Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array
Low‐frequency, wide field‐of‐view (FOV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be sampled at high spatial completeness. We present the results of the first power spectrum analysis of ionospheric fluctuations in MWA data, where we examined the position o...
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| Veröffentlicht in: | Radio science 2015-07, Vol.50 (7), p.574-597 |
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| creator | Loi, Shyeh Tjing Trott, Cathryn M. Murphy, Tara Cairns, Iver H. Bell, Martin Hurley-Walker, Natasha Morgan, John Lenc, Emil Offringa, A. R. Feng, L. Hancock, P. J. Kaplan, D. L. Kudryavtseva, N. Bernardi, G. Bowman, J. D. Briggs, F. Cappallo, R. J. Corey, B. E. Deshpande, A. A. Emrich, D. Gaensler, B. M. Goeke, R. Greenhill, L. J. Hazelton, B. J. Johnston-Hollitt, M. Kasper, J. C. Kratzenberg, E. Lonsdale, C. J. Lynch, M. J. McWhirter, S. R. Mitchell, D. A. Morales, M. F. Morgan, E. Oberoi, D. Ord, S. M. Prabu, T. Rogers, A. E. E. Roshi, A. Shankar, N. Udaya Srivani, K. S. Subrahmanyan, R. Tingay, S. J. Waterson, M. Wayth, R. B. Webster, R. L. Whitney, A. R. Williams, A. Williams, C. L. |
| description | Low‐frequency, wide field‐of‐view (FOV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be sampled at high spatial completeness. We present the results of the first power spectrum analysis of ionospheric fluctuations in MWA data, where we examined the position offsets of radio sources appearing in two data sets. The refractive shifts in the positions of celestial sources are proportional to spatial gradients in the electron column density transverse to the line of sight. These can be used to probe plasma structures and waves in the ionosphere. The regional (10–100 km) scales probed by the MWA, determined by the size of its FOV and the spatial density of radio sources (typically thousands in a single FOV), complement the global (100–1000 km) scales of GPS studies and local (0.01–1 km) scales of radar scattering measurements. Our data exhibit a range of complex structures and waves. Some fluctuations have the characteristics of traveling ionospheric disturbances, while others take the form of narrow, slowly drifting bands aligned along the Earth's magnetic field.
Key Points
First spatiotemporal power spectrum analysis of ionospheric structures by MWA
High sampling completeness and large FOV of MWA allow it to image ionosphere
Detect plane wavelike structures, including TIDs and field‐aligned ducts |
| doi_str_mv | 10.1002/2015RS005711 |
| format | Article |
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Key Points
First spatiotemporal power spectrum analysis of ionospheric structures by MWA
High sampling completeness and large FOV of MWA allow it to image ionosphere
Detect plane wavelike structures, including TIDs and field‐aligned ducts</description><identifier>ISSN: 0048-6604</identifier><identifier>EISSN: 1944-799X</identifier><identifier>DOI: 10.1002/2015RS005711</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Arrays ; Completeness ; Density ; Earth science ; Fluctuation ; Ionosphere ; Ionospherics ; Magnetic fields ; Murchison Widefield Array ; power spectrum ; Radio ; Radio telescopes ; Spectrum analysis</subject><ispartof>Radio science, 2015-07, Vol.50 (7), p.574-597</ispartof><rights>2015. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5188-f88c75d03b5dcb942fe7a85a43ec463ab8c00fccfe1837a0abec17858f8919fc3</citedby><cites>FETCH-LOGICAL-c5188-f88c75d03b5dcb942fe7a85a43ec463ab8c00fccfe1837a0abec17858f8919fc3</cites><orcidid>0000-0002-6528-4548</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2015RS005711$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2015RS005711$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,1427,11493,27901,27902,45550,45551,46384,46443,46808,46867</link.rule.ids></links><search><creatorcontrib>Loi, Shyeh Tjing</creatorcontrib><creatorcontrib>Trott, Cathryn M.