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Title:
Limits on radio emission from meteors using the MWA
Authors:
Zhang, X.; Hancock, P.; Devillepoix, H. A. R.; Wayth, R. B.; Beardsley, A.; Crosse, B.; Emrich, D.; Franzen, T. M. O.; Gaensler, B. M.; Horsley, L.; Johnston-Hollitt, M.; Kaplan, D. L.; Kenney, D.; Morales, M. F.; Pallot, D.; Steele, K.; Tingay, S. J.; Trott, C. M.; Walker, M.; Williams, A.; Wu, C.; Ji, Jianghui; Ma, Yuehua
Affiliation:
AA(CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China; International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Sydney, NSW 2006, Australia 0000-0002-2218-5638), AB(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Sydney, NSW 2006, Australia), AC(School of Earth and Planetary Sciences, Curtin University, Bentley, WA 6102, Australia), AD(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Sydney, NSW 2006, Australia), AE(School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA), AF(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AG(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AH(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AI(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Sydney, NSW 2006, Australia; Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006, Australia; Dunlap Institute for Astronomy and Astrophysics, University of Toronto, ON M5S 3H4, Canada 0000-0002-3382-9558), AJ(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AK(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; Peripety Scientific Ltd., PO Box 11355 Manners Street, Wellington 6142, New Zealand), AL(Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA), AM(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AN(Department of Physics, University of Washington, Seattle, WA 98195, USA), AO(International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia), AP(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AQ(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Sydney, NSW 2006, Australia), AR(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Sydney, NSW 2006, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Bentley, W 6102, Australia), AS(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AT(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AU(International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia), AV(CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China 0000-0002-9260-1537), AW(CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 477, Issue 4, p.5167-5176 (MNRAS Homepage)
Publication Date:
07/2018
Origin:
OUP
Astronomy Keywords:
plasmas, instrumentation: interferometers, meteorites, meteors, meteoroids
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sty930
Bibliographic Code:
2018MNRAS.477.5167Z

Abstract

Recently, low-frequency, broad-band radio emission has been observed accompanying bright meteors by the Long Wavelength Array (LWA). The broad-band spectra between 20 and 60 MHz were captured for several events, while the spectral index (dependence of flux density on frequency, with Snu ∝ nualpha) was estimated to be -4 ± 1 during the peak of meteor afterglows. Here we present a survey of meteor emission and other transient events using the Murchison Wide Field Array (MWA) at 72-103 MHz. In our 322 h survey, down to a 5sigma detection threshold of 3.5 Jy beam-1, no transient candidates were identified as intrinsic emission from meteors. We derived an upper limit of -3.7 (95 per cent confidence limit) on the spectral index in our frequency range. We also report detections of other transient events, such as reflected FM broadcast signals from small satellites, conclusively demonstrating the ability of the MWA to detect and track space debris on scales as small as 0.1 m in low Earth orbits.
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