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• W2334808503 abstract "Observations of terrestrial ionosphere using Wavelet Transforms on data from GPS receivers with dual frequency ionospheric held in Manaus. Were also included in the study, the indices Kp and Dst for comparison purposes. The results showed that when solar flares occur, the Wavelet Transform can better characterize the phenomenon, allowing better visible frequency, duration and intensity, and there is also a direct influence on the data collected by GPS. Introduction This study analyzes data from total electronic content (TEC), during the period of geomagnetic storms recorded by the Kyoto WDC (World Data Center for geomagnetism, Kyoto Dst index), GFZ POTZDAM (Deutsches Zentrum Geo Forschungs Kp index) and Manaus station (TEC) (Figure 1), being part of the sensor network of low latitude ionospheric Lutheran University Center of Manaus (CEULM ULBRA) and the University of Vale do Paraiba (UNIVAP) that the LISN (Low-Latitude Ionospheric Sensor Network) ionospheric monitoring. In the study by Lima (2009) on the equatorial ionosphere in Central Amazonia, shows that it is of great relevance these observations because of this mosaic in South America, is the region of the globe increased formation of RayleighTaylor instability ( gradient drift Plasma or bubbles) and strong variations in the TEC (temporal-spatial), compared to other regions of the Earth. It is also used in the technique of wavelet transform in Dst values, which proved ideal tool for the analysis of no stationary signals due to its ability to compress or expand depending on the scale of analysis (Farge 1992; Daubechies 1992; Bolzan and Vieira 2006). Figure 1: Location of ionospheric station on the campus of CEULM / ULBRA in Manaus (2.9 0 S, 60.0 0 W, dip latitude 6.4 N). The sensor network ionospheric low latitude LISN, of which UNIVAP and CEULM-ULBRA part, possesses 70 GPS receivers and 5 ionosondes capable of measuring the TEC in F layer and 5 magnetometers that are positioned along the same meridian magnetic extending from the crest north to the southern crest of the equatorial anomaly, described by Cardoso et al. 2010 and Pillat 2006. Method The TEC is defined by the integral (Eq. 1) of the electron density along the path of the signal between the satellite S and the receiver R, in cylindrical column with crosssection area of 1m 2 (Monico 2000; Kaplan and Hegarty 2006). TEC = ∫ neds s r (1) The parameter of ionospheric total electron content is presented in TEC units (TECU), where a 1 TECU corresponds to 10 electrons / m2. The main reason the TEC parameter is intensively studied is the fact that interfere directly in the calculation of positioning via GPS. There is great interest in studying the TEC in the" @default.
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• W2334808503 date "2013-01-09" @default.
• W2334808503 modified "2023-09-24" @default.
• W2334808503 title "Observations of TEC and Dst values using wavelet transform in F2 layer near the equatorial region in August 2011" @default.
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• W2334808503 doi "https://doi.org/10.1190/sbgf2013-057" @default.
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