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Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, Russia
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- PublicationOpen AccessCompatible analysis of vertical and oblique ionospheric sounding data(1996-08)
; ; ; ;Krasheninnikov, I. V.; Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, Russia ;Jodogne, J. C.; Institute Royal Meteorologique, Bruxelles, Belgium ;Alberca, L. F.; Observatory de l'Ebre, Roquetes, Tarragona, Spain; ; Examples are presented of the ray-tracing synthesis of multifrequency Oblique Sounding (OS) data on the Dourbes (Belgium) í Roquetes (Spain) path using electron density height profiles derived from Vertical Sounding (VS) measurements at both terminals. Comparison with the measured OS ionograms provides a means of assessing the accuracy of the VS true-height procedure POLAN. Particular attention was paid to a consideration of the E-F1 valley, that as concluded is often less deep than currently supposed, when derived using both ordinary and extraordinary components of the VS ionograms. Also, it was found that the peak of the F1 -layer should be expressed more distinctly (sometimes with a small valley between the F1 and F2 layers) though the corresponding VS ionograms may have no discontinuity in the region.166 309 - PublicationOpen AccessA comparison of Ne (h) model profiles with ground-based and topside sounder observations(2000-02)
; ; ; ; ;Mikhailov, A. V.; Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, Russia ;Leschinskaya, T. Y.; Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, Russia ;Miro, G.; National Institute of Aerospace Technology, Mazagón (Huelva), Spain ;Depuev, V. K.; Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow Region, Russia; ; ; Monthly median empirical models IRI-95 and NeUoG were compared with incoherent scatter EISCAT and Millstone Hill observations as well as with El Arenosillo Digisonde N e (h) bottomside profiles. A comparison was made for various seasons, levels of solar activity, daytime and night-time hours. The results on the topside comparison: 1) the IRI-95 model systematically and strongly overestimates the Ne (h) effective scale height both for daytime and night-time periods especially during maximum and middle solar activity both at EISCAT and Millstone Hill; 2) the NeUoG model on the contrary systematically underestimates the scale height at all levels of solar activity. But the NeUoG model provides much better overall agreement with SD being less by a factor of 1.5-1.7 in comparison with the IRI-95 model results. The results on the bottom-side comparison: 1) the IRI-95 accuracy is different for daytime and night-time hours, being much worse for the night-time; 2) the NeUoG model similar to IRI-95 demonstrates much worse accuracy for the night-time hours; 3) the NeUoG model demonstrates no advantages over the IRI-95 model in the bottomside N e (h) description. A new simple TopN e model for the N e (h) topside distribution based on the EISCAT and Millstone Hill observations is proposed. The model is supposed to be normalized by the observed hmF 2 and NmF 2 values and is valid below a 600 km height. The TopN e model provides good approximation accuracy over EISCAT and Millstone Hill observations. A comparison with the independent Intercosmos-19 topside sounder observations is given.138 440 - PublicationOpen AccessIrpinia earthquake 23 November 1980 – Lesson from Nature reviled by joint data analysis(2007-02)
; ; ; ; ; ;Pulinets, S. A.; Instituto de Geofísica, Universidad Nacional Autónoma de México, México ;Biagi, P.; Dipartimento Interateneo di Fisica «M. Merlin», Università degli Studi e Politecnico di Bari, Italy ;Tramutoli, V.; Dipartimento di Ingegneria e Fisica dell’Ambiente, Università degli Studi della Basilicata, Italy ;Legenka, A. D.; Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Russian Academy of Science, Russia ;Depuev, V. K.; Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Russian Academy of Science, Russia; ; ; ; A devastating earthquake of magnitude 6.9 occurred in Southern Italy on 23rd November 1980 in Irpinia-Basilicata area. Variations of different geochemical, atmospheric and ionospheric parameters and electromagnetic emissions were registered around the time of the Irpinia earthquake. The substantial progress reached in understanding the physics of the electromagnetic and thermal anomalies associated with the earthquake preparation process permitted us to create the Lithosphere-Atmosphere-Ionosphere (LAI) coupling model published recently. It shows that the observed effects are not independent but present the cause-consequence chain of physical processes and plasma- chemical reactions. We try to analyze the seismic data, radon emanation, hydrological anomalies, ground based ionosondes network, NOAA/AVHRR Thermal Infrared Irradiance (TIR) anomaly, Intercosmos-19 satellite topside sounding and VLF emissions data using the concept of the developed model and existing laboratory and largescale active experiments on air ionization. If the observed radon activity is really connected with the earthquake preparation process, all other variations of the atmosphere and ionosphere parameters can be explained as a consequence of the main physical process – air ionization by radon.720 1935 - PublicationOpen AccessApplication of Autoscala to ionograms recorded by the AIS-Parus ionosonde(2010-05)
; ; ; ;Krasheninnikov, I.; Pushkov InstituteofTerrestrialMagnetism,IonosphereandRadiowavePropagation,Russia ;Pezzopane, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Scotto, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; Autoscala was applied to ionograms recorded by the digital AIS-Parus ionosonde, built at the Pushkov Institute of Terrestrial Magnetism,Ionosphere and Radiowave Propagation, Russia, and installed in Moscow (55.5N,37.5E). Some results in regard to the reliability of the foF2, foF1, and ftEs autoscaled characteristics are presented and discussed. The flexibility of Autoscala is illustrated based on its modular structure.581 529 - PublicationOpen AccessAutoscala: an aid for different ionosondes(2010-06)
; ; ; ; ;Pezzopane, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Scotto, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Tomasik, L. ;Krasheninnikov, I.; ; ;Autoscala is a software to automatically scale ionospheric characteristics from an ionogram. Initially it was only applied to the ionograms recorded by the AIS-INGV ionosondes installed at Rome (41.8N, 12.5E), Gibilmanna (37.9N, 14.0E), Italy, and Tucumán (26.9S, 294.6E), Argentina, that are not able to record the polarization of the received echo. Recently Autoscala was also applied to the ionograms recorded by the AIS-Parus ionosonde installed at Moscow (55.5N, 37.3E), Russia, that is not able to tag the received echo in terms of polarization, and by the VISRC2 ionosonde installed at Warsaw (52.2N, 21.1E), Poland, that is instead able to perform the polarization tagging of the ordinary and extraordinary echoes. This work shows different examples of processing performed on ionograms recorded by all these three different types of ionosondes.372 633