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Title: First spectroscopic imaging observations of the sun at low radio frequencies with the Murchison widefield array prototype
Authors: Oberoi, Divya
Matthews, Lynn D.
Cairns, Iver H
Emrich, D.
Prabu, T.
Vedantham, Harish
Gopalakrishna, M.R.
Madhavi, S.
Roshi, Anish D.
Udaya Shankar, N.
Srivani, K.S.
Kamini, P.A.
Subrahmanyan, Ravi
+56 Co-authors
Keywords: instrumentation: interferometers
radiation mechanisms
non-thermal; Sun: corona
Sun: radio radiation
Issue Date: 20-Feb-2011
Publisher: IOP Publishing Ltd for the American Astronomical Society
Citation: Astrophysical Journal Letters, 2011, Vol.728, pL27
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.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 2041-8213 (Online)
Alternative Location:
Copyright: 2011 American Astronomical Society,
Appears in Collections:Research Papers (A&A)

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