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Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina
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- PublicationOpen AccessIonospheric response to the 2009 sudden stratospheric warming over the equatorial, low, and middle latitudes in the South American sector(2015)
; ; ; ; ; ; ; ; ; ;Fagundes, P. R.; Universidade do Vale do Paraíba (UNIVAP) ;Goncharenko, L. P.; Massachusetts Institute of Technology ;de Abreu, A. J.; Universidade do Vale do Paraíba (UNIVAP) ;Venkatesh, K.; Universidade do Vale do Paraíba (UNIVAP) ;Pezzopane, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;de Jesus, R.; Universidade do Vale do Paraíba (UNIVAP) ;Gende, M.; Universidad Nacional de La Plata ;Coster, A. J.; Massachusetts Institute of Technology ;Pillat, V. G.; Universidade do Vale do Paraíba (UNIVAP) ;; ; ; ; ; ; ; The present study investigates the ionospheric total electron content (TEC) and F-layer response in the Southern Hemisphere equatorial, low, and middle latitudes due to major sudden stratospheric warming (SSW) event, which took place during January–February 2009 in the Northern Hemisphere. In this study, using 17 ground-based dual frequency GPS stations and two ionosonde stations spanning latitudes from 2.8°N to 53.8°S, longitudes from 36.7°W to 67.8°W over the South American sector, it is observed that the ionosphere was significantly disturbed by the SSW event from the equator to the midlatitudes. During day of year 26 and 27 at 14:00 UT, the TEC was two times larger than that observed during average quiet days. The vertical TEC at all 17 GPS and two ionosonde stations shows significant deviations lasting for several days after the SSWtemperature peak. Using one GPS station located at Rio Grande (53.8°S, 67.8°W, midlatitude South America sector), it is reported for the first time that the midlatitude in the Southern Hemisphere was disturbed by the SSW event in the Northern Hemisphere.419 281 - PublicationOpen AccessA model assisted ionospheric electron density reconstruction method based on vertical TEC data ingestion(2005)
; ; ; ; ; ;Nava, B.; The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy ;Coïsson, P.; The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy ;Miró Amarante, G.; The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy ;Azpilicueta, F.; Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina ;Radicella, S. M.; The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy; ; ; ; A technique to reconstruct the electron density of the ionosphere starting from total electron content values has been developed using the NeQuick ionospheric electron density model driven by its effective ionization parameter Az. The technique is based on the computation of Az values for a suitable worldwide grid of points. A simple way to obtain relevant Az grids is to use global vertical Total Electron Content (TEC) maps to define for each grid point as Az value, the one that minimizes the difference between the experimental and the modeled vertical TEC. Having a global grid of Az values it is possible to compute the electron density at any point in the ionosphere using NeQuick. As a consequence, slant TEC values for specific ground station to satellite links or ionosphere peak parameter values at any location can be calculated. The results of the comparisons between experimental and reconstructed slant TEC as well as experimental and reconstructed peak parameters values indicate that the proposed reconstruction method can be used to reproduce the observed ionosphere in a realistic way.225 264 - PublicationOpen AccessIonospheric biases correction for coordinates derived from GPS single point positioning(2005)
; ; ; ; ; ;Gende, M.; Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina ;Mohíno Harris, E.; Departamento de Geofísica y Meteorología, Universidad Complutense de Madrid, Spain ;Brunini, C.; Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina ;Radicella, S. M.; Aeronomy and Radiopropagation Laboratory, The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy ;Herraiz, M.; Departamento de Geofísica y Meteorología, Universidad Complutense de Madrid, Spain; ; ; ; Most GPS users employ low cost receivers. These receivers do not allow users to record the pseudorange that they observe, but the computed coordinates. This work presents an original and simple method to correct ionospheric biases introduced in GPS signals. The originality of this method is based on the fact that no pseudorange is needed to correct the biases, only the calculated coordinates are used. This distinguishes this method from other classic alternatives. This paper evaluates the efficiency of the method with the use of real data.182 493