http://hdl.handle.net/2122/101 Ricerca nel canale cerca http://www.earth-prints.org/simple-search http://hdl.handle.net/2122/6043 Titolo: Ionospheric transients observed at mid-latitudes prior to earthquake activity in Central Italy<br/><br/>Autori: Nenovski, P.; Geophysical Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; Spassov, Ch.; Geophysical Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; Pezzopane, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Villante, U.; Dipartimento di Fisica, Università dell’Aquila, L’Aquila, Italy; Vellante, M.; Dipartimento di Fisica, Università dell’Aquila, L’Aquila, Italy; Serafimova, M.; Geophysical Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria<br/><br/>Abstract: Ionograms from Rome (41.8N, 12.5E) and Sofia(42.4N, 23.2E) ionospheric stations during earthquake(EQ)activity with magnitude(M)between 5 and 6 in Central Italyare analyzed. It is found that several ionospheric disturbances occur in the intermediate E-F region before the EQshock. In fact, besides sporadic E (Es) layer development(of type h) of short duration (transients), fmin increase, tracegaps near the critical frequencies, and E region trace disappearance are also observed within one to three hours before the EQ shock. Before the EQ shocks we find that the F2 region parameters are practically undisturbed. The only exception is the so-called fork trace that appears mostly near the critical frequency of the F2 region. Acoustic gravity waves (AGW) are suggested as one of the possible sources of transients observed in the ionosphere before the EQ shock. http://hdl.handle.net/2122/6012 Titolo: Satellite traces, range spread-F occurrence, and gravity wave propagation at the southern anomaly crest<br/><br/>Autori: Cabrera, M. A.; Pezzopane, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Zuccheretti, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Ezquer, R. G.<br/><br/>Abstract: Range spread-F (RSF) and occurrence of “satellite” traces prior to RSF onset were studied at the southern peak of the ionospheric equatorial anomaly (EA). Ionograms recorded in September 2007 at the new ionospheric station of Tucumán, Argentina (26.9° S, 294.6° E, dip latitude 15.5° S), by the Advanced Ionospheric Sounder (AIS) developed at the Istituto Nazionale di Geofisica e Vulcanologia INGV), were considered.Satellite traces (STs) are confirmed to be a necessary precursor to the appearance of an RSF trace on the ionograms.Moreover, an analysis of isoheight contours of electron density seems to suggest a relationship between RSF occurrenceand gravity wave (GW) propagation. http://hdl.handle.net/2122/5999 Titolo: La gestione dei dati meteo della stazione sismica marina multi-parametrica CFSB<br/><br/>Autori: Guardato, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Vassallo, M.; AMRA - Analisi e Monitoraggio dei Rischi Ambientali, Napoli http://hdl.handle.net/2122/5994 Titolo: Autoscala: an aid for different ionosondes<br/><br/>Autori: 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.<br/><br/>Abstract: 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. http://hdl.handle.net/2122/5984 Titolo: Application of Autoscala to ionograms recorded by the AIS-Parus ionosonde<br/><br/>Autori: 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<br/><br/>Abstract: 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 inMoscow (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. http://hdl.handle.net/2122/5968 Titolo: Application of Autoscala to ionograms recorded by the VIPIR ionosonde<br/><br/>Autori: Bullett, T.; Malagnini, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Pezzopane, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Scotto, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia<br/><br/>Abstract: In November 2008, the ionosonde station at Boulder, Colorado, USA (40.0°N; 105.3°W) became the host of a new ionosonde(VIPIR, Vertical Incidence Pulsed Ionospheric Radar) developed and built by Scion Associates.The VIPIR is a fully digital frequency agile radar that operates between 0.3 and 26 MHz. It features 8 digital receivers and a digitaltransmit exciter. Extremely high performance analog receive electronics and a 4 kW solid state amplifier provide interface to the realworld.This work describes the application of Autoscala to the ionograms recorded by this ionosonde. First results, in terms of ionograms and autoscaled characteristics, are presented and discussed. http://hdl.handle.net/2122/5334 Titolo: Near Earth space plasma monitoring under COST 296<br/><br/>Autori: Altadill, D.; Observatori de l’Ebre, Universitat Ramon Llull – CSIC, Spain; Boska, J.; Institute of Atmospheric Physics, ASCR, Czech Republic; Cander, L. R.; STFC, Rutherford Appleton Laboratory, Chilton, UK; Tamara Gulyaeva, T.; IZMIRAN , Troitsk, Moscow Region, Russia; Reinisch, B. W.; Center for Atmospheric Research, UMass Lowell, USA; Romano, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Krankowski, A.; University of Warmia and Mazury, Poland; Bremer, J.; Leibnitz-Institute of Atmospheric Physics, Kühlungsborn, Germany; Belehaki, A.; National Observatory of Athens, Athens, Greece; Stanislawska, I.; Space Research Centre PAS, Warsaw, Poland; Jakowski, N.; DLR, Institute of Communications and Navigation, Neustrelitz, Germany; Scotto, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia<br/><br/>Abstract: This review paper presents the main achievements of the near Earth space plasma monitoring under COST 296 Action. The outputs of the COST 296 community making data, historical and real-time, standardized and available to the ionospheric community for their research, applications and modeling purposes are presented. The contribution of COST 296 with the added value of the validated data made possible a trusted ionospheric monitoring for research and modeling purposes, and it served for testing and improving the algorithms producing real-time data and providing data users measurement uncertainties. These value added data also served for calibration andvalidation of space-borne sensors. New techniques and parameters have been developed for monitoring the near Earth space plasma, as time dependent 2D maps of vertical total electron content (vTEC), other key ionospheric parameters and activity indices for distinguishing disturbed ionospheric conditions, as well as a technique for improving the discrepancies of different mapping services. The dissemination of the above products has been developed by COST 296 participants throughout the websites making them available on-line for real-time applications. http://hdl.handle.net/2122/5297 Titolo: An example of operation for a partly manned Antarctic geomagnetic observatory and the development of a radio link for data transmission<br/><br/>Autori: Torta, J. M.