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, T. Prabu, Harish Vedantham, Randall B. Wayth, Andrew Williams, Christopher Williams, Stephen M. White, G. Allen, Wayne Arcus, David Barnes, Leonid Benkevitch, Gianni Bernardi, Judd Bowman, Frank H. BriggsJohn D. Bunton, Steve Burns, Roger C. Cappallo, M. A. Clark, Brian E. Corey, M. Dawson, David Deboer, A. De Gans, Ludi Desouza, Mark Derome, R. G. Edgar, T. Elton, Robert Goeke, M. R. Gopalakrishna, Lincoln J. Greenhill, Bryna Hazelton, David Herne, Jacqueline N. Hewitt, P. A. Kamini, David L. Kaplan, Justin C. Kasper, Rachel Kennedy, Barton B. Kincaid, Jonathan Kocz, R. Koeing, Errol Kowald, Mervyn J. Lynch, S. Madhavi, Stephen R. McWhirter, Daniel A. Mitchell, Miguel F. Morales, A. Ng, Stephen M. Ord, Joseph Pathikulangara, Alan E E Rogers, Anish Roshi, Joseph E. Salah, Robert J. Sault, Antony Schinckel, N. Udaya Shankar, K. S. Srivani, Jamie Stevens, Ravi Subrahmanyan, D. Thakkar, Steven J. Tingay, J. Tuthill, Annino Vaccarella, Mark Waterson, Rachel L. Webster, Alan R. Whitney

Research output: Contribution to journalArticle

32 Citations (Scopus)

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 (US)
JournalAstrophysical Journal Letters
Volume728
Issue number2 PART II
DOIs
StatePublished - Feb 20 2011

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radio frequencies
sun
prototypes
radio
low frequencies
radio interferometers
nonthermal radiation
radio observation
narrowband
broadband
temporal evolution
interferometer

Keywords

  • Instrumentation: interferometers
  • Radiation mechanisms: non-thermal
  • Sun: corona
  • Sun: radio radiation

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Oberoi, D., Matthews, L. D., Cairns, I. H., Emrich, D., Lobzin, V., Lonsdale, C. J., ... Whitney, A. R. (2011). First spectroscopic imaging observations of the sun at low radio frequencies with the Murchison Widefield Array prototype. Astrophysical Journal Letters, 728(2 PART II). https://doi.org/10.1088/2041-8205/728/2/L27

First spectroscopic imaging observations of the sun at low radio frequencies with the Murchison Widefield Array prototype. / Oberoi, Divya; Matthews, Lynn D.; Cairns, Iver H.; Emrich, David; Lobzin, Vasili; Lonsdale, Colin J.; Morgan, Edward H.; Prabu, T.; Vedantham, Harish; Wayth, Randall B.; Williams, Andrew; Williams, Christopher; White, Stephen M.; Allen, G.; Arcus, Wayne; Barnes, David; Benkevitch, Leonid; Bernardi, Gianni; Bowman, Judd; Briggs, Frank H.; Bunton, John D.; Burns, Steve; Cappallo, Roger C.; Clark, M. A.; Corey, Brian E.; Dawson, M.; Deboer, David; De Gans, A.; Desouza, Ludi; Derome, Mark; Edgar, R. G.; Elton, T.; Goeke, Robert; Gopalakrishna, M. R.; Greenhill, Lincoln J.; Hazelton, Bryna; Herne, David; Hewitt, Jacqueline N.; Kamini, P. A.; Kaplan, David L.; Kasper, Justin C.; Kennedy, Rachel; Kincaid, Barton B.; Kocz, Jonathan; Koeing, R.; Kowald, Errol; Lynch, Mervyn J.; Madhavi, S.; McWhirter, Stephen R.; Mitchell, Daniel A.; Morales, Miguel F.; Ng, A.; Ord, Stephen M.; Pathikulangara, Joseph; Rogers, Alan E E; Roshi, Anish; Salah, Joseph E.; Sault, Robert J.; Schinckel, Antony; Udaya Shankar, N.; Srivani, K. S.; Stevens, Jamie; Subrahmanyan, Ravi; Thakkar, D.; Tingay, Steven J.; Tuthill, J.; Vaccarella, Annino; Waterson, Mark; Webster, Rachel L.; Whitney, Alan R.

In: Astrophysical Journal Letters, Vol. 728, No. 2 PART II, 20.02.2011.

