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Bencze, P.
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Bencze, P.
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- PublicationOpen AccessOn the possibilities of coordinated ionospheric soundings and GPS measurements(1994-05)
; ; ; ;Bányai, L.; Geodetic and Geophysical Research Institute, Hungarian Academy of Sciences, Sopron, Hungary ;Kalmár, J.; Geodetic and Geophysical Research Institute, Hungarian Academy of Sciences, Sopron, Hungary ;Bencze, P.; Geodetic and Geophysical Research Institute, Hungarian Academy of Sciences, Sopron, Hungary; ; onospheric soundings carried out at the same site and simultaneously with GPS measurements could contribute to the better understanding of the variations of the total electron content. However, for this purpose the total electron content deduced from GPS measurements must be converted to the place of observation. A method based on an interpolation considered as boundary value problem is recommended for this conversion. Furthermore, the possibilities of the application of datapobtained by ionopheric soundiings in GPS measurements are discussed and also preliminary results of model calculations are presented.122 128 - PublicationRestrictedClimate of the upper atmosphere(2009-08)
; ; ; ; ; ; ; ; ; ; ; ;Bremer, J.; Leibniz-Institute of Atmospheric Physics, Kühlungsborn, Germany ;Lăstovička, J.; Institute of Atmospheric Physics, Academy of Sciences of Czech Republic, Prague, Czech Republic ;Mikhailov, A. V.; Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), ;Altadill, D.; Observatori de l’Ebre, Universitat Ramon Llull – CSIC, Spain ;Bencze, P.; Geodetic and Geophysical Research Institute, Hungarian Academy of Sciences, Sopron, Hungary ;Burešová, D.; Institute of Atmospheric Physics, Academy of Sciences of Czech Republic, Prague, Czech Republic ;De Franceschi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Jacobi, C.; Institute for Meteorology, University of Leipzig, Leipzig, Germany ;Kouris, S.; Electrical and Computer Engineering Department, Aristotle University of Thessaloniki, Greece ;Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Turunen, E.; Sodankylä Geophysical Observatory, Sodankylä, Finland; ; ; ; ; ; ; ; ; ; In the frame of the European COST 296 project (Mitigation of Ionospheric Effects on Radio Systems, MIERS)investigations of the climate of the upper atmosphere have been carried out during the last four years to obtain new information on the upper atmosphere. Mainly its ionospheric part has been analysed as the ionosphere is most essential for the propagation of radio waves. Due to collaboration between different European partners many new results have been derived in the fields of long-term trends of different ionospheric and related atmospheric parameters, the investigations of different types of atmospheric waves and their impact on the ionosphere, the variability of the ionosphere, and the investigation of some space weather effects on the ionosphere.347 39 - 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 AccessBehaviour of the F1-region, and Esand spread-F phenomena at European middle latitudes, particularly under geomagnetic storm conditions(2004)
; ; ; ; ;Bencze, P.; Geodetic and Geophysical Research Institute, Hungarian Academy of Sciences, Sopron, Hungary ;Buresová, D.; Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic ;Lastovicka, J.; Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic ;Märcz, F.; Geodetic and Geophysical Research Institute, Hungarian Academy of Sciences, Sopron, Hungary; ; ; Knowledge of the ionospheric electron density distribution and its fluctuations is essential for predicting ionospheric characteristics for radio wave propagation and for other applications such as satellite tracking, navigation, etc. Geomagnetic storm is the most important source of the ionisation density perturbatio ns. Recent studies of the F1-region electron density distribution revealed systematic seasonal and latitudinal differences in the F1-layer response to geomagnetic storm. At European higher middle latitudes no significant effect has been observed in summer and spring at heights of 160-190 km, whereas well-pronounced depression appears in winter and late autumn at least at 180- 190 km. A brief interpretation of this finding will be presented. On the other hand, the pattern of the response of the ionosphere at F1-layer heights does not seem to depend on the type of response of F2-layer (foF2) or on solar activity. Concerning the main types of ionospheric irregularities sporadic E and spread-F, it has been found that considering sporadic E-layers as thin diffraction screen, it may be modelled for propagation of radio-waves by the determination of the temporal variation of foEs representing in ionograms the mean ion density of «patches» of increased ion density embedded in the Es-layer. Spectrum of these variations indicates the mean period of the variations, which multiplied by the wind velocity gives the mean distance of patches, that is, the mean distance between the screen points. In case of spread-F, it has been found that irregularities causing spread-F are mostly due to plasma instabilities, though the role of travelling ionospheric disturbances may be not entirely neglected.168 1002 - PublicationOpen AccessLong-term trends in the ionosphere and upper atmosphere parameters(2004)
; ; ; ; ; ; ;Bremer, J.; Leibniz-Institute of Atmospheric Physics, Kühlungsborn, Germany ;Alfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bencze, P.; Geodetic and Geophysical Research Institute, Hungarian Academy of Sciences, Sopron, Hungary ;Lastovicka, J.; Institute of Atmospheric Physics, Academy of Sciences of Czech Republic, Prague, Czech Republic ;Mikhailov, A. V.; Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), Russian Academy of Sciences, Troitsk (Moscow Region), Russia ;Rogers, N.; Centre for RF Propagation and Atmospheric Research, QinetiQ, Malvern, U.K.; ; ; ; ; The first part of the paper is directed to the investigation of the practical importance of possible longterm trends in the F2-layer for ionospheric prediction models. Using observations of about 50 different ionosonde stations with more than 30 years data series of foF2 and hmF2, trends have been derived with the solar sunspot number R12 as index of the solar activity. The final result of this trend analysis is that the differences between the trends derived from the data of the individual stations are relatively large, the calculated global mean values of the foF2 and hmF2 trends, however, are relatively small. Therefore, these small global trends can be neglected for practical purposes and must not be considered in ionospheric prediction models. This conclusion is in agreement with the results of other investigations analyzing data of globally distributed stations. As shown with the data of the ionosonde station Tromsø, however, at individual stations the ionospheric trends may be markedly stronger and lead to essential effects in ionospheric radio propagation. The second part of the paper deals with the reasons for possible trends in the Earth’s atmo- and ionosphere as investigated by different methods using characteristic parameters of the ionospheric D-, E-, and F-regions. Mainly in the F2-region different analyses have been carried out. The derived trends are mainly discussed in connection with an increasing greenhouse effect or by long-term changes in geomagnetic activity. In the F1-layer the derived mean global trend in foF1 is in good agreement with model predictions of an increasing greenhouse effect. In the E-region the derived trends in foE and h´E are compared with model results of an atmospheric greenhouse effect, or explained by geomagnetic effects or other anthropogenic disturbances. The trend results in the D-region derived from ionospheric reflection height and absorption measurements in the LF, MF and HF ranges can at least partly be explained by an increasing atmospheric greenhouse effect.245 739