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    Rates, flux densities, and spectral indices of meteor radio afterglows

    Access Status
    Fulltext not available
    Authors
    Obenberger, K.
    Dowell, J.
    Hancock, Paul
    Holmes, J.
    Pedersen, T.
    Schinzel, F.
    Taylor, G.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Obenberger, K. and Dowell, J. and Hancock, P. and Holmes, J. and Pedersen, T. and Schinzel, F. and Taylor, G. 2016. Rates, flux densities, and spectral indices of meteor radio afterglows. Journal of Geophysical Research: Space Physics. 121 (7): pp. 6808-6817.
    Source Title
    Journal of Geophysical Research: Space Physics
    DOI
    10.1002/2016JA022606
    ISSN
    2169-9380
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/6473
    Collection
    • Curtin Research Publications
    Abstract

    ©2016. American Geophysical Union. All Rights Reserved. Using the narrowband all-sky imager mode of the Long Wavelength Array (LWA1), we have now detected 30 transients at 25.6 MHz, 1 at 34 MHz, and 93 at 38.0 MHz. While we have only optically confirmed that 37 of these events are radio afterglows from meteors, evidence suggests that most, if not all, are. Using the beam-forming mode of the LWA1, we have also captured the broadband spectra between 22.0 and 55.0 MHz of four events. We compare the smooth, spectral components of these four events and fit the frequency-dependent flux density to a power law, and find that the spectral index is time variable, with the spectrum steepening over time for each meteor afterglow. Using these spectral indices along with the narrowband flux density measurements of the 123 events at 25.6 and 38 MHz, we predict the expected flux densities and rates for meteor afterglows potentially observable by other low-frequency radio telescopes.

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