First spectroscopic imaging observations of the sun at low radio frequencies with the Murchison Widefield Array prototype
Date
2011
Authors
Oberoi, Divya
Matthews, Lynn D
Cairns, Iver Hugh
Emrich, David
Lobzin, Vasili
Lonsdale, Colin J
Morgan, Edward
Prabu, T
Vedantham, Harish
Wayth, Randall, B.
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IOP Publishing
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.
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Keywords
Keywords: Instrumentation: interferometers; Radiation mechanisms: non-thermal; Sun: corona; Sun: radio radiation
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Source
Astrophysical Journal, The
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Journal article
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Open Access
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