Research output: Contribution to journalArticle

Oberoi, D, Matthews, LD, Cairns, IH, Emrich, D, Lobzin, V, Lonsdale, CJ, Morgan, EH, Prabu, T, Vedantham, H, Wayth, RB, Williams, A, Williams, C, White, SM, Allen, G, Arcus, W, Barnes, D, Benkevitch, L, Bernardi, G, Bowman, J, Briggs, FH, Bunton, JD, Burns, S, Cappallo, RC, Clark, MA, Corey, BE, Dawson, M, Deboer, D, De Gans, A, Desouza, L, Derome, M, Edgar, RG, Elton, T, Goeke, R, Gopalakrishna, MR, Greenhill, LJ, Hazelton, B, Herne, D, Hewitt, JN, Kamini, PA, Kaplan, DL, Kasper, JC, Kennedy, R, Kincaid, BB, Kocz, J, Koeing, R, Kowald, E, Lynch, MJ, Madhavi, S, McWhirter, SR, Mitchell, DA, Morales, MF, Ng, A, Ord, SM, Pathikulangara, J, Rogers, AEE, Roshi, A, Salah, JE, Sault, RJ, Schinckel, A, Udaya Shankar, N, Srivani, KS, Stevens, J, Subrahmanyan, R, Thakkar, D, Tingay, SJ, Tuthill, J, Vaccarella, A, Waterson, M, Webster, RL & Whitney, AR 2011, 'First spectroscopic imaging observations of the sun at low radio frequencies with the Murchison Widefield Array prototype', Astrophysical Journal Letters, vol. 728, no. 2 PART II. https://doi.org/10.1088/2041-8205/728/2/L27
Oberoi, Divya ; Matthews, Lynn D. ; Cairns, Iver H. ; Emrich, David ; Lobzin, Vasili ; Lonsdale, Colin J. ; Morgan, Edward H. ; Prabu, T. ; Vedantham, Harish ; Wayth, Randall B. ; Williams, Andrew ; Williams, Christopher ; White, Stephen M. ; Allen, G. ; Arcus, Wayne ; Barnes, David ; Benkevitch, Leonid ; Bernardi, Gianni ; Bowman, Judd ; Briggs, Frank H. ; Bunton, John D. ; Burns, Steve ; Cappallo, Roger C. ; Clark, M. A. ; Corey, Brian E. ; Dawson, M. ; Deboer, David ; De Gans, A. ; Desouza, Ludi ; Derome, Mark ; Edgar, R. G. ; Elton, T. ; Goeke, Robert ; Gopalakrishna, M. R. ; Greenhill, Lincoln J. ; Hazelton, Bryna ; Herne, David ; Hewitt, Jacqueline N. ; Kamini, P. A. ; Kaplan, David L. ; Kasper, Justin C. ; Kennedy, Rachel ; Kincaid, Barton B. ; Kocz, Jonathan ; Koeing, R. ; Kowald, Errol ; Lynch, Mervyn J. ; Madhavi, S. ; McWhirter, Stephen R. ; Mitchell, Daniel A. ; Morales, Miguel F. ; Ng, A. ; Ord, Stephen M. ; Pathikulangara, Joseph ; Rogers, Alan E E ; Roshi, Anish ; Salah, Joseph E. ; Sault, Robert J. ; Schinckel, Antony ; Udaya Shankar, N. ; Srivani, K. S. ; Stevens, Jamie ; Subrahmanyan, Ravi ; Thakkar, D. ; Tingay, Steven J. ; Tuthill, J. ; Vaccarella, Annino ; Waterson, Mark ; Webster, Rachel L. ; Whitney, Alan R. / First spectroscopic imaging observations of the sun at low radio frequencies with the Murchison Widefield Array prototype. In: Astrophysical Journal Letters. 2011 ; Vol. 728, No. 2 PART II.
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T1 - First spectroscopic imaging observations of the sun at low radio frequencies with the Murchison Widefield Array prototype

AU - Oberoi, Divya

AU - Matthews, Lynn D.

AU - Cairns, Iver H.

AU - Emrich, David

AU - Lobzin, Vasili

AU - Lonsdale, Colin J.

AU - Morgan, Edward H.

AU - Prabu, T.

AU - Vedantham, Harish

AU - Wayth, Randall B.

AU - Williams, Andrew

AU - Williams, Christopher

AU - White, Stephen M.

AU - Allen, G.

AU - Arcus, Wayne

AU - Barnes, David

AU - Benkevitch, Leonid

AU - Bernardi, Gianni

AU - Bowman, Judd

AU - Briggs, Frank H.

AU - Bunton, John D.

AU - Burns, Steve

AU - Cappallo, Roger C.

AU - Clark, M. A.

AU - Corey, Brian E.

AU - Dawson, M.

AU - Deboer, David

AU - De Gans, A.

AU - Desouza, Ludi

AU - Derome, Mark

AU - Edgar, R. G.

AU - Elton, T.

AU - Goeke, Robert

AU - Gopalakrishna, M. R.

AU - Greenhill, Lincoln J.

AU - Hazelton, Bryna

AU - Herne, David

AU - Hewitt, Jacqueline N.

AU - Kamini, P. A.

AU - Kaplan, David L.

AU - Kasper, Justin C.

AU - Kennedy, Rachel

AU - Kincaid, Barton B.

AU - Kocz, Jonathan

AU - Koeing, R.

AU - Kowald, Errol

AU - Lynch, Mervyn J.

AU - Madhavi, S.

AU - McWhirter, Stephen R.

AU - Mitchell, Daniel A.

AU - Morales, Miguel F.

AU - Ng, A.

AU - Ord, Stephen M.

AU - Pathikulangara, Joseph

AU - Rogers, Alan E E

AU - Roshi, Anish

AU - Salah, Joseph E.

AU - Sault, Robert J.

AU - Schinckel, Antony

AU - Udaya Shankar, N.

AU - Srivani, K. S.

AU - Stevens, Jamie

AU - Subrahmanyan, Ravi

AU - Thakkar, D.

AU - Tingay, Steven J.

AU - Tuthill, J.

AU - Vaccarella, Annino

AU - Waterson, Mark

AU - Webster, Rachel L.

AU - Whitney, Alan R.

PY - 2011/2/20

Y1 - 2011/2/20

N2 - 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.

AB - 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.

KW - Instrumentation: interferometers

KW - Radiation mechanisms: non-thermal

KW - Sun: corona

KW - Sun: radio radiation

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