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		<doi>10.5194/angeo-35-393-2017</doi>
		<issn>0992-7689</issn>
		<citationkey>RodriguesPaulZewd:2017:HiCoBa</citationkey>
		<title>High-resolution coherent backscatter interferometric radar images of equatorial spread F using Capon's method</title>
		<year>2017</year>
		<month>Mar.</month>
		<typeofwork>journal article</typeofwork>
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		<author>Rodrigues, Fabiano S.,</author>
		<author>Paula, Eurico Rodrigues de,</author>
		<author>Zewdie, Gebreab K.,</author>
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		<group>DIDAE-CGCEA-INPE-MCTIC-GOV-BR</group>
		<affiliation>The University of Texas at Dallas</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>The University of Texas at Dallas</affiliation>
		<electronicmailaddress>fabiano@utdallas.edu</electronicmailaddress>
		<electronicmailaddress>eurico.paula@inpe.br</electronicmailaddress>
		<journal>Annales Geophysicae</journal>
		<volume>35</volume>
		<number>3</number>
		<pages>393-402</pages>
		<secondarymark>A2_INTERDISCIPLINAR A2_GEOCIÊNCIAS A2_ENGENHARIAS_I B2_CIÊNCIAS_BIOLÓGICAS_I B2_ASTRONOMIA_/_FÍSICA</secondarymark>
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		<keywords>instruments and techniques), ionospheric physics, Radio science (interferometry.</keywords>
		<abstract>We present results of Capon's method for estimation of in-beam images of ionospheric scattering structures observed by a small, low-power coherent backscatter interferometer. The radar interferometer operated in the equatorial site of São Luís, Brazil (2.59°&#285;S, 44.21°&#285;W, &#285;'2.35° dip latitude). We show numerical simulations that evaluate the performance of the Capon method for typical F region measurement conditions. Numerical simulations show that, despite the short baselines of the São Luís radar, the Capon technique is capable of distinguishing localized features with kilometric scale sizes (in the zonal direction) at F region heights. Following the simulations, we applied the Capon algorithm to actual measurements made by the São Luís interferometer during a typical equatorial spread F (ESF) event. As indicated by the simulations, the Capon method produced images that were better resolved than those produced by the Fourier method. The Capon images show narrow (a few kilometers wide) scattering channels associated with ESF plumes and scattering regions spaced by only a few tens of kilometers in the zonal direction. The images are also capable of resolving bifurcations and the C shape of scattering structures.</abstract>
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		<language>en</language>
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