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• W4246380082 abstract "PreviousNext No Access9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005Spectral features of F-region plasma irregularities as observed by rocket- borne electron density probes from BrazilAuthors: P. MuralikrishnaL.P. VieiraM.A. AbduP. MuralikrishnaInstituto Nacional de Pesquisas Espaciais – INPE, C.P. 515, 12 201-970, São José dos Campos-SP, BRAZILSearch for more papers by this author, L.P. VieiraInstituto Nacional de Pesquisas Espaciais – INPE, C.P. 515, 12 201-970, São José dos Campos-SP, BRAZILSearch for more papers by this author, and M.A. AbduInstituto Nacional de Pesquisas Espaciais – INPE, C.P. 515, 12 201-970, São José dos Campos-SP, BRAZILSearch for more papers by this authorhttps://doi.org/10.1190/sbgf2005-429 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract The height variation of the ionospheric electron density was measured with rocket-borne electron density probes from Alcantara (2.31°S; 35.2°W) in Brazil. A Black Brant X sounding rocket was launched on 14-th October 1994 at 1955hrs (LT) to investigate the phenomenon of high-altitude equatorial spread-F events. Ground equipments were operated during the campaign to ensure that the rocket was launched under conditions favorable for the generation of plasma bubbles in the F-region. The electron density was measured by three different types of probes. A High Frequency Capacitance probe (HFC) gave density data with low height resolution, while a conventional Langmuir Probe (LP) and a Plasma Frequency Probe (PFP) measured the electron density and the spatial fluctuations in it. The k-spectra of the plasma irregularities were obtained by the spectral analysis of the electron density fluctuation data. An important feature observed was the continuous presence of plasma irregularities of a large range of vertical scale sizes in the altitude range of 340km to 817km. The electron number density varied considerably in these spatial structures, for example a decrease by a factor of 2.6 in a vertical extension of 1km near the altitude of 497km. Near 535km altitude the electron density increased by a factor of 1.8 within a height range of 2.7km. Density structures of vertical scale sizes in the range of hundreds of meters also were observed superposed on the large scale structures. During the rocket upleg two height regions of intense irregularities were observed, one between 366 and 480km and the other between 684 and 812km. The Langmuir Probe (LP) could make measurements of irregularities of vertical scale sizes more than 8m in these height ranges, while the Plasma Frequency Probe, could make measurements of irregularities of vertical scale sizes as small as 0.5m. Spectral features of these irregularities as observed by the two plasma probes at different height regions are presented and discussed here. Keywords: density, ionosphere, plasma, high frequencyPermalink: https://doi.org/10.1190/sbgf2005-429FiguresReferencesRelatedDetails 9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005ISSN (online):2159-6832Copyright: 2005 Pages: 2274 publication data© 2005 Published in electronic format with permission by the Brazilian Geophysical SocietyPublisher:Society of Exploration Geophysicists HistoryPublished: 14 Sep 2005 CITATION INFORMATION P. Muralikrishna, L.P. Vieira, and M.A. Abdu, (2005), Spectral features of F-region plasma irregularities as observed by rocket- borne electron density probes from Brazil, SEG Global Meeting Abstracts : 2113-2118. https://doi.org/10.1190/sbgf2005-429 Plain-Language Summary Keywordsdensityionosphereplasmahigh frequencyPDF DownloadLoading ..." @default.
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