Quantifying ionospheric effects on time-domain astrophysics with the Murchison Widefield Array
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Loi, Shyeh Tjing; Murphy, Tara; Bell, Martin E.; Kaplan, D L; Lenc, E; Offringa, Andre; Hurley-Walker, Natasha; Bernardi, G; Bowman, J D; Briggs, Franklin; Cappallo, Roger C; Corey, Brian E; Deshpande, Avinash; Emrich, David; Gaensler, B M; Goeke, R; Greenhill, Lincoln; Hazelton, B; Johnston-Hollitt, M; Kasper, J.C.; Kratzenberg, Eric; Lonsdale, Colin J; Lynch, Mervyn J; McWhirter, S.R.; Mitchell, D.A.; Morales, Miguel F; Morgan, Edward H; Oberoi, D; Ord, S M; Prabu, T; Rogers, Alan; Roshi, A.; Udaya Shankar, N.; Srivani, K. S.; Subrahmanyan, R.; Tingay, S.J.; Waterson, Mark; Wayth, Randall; Webster, Rachel L; Whitney, Alan; Williams, Andrew J.; Williams, Christopher L; Kasper, Justin
Description
Refraction and diffraction of incoming radio waves by the ionosphere induce time variability in the angular positions, peak amplitudes and shapes of radio sources, potentially complicating the automated cross-matching and identification of transient and variable radio sources. In this work, we empirically assess the effects of the ionosphere on data taken by the Murchison Widefield Array (MWA) radio telescope. We directly examine 51 h of data observed over 10 nights under quiet geomagnetic...[Show more]
dc.contributor.author | Loi, Shyeh Tjing | |
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dc.contributor.author | Murphy, Tara | |
dc.contributor.author | Bell, Martin E. | |
dc.contributor.author | Kaplan, D L | |
dc.contributor.author | Lenc, E | |
dc.contributor.author | Offringa, Andre | |
dc.contributor.author | Hurley-Walker, Natasha | |
dc.contributor.author | Bernardi, G | |
dc.contributor.author | Bowman, J D | |
dc.contributor.author | Briggs, Franklin | |
dc.contributor.author | Cappallo, Roger C | |
dc.contributor.author | Corey, Brian E | |
dc.contributor.author | Deshpande, Avinash | |
dc.contributor.author | Emrich, David | |
dc.contributor.author | Gaensler, B M | |
dc.contributor.author | Goeke, R | |
dc.contributor.author | Greenhill, Lincoln | |
dc.contributor.author | Hazelton, B | |
dc.contributor.author | Johnston-Hollitt, M | |
dc.contributor.author | Kasper, J.C. | |
dc.contributor.author | Kratzenberg, Eric | |
dc.contributor.author | Lonsdale, Colin J | |
dc.contributor.author | Lynch, Mervyn J | |
dc.contributor.author | McWhirter, S.R. | |
dc.contributor.author | Mitchell, D.A. | |
dc.contributor.author | Morales, Miguel F | |
dc.contributor.author | Morgan, Edward H | |
dc.contributor.author | Oberoi, D | |
dc.contributor.author | Ord, S M | |
dc.contributor.author | Prabu, T | |
dc.contributor.author | Rogers, Alan | |
dc.contributor.author | Roshi, A. | |
dc.contributor.author | Udaya Shankar, N. | |
dc.contributor.author | Srivani, K. S. | |
dc.contributor.author | Subrahmanyan, R. | |
dc.contributor.author | Tingay, S.J. | |
dc.contributor.author | Waterson, Mark | |
dc.contributor.author | Wayth, Randall | |
dc.contributor.author | Webster, Rachel L | |
dc.contributor.author | Whitney, Alan | |
dc.contributor.author | Williams, Andrew J. | |
dc.contributor.author | Williams, Christopher L | |
dc.contributor.author | Kasper, Justin | |
dc.date.accessioned | 2018-11-29T22:53:43Z | |
dc.date.available | 2018-11-29T22:53:43Z | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/1885/152557 | |
dc.description.abstract | Refraction and diffraction of incoming radio waves by the ionosphere induce time variability in the angular positions, peak amplitudes and shapes of radio sources, potentially complicating the automated cross-matching and identification of transient and variable radio sources. In this work, we empirically assess the effects of the ionosphere on data taken by the Murchison Widefield Array (MWA) radio telescope. We directly examine 51 h of data observed over 10 nights under quiet geomagnetic conditions (global storm index Kp < 2), analysing the behaviour of short-time-scale angular position and peak flux density variations of around ten thousand unresolved sources. We find that while much of the variation in angular position can be attributed to ionospheric refraction, the characteristic displacements (10-20 arcsec) at 154 MHz are small enough that search radii of 1-2 arcmin should be sufficient for crossmatching under typical conditions. By examining bulk trends in amplitude variability, we place upper limits on the modulation index associated with ionospheric scintillation of 1-3 per cent for the various nights. For sources fainter than ~1 Jy, this variation is below the image noise at typical MWA sensitivities. Our results demonstrate that the ionosphere is not a significant impediment to the goals of time-domain science with the MWA at 154 MHz. | |
