observatory
MIT Kavli Institute for Astrophysics and Space Research
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1088/2041-8205/728/2/L27