</creatorcontrib><creatorcontrib>Murphy, Tara</creatorcontrib><creatorcontrib>Cairns, Iver H.</creatorcontrib><creatorcontrib>Bell, Martin</creatorcontrib><creatorcontrib>Hurley-Walker, Natasha</creatorcontrib><creatorcontrib>Morgan, John</creatorcontrib><creatorcontrib>Lenc, Emil</creatorcontrib><creatorcontrib>Offringa, A. R.</creatorcontrib><creatorcontrib>Feng, L.</creatorcontrib><creatorcontrib>Hancock, P. J.</creatorcontrib><creatorcontrib>Kaplan, D. L.</creatorcontrib><creatorcontrib>Kudryavtseva, N.</creatorcontrib><creatorcontrib>Bernardi, G.</creatorcontrib><creatorcontrib>Bowman, J. D.</creatorcontrib><creatorcontrib>Briggs, F.</creatorcontrib><creatorcontrib>Cappallo, R. J.</creatorcontrib><creatorcontrib>Corey, B. E.</creatorcontrib><creatorcontrib>Deshpande, A. A.</creatorcontrib><creatorcontrib>Emrich, D.</creatorcontrib><creatorcontrib>Gaensler, B. M.</creatorcontrib><creatorcontrib>Goeke, R.</creatorcontrib><creatorcontrib>Greenhill, L. J.</creatorcontrib><creatorcontrib>Hazelton, B. J.</creatorcontrib><creatorcontrib>Johnston-Hollitt, M.</creatorcontrib><creatorcontrib>Kasper, J. C.</creatorcontrib><creatorcontrib>Kratzenberg, E.</creatorcontrib><creatorcontrib>Lonsdale, C. J.</creatorcontrib><creatorcontrib>Lynch, M. J.</creatorcontrib><creatorcontrib>McWhirter, S. 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L.</creatorcontrib><title>Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array</title><title>Radio science</title><addtitle>Radio Sci</addtitle><description>Low‐frequency, wide field‐of‐view (FOV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be sampled at high spatial completeness. We present the results of the first power spectrum analysis of ionospheric fluctuations in MWA data, where we examined the position offsets of radio sources appearing in two data sets. The refractive shifts in the positions of celestial sources are proportional to spatial gradients in the electron column density transverse to the line of sight. These can be used to probe plasma structures and waves in the ionosphere. The regional (10–100 km) scales probed by the MWA, determined by the size of its FOV and the spatial density of radio sources (typically thousands in a single FOV), complement the global (100–1000 km) scales of GPS studies and local (0.01–1 km) scales of radar scattering measurements. Our data exhibit a range of complex structures and waves. Some fluctuations have the characteristics of traveling ionospheric disturbances, while others take the form of narrow, slowly drifting bands aligned along the Earth's magnetic field.
Key Points
First spatiotemporal power spectrum analysis of ionospheric structures by MWA
High sampling completeness and large FOV of MWA allow it to image ionosphere
Detect plane wavelike structures, including TIDs and field‐aligned ducts</description><subject>Arrays</subject><subject>Completeness</subject><subject>Density</subject><subject>Earth science</subject><subject>Fluctuation</subject><subject>Ionosphere</subject><subject>Ionospherics</subject><subject>Magnetic fields</subject><subject>Murchison Widefield Array</subject><subject>power spectrum</subject><subject>Radio</subject><subject>Radio telescopes</subject><subject>Spectrum analysis</subject><issn>0048-6604</issn><issn>1944-799X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNqN0U1rGzEQBmBRGqjr9NYfIOilh24y2pVW2qNxEieQL5LUzk3I8ggrXVuOtIvjf581W0LooeQ0MDzvMMwQ8p3BEQPIj3Ng4u4eQEjGPpEBqzjPZFU9fiYDAK6ysgT-hXxN6QmAcVHyAZnehi1GmjZom9iuqFmbepd8osFRH9YhbZYYvaWubm3TmqbrJbr1zZI2S6RXbbRLn8KazvwCncd6QUcxmt0hOXCmTvjtbx2S32enD-Pz7PJmcjEeXWZWMKUyp5SVYgHFXCzsvOK5Q2mUMLxAy8vCzJUFcNY6ZKqQBswcLZNKKKcqVjlbDMnPfu4mhucWU6NXPlmsa7PG0CbNZAEsz3OhPkCZ5JXkQnb0xz_0KbSxu8xeAeey7HCnfvXKxpBSRKc30a9M3GkGev8P_f4fHc97vvU17v5r9d3JfQ790lkf8qnBl7eQiX90KQsp9Ox6omfTqSrVyUQ_FK96aptY</recordid><startdate>201507</startdate><enddate>201507</enddate><creator>Loi, Shyeh Tjing</creator><creator>Trott, Cathryn M.