dc.format.mimetype | application/pdf | |
dc.publisher | Blackwell Publishing Ltd | |
dc.source | Monthly Notices of the Royal Astronomical Society | |
dc.title | Quantifying ionospheric effects on time-domain astrophysics with the Murchison Widefield Array | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 453 | |
dc.date.issued | 2015 | |
local.identifier.absfor | 020100 - ASTRONOMICAL AND SPACE SCIENCES | |
local.identifier.ariespublication | U3488905xPUB6814 | |
local.type.status | Published Version | |
local.contributor.affiliation | Loi, Shyeh Tjing, University of Sydney | |
local.contributor.affiliation | Murphy, Tara, University of Sydney | |
local.contributor.affiliation | Bell, Martin E., ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) | |
local.contributor.affiliation | Kaplan, D L, University of Wisconsin-Milwaukee | |
local.contributor.affiliation | Lenc, E, University of Sydney | |
local.contributor.affiliation | Offringa, Andre, College of Science, ANU | |
local.contributor.affiliation | Hurley-Walker, Natasha, Curtin University | |
local.contributor.affiliation | Bernardi, G, Harvard-Smithsonian Center for Astrophysics | |
local.contributor.affiliation | Bowman, J D, Arizona State University | |
local.contributor.affiliation | Briggs, Franklin, College of Science, ANU | |
local.contributor.affiliation | Cappallo, Roger C, Massachusetts Institute of Technology | |
local.contributor.affiliation | Corey, Brian E, Massachusetts Institute of Technology | |
local.contributor.affiliation | Deshpande, Avinash, Raman Research Institute | |
local.contributor.affiliation | Emrich, David, Curtin University | |
local.contributor.affiliation | Gaensler, B M, University of Sydney | |
local.contributor.affiliation | Goeke, R, Massachusetts Institute of Technology | |
local.contributor.affiliation | Greenhill, Lincoln, Harvard-Smithsonian Center for Astrophysics | |
local.contributor.affiliation | Hazelton, B, University of Washington | |
local.contributor.affiliation | Johnston-Hollitt, M, University of Wellington | |
local.contributor.affiliation | Kasper, J.C., University of Michigan | |
local.contributor.affiliation | Kratzenberg, Eric, Massachusetts Institute of Technology | |
local.contributor.affiliation | Lonsdale, Colin J, Massachusetts Institute of Technology | |
local.contributor.affiliation | Lynch, Mervyn J, Curtin University of Technology | |
local.contributor.affiliation | McWhirter, S.R., Massachusetts Institute of Technology | |
local.contributor.affiliation | Mitchell, D.A., ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) | |
local.contributor.affiliation | Morales, Miguel F, University of Washington | |
local.contributor.affiliation | Morgan, Edward H, MIT Kavli Institue Massachusetts Institute of Technology | |
local.contributor.affiliation | Oberoi, D, National Centre for Radio Astrophysics | |
local.contributor.affiliation | Ord, S M, Curtin University | |
local.contributor.affiliation | Prabu, T, Raman Research Institute | |
local.contributor.affiliation | Rogers, Alan, Haystack Observatory | |
local.contributor.affiliation | Roshi, A., National Radio Astronomy Observatory (NRAO) | |
local.contributor.affiliation | Udaya Shankar, N., Raman Research Institute | |
local.contributor.affiliation | Srivani, K. S., Raman Research Institute | |
local.contributor.affiliation | Subrahmanyan, R., ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) | |
local.contributor.affiliation | Tingay, S.J., ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) | |
local.contributor.affiliation | Waterson, Mark, College of Science, ANU | |
local.contributor.affiliation | Wayth, Randall, Curtin University | |
local.contributor.affiliation | Webster, Rachel L, University of Melbourne | |
local.contributor.affiliation | Whitney, Alan, Haystack Observatory | |
local.contributor.affiliation | Williams, Andrew J., Curtin University | |
local.contributor.affiliation | Williams, Christopher L, MIT Kavli Institute for Astrophysics and Space Research | |
local.contributor.affiliation | Kasper, Justin, Harvard–Smithsonian Center for Astrophysics | |
local.bibliographicCitation.issue | 3 | |
local.bibliographicCitation.startpage | 2731 | |
local.bibliographicCitation.lastpage | 2746 | |
local.identifier.doi | 10.1093/mnras/stv1808 | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2018-11-29T07:54:42Z | |
local.identifier.scopusID | 2-s2.0-84947755727 | |
local.identifier.thomsonID | 000363649000040 | |
dcterms.accessRights | Open Access | |
Collections | ANU Research Publications |
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