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De La Morena, B.
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De La Morena, B.
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- PublicationOpen AccessNear-Earth space plasma modelling and forecasting(2009-08)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Strangeways, H. J.; School of Electronic and Electrical Engineering, University of Leeds, Leeds, UK ;Kutiev, I.; Geophysical Institute, Bulgarian Academy of Sciences (BAS), Sofia, Bulgaria ;Cander, L. R.; Rutherford Appleton Laboratory, Didcot, UK ;Kouris, S.; Electrical and Computer Engineering Department, Aristotle University of Thessaloniki, Greece ;Gherm, V.; Department of Radiophisics, University of St. Petersburg, Russian Federation ;Marin, D.; University of Huelva, Huelva, Spain ;De La Morena, B.; Atmospheric Sounding Station El Arenosillo, INTA, Huelva, Spain ;Pryse, S. E.; Aberystwyth University, Aberystwyth, UK ;Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Pietrella, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Stankov, S.; Royal Meteorological Institute, Brussels, Belgium ;Tomasik, L.; Center for Space Research, Warsaw, Poland ;Tulunay, E.; Middle East Technical University (METU), Ankara, Turkey ;Tulunay, Y.; Middle East Technical University (METU), Ankara, Turkey ;Zernov, N.; Department of Radiophisics, University of St. Petersburg, Russian Federation ;Zolesi, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ; ; ; ; ; ; ; ; ; ; In the frame of the European COST 296 project (Mitigation of Ionospheric Effects on Radio Systems, MIERS)in the Working Package 1.3, new ionospheric models, prediction and forecasting methods and programs as well as ionospheric imaging techniques have been developed. They include (i) topside ionosphere and meso-scale irregularity models, (ii) improved forecasting methods for real time forecasting and for prediction of foF2, M(3000)F2, MUF and TECs, including the use of new techniques such as Neurofuzzy, Nearest Neighbour, Cascade Modelling and Genetic Programming and (iii) improved dynamic high latitude ionosphere models through tomographic imaging and model validation. The success of the prediction algorithms and their improvement over existing methods has been demonstrated by comparing predictions with later real data. The collaboration between different European partners (including interchange of data) has played a significant part in the development and validation of these new prediction and forecasting methods, programs and algorithms which can be applied to a variety of practical applications leading to improved mitigation of ionosphereic and space weather effects.302 150 - PublicationOpen AccessA comparison of f0F hmE model calculations with El Arenosillo digisonde observations. Seasonal variations(1999-08)
; ; ; ; ;Mikhailov, A. V.; Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, Russia ;de la Morena, B. A.; National Institute of Aerospace Technology, Mazagón (Huelva), Spain ;Miro, G.; National Institute of Aerospace Technology, Mazagón (Huelva), Spain ;Marin, D.; National Institute of Aerospace Technology, Mazagón (Huelva), Spain; ; ; Seasonal variations of hmE and f0F2 are analyzed using El Arenosillo digisonde observations during solar minimum (1995-1996). Unlike some widely used empirical models daytime hmE show seasonal variations with winter hmE being higher than summer ones and seasonal differences increase with solar zenith angle. Model calculations enable us to reproduce the observed hmE seasonal variations but the calculated daytime f0E values are too low if conventional EUV fluxes and dissociative recombination rate constants are used. A reduction of a (NO+ ) by taking into account Te > Tn in the E-region as it follows from probe measurements seems to be a plausible solution. The E-region ion composition corresponding to rocket observations may be obtained in model calculations using an appropriate [NO] height distribution. Calculated summer concentrations of [NO] are by a factor of 3-4 larger than winter ones at the hmE-heights.129 257 - PublicationOpen AccessCorrelation in f0F2 and M(3000) F2 variations in South-West Europe(1996-08)
; ; ; ; ; ;de la Morena, B. A.; Atmospheric Sounding Station, INTA/CEDEA, Mazagòn, Huelva, Spain ;Alberca, L. F.; Ebro Observatory, Roquetes, Tarragona, Spain ;Sole, J. G.; Ebro Observatory, Roquetes, Tarragona, Spain ;Vilaplana, J. M.; Associate Collaborator, Atmospheric Sounding Station, INTA/CEDEA, Mazagon, Huelva, Spain ;Kazimirovsky, E. S.; nstitute of Solar-Terrestrial Physics, Academy of Sciences, Irkutsk, Russia; ; ; ; A statistical analysis of the variations of the hourly daily values of the M(3000)F2 with the corresponding values of critical frequencies f0F2 was provided for two similar ionosondes (Digisonde-256) located in El Arenosillo and Geophysical Observatory Ebro (both in Spain). Data for winter 1993/1994 and summer 1993 are presented. It is shown that for hour-to-hour variations (both seasons) and for day-to-day variations in summer the correlation is poor and contradictory but for the day-to-day variations in winter months the correlation is significantly higher and positive.179 113 - PublicationRestrictedThe contribution