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Miró Amarante, G.
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Miró Amarante, G.
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- PublicationOpen AccessValidation of a method for ionospheric electron density reconstruction by means of vertical incidence data during quiet and storm periods(2005)
; ; ; ; ;Miró Amarante, G.; The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy ;Radicella, S. M.; The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy ;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; ; ; A preliminary validation of the technique developed using the NeQuick ionospheric model and the «effective ionization parameter» Az, based on vertical total electron content data ingestion, was carried out in a previous study. The current study was performed to extend the analyzed conditions and confirm the results. The method to validate this technique is based on a comparison between hourly F2 peak values measured with Vertical Incidence (VI) soundings and those calculated with the new technique. Data corresponding to different hours and seasons (equinox, summer solstice, and winter solstice) during the period 2000-2003 (high and medium solar activity conditions) were compared for all available ionosonde stations. The results show a good agreement between foF2 and hmF2 values obtained with the new technique and measurements from vertical incidence soundings during quiet and storms conditions.247 266 - 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 AccessIonogram inversion F1-layer treatment effect in raytracing(2005)
; ; ; ;Miró Amarante, G.; The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy ;Zhang, M. L.; Laboratory for Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, People s Republic of China ;Radicella, S. M.; The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy; ; This paper shows the importance of the F1-layer shape in the electron density profiles obtained from ionograms with different inversion techniques when the profiles are used in ray tracing. This layer often controls the propagation on the path with ranges less than about 2000 km, particularly for spring and summer periods. Ionograms from two different stations, Hainan (19.4N, 109E) and El Arenosillo (37.1N, -6.7E), obtained during the month of July 2002 (average sunspot number: 99.6) during geomagnetic quiet conditions (Ap-index between 9 and 15) are analyzed. The profiles obtained with two different inversion techniques with different options are used together with the ray tracing program of the Proplab-Pro software. This program calculates the features of the received signal as angle of arrival, path length, height of reflection and range for each given profile assumed to define a spherically symmetric ionosphere in the region along the path. For each ionospheric condition (location, day, hour) the difference between range values obtained with Proplab-Pro program using profiles from the two techniques and the different options (POLAN no valley, POLAN valley, POLAN1-layer and NHPC) are considered.168 356