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Stankov, S.
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Stankov, S.
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- PublicationOpen AccessA steady-state F-region model and its use for satellite data analysis(1996-10)
; ;Stankov, S. M.; Geophysical Institute, Bulgarian Academy of Sciences, Sofia, BulgariaA steady-state mathematical model of the Earth's upper ionosphere and plasmasphere is presented. In the model the equations of continuity, momentum, and energy balance for O+, H+, and He+ ions are solved numerically along dipole magnetic field lines. As an extension of the model, a searching method is developed for de- termination of the boundary values in a self-consistent manner. Model results are compared with Atmosphere Explorer satellite measurements.135 125 - PublicationOpen AccessIonosphere-plasmasphere response to geomagnetic storms studied with the RMI-Dourbes comprehensive database(2002)
; ; ;Jodogne, J. C.; Royal Meteorological Institute of Belgium,Brussels,Belgium ;Stankov, S. M.; Royal Meteorological Institute of Belgium,Brussels,Belgium; Presented is a review of the ionospheric storm research carried out at the Royal Meteorological Institute (RMI)of Belgium.The studies are based on the opportunities offered by the long-term measurements and the accumulated comprehensive database managed by the RMI Geophysics Centre at Dourbes (4.6 °E,50.1 °N).Reported are case studies of major storms,and also results in developing forecasting and density reconstruction methods.239 391 - PublicationOpen AccessModelling the light-ion densities in the ionosphere(1996-12)
; ;Stankov, S. M.; Geophysical Institute, Bulgarian Academy of Sciences, Sofia, BulgariaA steady-state theoretical model is used to obtain variations of the H+/O+ and He+/O+ density ratios in the upper ionosphere at middle latitudes. The model results are compared with the existing data from satellite measurements. Analytical functions are constructed approximating the latitude and altitude variations of these ratios.260 109 - 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 AccessReview of progress in gathering, distributing and using satellite data for activities within COST 238 (PRIME)(1996-08)
; ; ;Kutiev, I.; Geophysical Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria ;Stankov, S.; Geophysical Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria; Recent progress in using the satellite data for various PRIME purposes is briefly presented. The satellite data base is already in operation and contains data of local plasma and neutral atmosphere parameters taken from several ionospheric satellites. A method of tracing the locally measured parameters along the magnetic field lines down to hmF2 is developed using a theoretical F-region code. This method is applied to receive f0F2sat needed to test monthly median and instantaneous mapping methods. In order to reduce the uncertainties arising from the unknown photoionization and recombination rates, f0F2 is calibrated at one point on the satellite orbit with a Vertical Incident (VI) f0F2 and their ratio is then assumed constant along the whole satellite track over the PRIME area. The testing procedure for monthly median maps traces the measured plasma density down to a basic height of 400 km, where individual f0F2sat values are accumulated in every time/subarea bin within the given month, then their median is calibrated with the available medians from the VI ionosonde network. From all available satellite orbits over the PRIME area, 35 of them were found to pass over two VI ionosonde stations. The second station in these orbits was used to check the calculated f0F2sat with the measured VI f0F2. The standard deviation was found to be only 0.15 MHz.153 98 - PublicationOpen AccessNowcasting, forecasting and warning for ionospheric propagation: tools and methods(2004)
; ; ; ; ; ; ; ; ; ; ; ;Stamper, R.; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, U.K. ;Belehaki, A.; National Observatory of Athens, Institute for Space Applications and Remote Sensing, P. Penteli, Greece ;Buresová, D.; Institute of Atmospheric Physics, Academy of Science of Czech Republic, Prague, Czech Republic ;Cander, L. R.; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, U.K. ;Kutiev, I.; Bulgarian Academy of Sciences, Sofia, Bulgaria ;Pietrella, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Stanislawska, I.; Space Research Centre, Warsaw, Poland ;Stankov, S.; Deutsches Zentrum für Luft und Raumfahrt (DLR), Institut für Kommunikation und Navigation (IKN), Neustrelitz, Germany ;Tsagouri, I.; National Observatory of Athens, Institute for Space Applications and Remote Sensing, P. Penteli, Greece ;Tulunay, Y. K.; Istanbul Technical University, Istanbul, Turkey ;Zolesi, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ; ; ; ; ; The paper reviews the work done in the course of the COST 271 Action concerned with the development of tools and methods for forecasting, nowcasting and warning of ionospheric propagation conditions. Three broad categories of work are covered. First, the maintenance and enhancement of existing operational services that provide forecast or nowcast data products to end users; brief descriptions of RWC Warsaw and the STIF service are given. Second, the development of prototype or experimental services; descriptions are given of a multi-datasource system for reconstruction of electron density profiles, and a new technique using real-time IMF data to forecast ionospheric storms. The third category is the most wide-ranging, and deals with work that has presented new or improved tools or methods that future operational forecasting or nowcasting system will rely on. This work covers two areas - methods for updating models with prompt data, and improvements in modelling or our understanding of various ionospheric-magnetospheric features - and ranges over updating models of ionospheric characteristics and electron density, modelling geomagnetic storms, describing the spatial evolution of the mid-latitude trough, and validating a recently-proposed technique for deriving TEC from ionosonde observations.241 1113