First spectroscopic imaging observations of the sun at low radio frequencies with the Murchison Widefield Array prototype

Divya Oberoi, Lynn D Matthews, Iver H Cairns, David Emrich, Vasili Lobzin, Colin J Lonsdale, Edward H Morgan, Thiagaraj Prabu, Harish Vedantham, Randall B Wayth, Andrew J Williams, Christopher L Williams, Stephen M White, Graham R Allen, Wayne Arcus, David Graeme Barnes, Leonid V Benkevitch, Gianni Bernardi, Judd D Bowman, Frank H BriggsJohn D Bunton, Stephen M Burns, Roger J Cappallo, Michael A Clark, Brian E Corey, Murray I Dawson, David R DeBoer, Andre De Gans, Ludovico deSouza, Mark Derome, Richard G Edgar, Troy Elton, Robert F Goeke, M R Gopala Krishna, Lincoln J Greenhill, Bryna J Hazelton, David Edwin Herne, Jacqueline N Hewitt, P A Kamini, David L Kaplan, Justin C Kasper, Rachel Kennedy, Barton B Kincaid, Jonathon Kocz, Ronald Koenig, Errol Kowald, Mervyn John Lynch, S Madhavi, Stephen Russell McWhirter, Daniel A Mitchell, Miguel F Morales, Andrew Ng, Stephen M Ord, Joseph Pathikulangara, Alan E E Rogers, Anish Roshi, Joseph E Salah, Robert John Sault, Antony Schinckel, Natarajan Udaya-Shankar, K S Srivani, Jamie B Stevens, Ravi Subrahmanyan, Darshan Thakkar, Steven John Tingay, Tuthill John, Annino Vaccarella, Mark F Waterson, Rachel Lindsey Webster, Alan R Whitney

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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.
Original languageEnglish
Pages (from-to)1 - 7
Number of pages7
JournalThe Astrophysical Journal Letters
Volume728
Issue number2
DOIs
Publication statusPublished - 2011

Cite this

Oberoi, D., Matthews, L. D., Cairns, I. H., Emrich, D., Lobzin, V., Lonsdale, C. J., Morgan, E. H., Prabu, T., Vedantham, H., Wayth, R. B., Williams, A. J., Williams, C. L., White, S. M., Allen, G. R., Arcus, W., Barnes, D. G., Benkevitch, L. V., Bernardi, G., Bowman, J. D., ... Whitney, A. R. (2011). First spectroscopic imaging observations of the sun at low radio frequencies with the Murchison Widefield Array prototype. The Astrophysical Journal Letters, 728(2), 1 - 7. https://doi.org/10.1088/2041-8205/728/2/L27