Rates, flux densities, and spectral indices of meteor radio afterglows
©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 f...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Published: |
Wiley-Blackwell Publishing
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/6473 |
| _version_ | 1848745085799235584 |
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| author | Obenberger, K. Dowell, J. Hancock, Paul Holmes, J. Pedersen, T. Schinzel, F. Taylor, G. |
| author_facet | Obenberger, K. Dowell, J. Hancock, Paul Holmes, J. Pedersen, T. Schinzel, F. Taylor, G. |
| author_sort | Obenberger, K. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | ©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. |
| first_indexed | 2025-11-14T06:11:45Z |
| format | Journal Article |
| id | curtin-20.500.11937-6473 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:11:45Z |
| publishDate | 2016 |
| publisher | Wiley-Blackwell Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-64732018-03-29T09:05:44Z Rates, flux densities, and spectral indices of meteor radio afterglows Obenberger, K. Dowell, J. Hancock, Paul Holmes, J. Pedersen, T. Schinzel, F. Taylor, G. ©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. 2016 Journal Article http://hdl.handle.net/20.500.11937/6473 10.1002/2016JA022606 Wiley-Blackwell Publishing restricted |
| spellingShingle | Obenberger, K. Dowell, J. Hancock, Paul Holmes, J. Pedersen, T. Schinzel, F. Taylor, G. Rates, flux densities, and spectral indices of meteor radio afterglows |
| title | Rates, flux densities, and spectral indices of meteor radio afterglows |
| title_full | Rates, flux densities, and spectral indices of meteor radio afterglows |
| title_fullStr | Rates, flux densities, and spectral indices of meteor radio afterglows |
| title_full_unstemmed | Rates, flux densities, and spectral indices of meteor radio afterglows |
| title_short | Rates, flux densities, and spectral indices of meteor radio afterglows |
| title_sort | rates, flux densities, and spectral indices of meteor radio afterglows |
| url | http://hdl.handle.net/20.500.11937/6473 |