</creator><creator>Murphy, Tara</creator><creator>Cairns, Iver H.</creator><creator>Bell, Martin</creator><creator>Hurley-Walker, Natasha</creator><creator>Morgan, John</creator><creator>Lenc, Emil</creator><creator>Offringa, A. 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E. ; Deshpande, A. A. ; Emrich, D. ; Gaensler, B. M. ; Goeke, R. ; Greenhill, L. J. ; Hazelton, B. J. ; Johnston-Hollitt, M. ; Kasper, J. C. ; Kratzenberg, E. ; Lonsdale, C. J. ; Lynch, M. J. ; McWhirter, S. R. ; Mitchell, D. A. ; Morales, M. F. ; Morgan, E. ; Oberoi, D. ; Ord, S. M. ; Prabu, T. ; Rogers, A. E. E. ; Roshi, A. ; Shankar, N. Udaya ; Srivani, K. S. ; Subrahmanyan, R. ; Tingay, S. J. ; Waterson, M. ; Wayth, R. B. ; Webster, R. L. ; Whitney, A. R. ; Williams, A. ; Williams, C. 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L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array</atitle><jtitle>Radio science</jtitle><addtitle>Radio Sci</addtitle><date>2015-07</date><risdate>2015</risdate><volume>50</volume><issue>7</issue><spage>574</spage><epage>597</epage><pages>574-597</pages><issn>0048-6604</issn><eissn>1944-799X</eissn><abstract>Low‐frequency, wide field‐of‐view (FOV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be sampled at high spatial completeness. We present the results of the first power spectrum analysis of ionospheric fluctuations in MWA data, where we examined the position offsets of radio sources appearing in two data sets. The refractive shifts in the positions of celestial sources are proportional to spatial gradients in the electron column density transverse to the line of sight. These can be used to probe plasma structures and waves in the ionosphere. The regional (10–100 km) scales probed by the MWA, determined by the size of its FOV and the spatial density of radio sources (typically thousands in a single FOV), complement the global (100–1000 km) scales of GPS studies and local (0.01–1 km) scales of radar scattering measurements. Our data exhibit a range of complex structures and waves. Some fluctuations have the characteristics of traveling ionospheric disturbances, while others take the form of narrow, slowly drifting bands aligned along the Earth's magnetic field.
Key Points
First spatiotemporal power spectrum analysis of ionospheric structures by MWA
High sampling completeness and large FOV of MWA allow it to image ionosphere
Detect plane wavelike structures, including TIDs and field‐aligned ducts</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2015RS005711</doi><tpages>24</tpages><orcidid>https://orcid.org/0000-0002-6528-4548</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Radio science, 2015-07, Vol.50 (7), p.574-597 |
| issn | 0048-6604 1944-799X |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1730122258 |
| source | Wiley-Blackwell AGU Digital Library; Wiley Online Library Journals Frontfile Complete; Wiley Online Library Free Content; EZB-FREE-00999 freely available EZB journals |
| subjects | Arrays Completeness Density Earth science Fluctuation Ionosphere Ionospherics Magnetic fields Murchison Widefield Array power spectrum Radio Radio telescopes Spectrum analysis |
| title | Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-05T15%3A30%3A54IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Power%20spectrum%20analysis%20of%20ionospheric%20fluctuations%20with%20the%20Murchison%20Widefield%20Array&rft.jtitle=Radio%20science&rft.au=Loi,%20Shyeh%20Tjing&rft.date=2015-07&rft.volume=50&rft.issue=7&rft.spage=574&rft.epage=597&rft.pages=574-597&rft.issn=0048-6604&rft.eissn=1944-799X&rft_id=info:doi/10.1002/2015RS005711&rft_dat=%3Cproquest_cross%3E3780168741%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1704476171&rft_id=info:pmid/&rfr_iscdi=true |