to IHY from the COST296 Action MIERS: Mitigation of Ionospheric Effects on Radio Systems(2009-04)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;De Franceschi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Alfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Altadill, D.; Observatorio del Ebro, Tortosa, Spain ;Bencze, P.; Hungarian Academy of Sciences, Geodetic and Geophysical Research Institute, Sopron, Hungary ;Bourdillon, A.; Institut d'Electronique et de Télécommunications de Rennes, Rennes, France ;Buresova, D.; Institute of Atmospheric Physics, Prague, Czech Republic ;Cander, L. R.; Rutherford Appleton Laboratory, Council for the Central Laboratory of the Research Councils, Oxfordshire, UK ;de la Morena, B.; Instituto Nacional de Tecnica Aerospacial, Torrejon de Ardoz, Spain ;Economou, L.; Intercollege Limassol Campus, Limassol, Cyprus ;Herraiz, M.; Universidad Complutense Madrid, Madrid, Spain ;Kauristie, K.; Finnish Meteorological Institute, Helsinki, Finland ;Lastovicka, J.; Institute of Atmospheric Physics, Prague, Czech Republic ;Pau, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Rodriguez, G.; Universidad Complutense Madrid, Madrid, Spain ;Stamper, R.; Rutherford Appleton Laboratory, Council for the Central Laboratory of the Research Councils, Oxfordshire, UK ;Stanislawska, I.; Space Research Center- Polish Academy of Science, Warsaw, Poland; ; ; ; ; ; ; ; ; ; ; ; ; ; ; The objective of the COST296 Action MIERS (Mitigation of Ionospheric Effects on Radio Systems) is to develop an increased knowledge of the effects imposed by the ionosphere on practical radio systems, and for the development and implementation of techniques to mitigate the deleterious effects of the ionosphere on such systems (http://www.cost296.rl.ac.uk). The COST296 Community contributes to the international efforts of IHY with scientific and outreach activities as well. After the realization of a web site hosted by Istituto Nazionale di Geofisica e Vulcanologia (INGV), developed also to promote the ionospheric physics to the open public, the COST296 Community supported an initiative addressed to the pupils of the primary school of several European Countries: the realization of a school-calendar dedicated to the Sun and to the Sun-Earth connections.352 28 - PublicationOpen AccessWorst cases for an one-hop high frequency link(2002)
; ; ; ; ;Mirò, G.; Atmospheric Sounding Station «El Arenosillo», National Institute of Aerospace Technology, Magazón, Huelva, Spain ;de la Morena, B. A.; Atmospheric Sounding Station «El Arenosillo», National Institute of Aerospace Technology, Magazón, Huelva, Spain ;Radicella, S. M.; Aeronomy and Radiopropagation Laboratory, Abdus Salam ICTP, Trieste, Italy ;Herraiz, M.; Department of Geophysics and Meteorology, Faculty of Physics, Complutense University, Madrid, Spain; ; ; The characterisation of a HF channel by means of monthly electron density profiles can be complemented with a detailed study of radio propagation «worst cases» on situations with extremes conditions of radiopropagation for a given period. These «worst cases» correspond to conditions that can be identified by means of cumulative distributions of the key parameter f0F2. In this paper, the main parameters of the HF channel: time delay, apogee, elevation angle and transmission frequency with mean and extreme conditions are analysed. The method used to characterise the ionospheric channel is based on ray-tracing techniques.131 168 - PublicationOpen AccessA method for f0F2 monitoring over Spain using the El Arenosillo digisonde current observations(1999-08)
; ; ; ; ;Mikhailov, A. V.; Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, Russia ;de la Morena, B. A.; National Institute of Aerospace Technology, Mazagón (Huelva), Spain ;Miro, G.; National Institute of Aerospace Technology, Mazagón (Huelva), Spain ;Marin, D.; National Institute of Aerospace Technology, Mazagón (Huelva), Spain; ; ; Ionosphere monitoring implies: observations, prediction and mapping of ionospheric parameters. A case with one available (El Arenosillo) ionosonde is considered. Some statistical methods for f0F2 short-term (1-24 h in advance) prediction are compared. The analysis of multi-dimensional regression for Df0F2 (relative deviation from running median) with Ap, F10.7 and previous Df0F2 observations has shown that inclusion of additional terms with Ap and F10.7 improves the prediction accuracy for lead time more than 15 h. For lead time 1-6 h a linear regression with earlier observed Df0F2 provides the f0F2 forecast with Relative Mean Deviation (RMD) 6-11%. This is acceptable from a practical point of view. A 24-h forecast can be done with RMD 10-11%. Multi-regressional methods provide better prediction accuracy than the usual 10-day running median or quasi-inertial method based on such median. Hourly f0F2 values may be used to calculate the effective index R12eff used as input to the ITU-R monthly median model. This allows the ITU-R model to "breathe" following hour-to-hour f0F2 variations. Then standard surfering methods may be applied for f0F2 mapping over the whole area. The f0F2 mapping accuracy based on the hourly R12eff index is shown to be 9-11% depending on solar activity level.174 224