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain; Marsal, S.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain; Riddick, J. C.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain; Vilella, C.; Enginyeria i Arquitectura La Salle, Universitat Ramon Llull, Barcelona, Spain; Altadill, D.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain; Blanch, E.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain; Cid, O.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain; Curto, J. J.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain; De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Gaya-Piqué, L. R.; Equipe de Géomagnétisme, Institut de Physique du Globe de Paris-CNRS, Paris, France; Mauricio, J.; Enginyeria i Arquitectura La Salle, Universitat Ramon Llull, Barcelona, Spain; Pijoan, J. L.; Enginyeria i Arquitectura La Salle, Universitat Ramon Llull, Barcelona, Spain; Solé, J. G.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain; Ugalde, A.; Observatori de l’Ebre, CSIC - Universitat Ramon Llull, Roquetes, Spain<br/><br/>Abstract: The experience acquired from more than ten years of operation of an Antarctic geomagnetic observatory is described along with the development of data transmission facilities. The observatory was deployed at the Spanish Antarctic Station in 1996. The main instrument was an Overhausermagnetometer deployed in dual axis Helmholtz coils, a δD/δI configuration.The site is only manned during the summer, with the magnetometer left recording throughout the rest of the year. During the 2007-2008 survey the observatory instrumentation has been upgraded with a DMI suspended triaxial fluxgate magnetometer, new sampling hardware and data logging software. Both sampling and timing are carried out under the control of a PIC basedmicrocontroller and GPS receiver. Data presentation, transmission andarchiving are performed under the control of a low power embedded PC. For real time access to the data two options have been provided and rigorously tested during the last 10 years: METEOSAT and GOES Data Collection Systems, and recently, a high frequency (HF) digital radio-link, using ionospheric propagation between Antarctica and Spain, has been developed. This latesttransmission system is being continuously upgraded, and it would be possibleto extend its application to other remote stations. Measurements have been made during the last four years in order to determine the channel characteristics and its variability, mainly the multipath and Doppler spread and the link availability for a given SNR in the receiver. Thesemeasurements are being used to design the physical layer of a radiomodemintended to maximize the link capacity keeping the emitted power low. http://hdl.handle.net/2122/5193 Titolo: Electron density profile calculation technique for Autoscala ionogram analysis<br/><br/>Autori: Scotto, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia<br/><br/>Abstract: An electron density profile model with free parameters is introduced. Initially the parameters are calculated on the basis of the ionospheric characteristics automatically obtained from the ionograms by Autoscala and considering the helio-geophysical conditions. The technique used to adjust the free parameters to the particular ionograms recorded is presented. http://hdl.handle.net/2122/5119 Titolo: Geomagnetism and Aeronomy activities in Italy during IGY, 1957/58<br/><br/>Autori: Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Alfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia<br/><br/>Abstract: In 2007 several events were organized to celebrate the fiftieth anniversary of the International Geophysical Year(IGY, 1957-1958). The celebrations will last until 2009 and are taking place within different contexts: the InternationalPolar Year (IPY), the International Heliophysical Year (IHY), the electronic Geophysical Year (eGY) and the International Year of Planet Earth (IYPE).IGY offered a very appropriate and timely occasion to undertake a series of coordinated observations of variousgeophysical phenomena all over the globe. Italy took part in the broad international effort stimulated by IGY. In fact, Italy participated in observations and studies in many of the proposed scientific areas, in particular Geomagnetism and Aeronomy. The Istituto Nazionale di Geofisica (ING) started the installation of observatories,and updated and ensured continuous recording of geophysical observations. Geomagnetism, ionospheric physics, seismology, and other geophysical disciplines, were advanced. Although much of the work was undertakenin Italy, some attention was also devoted to other areas of the world, in particular Antarctica, where Italy participated in seismological observations. This paper gives a summary of the Geomagnetism and IonosphericPhysics activities within IGY. Furthermore, we highlight the importance of this historical event and its outcomesfor the improvement of geophysical observations and the post-IGY growth of scientific investigations in Italy.