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Bella, F.
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Bella, F.
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3 results
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- PublicationOpen AccessArtificial and natural electromagnetic signals revealed during two years in the Amare cave (Central Italy)(1994-11)
; ; ; ; ; ; ; ; ;Bella, F.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Bella, R.; IBM - SEMEA, Roma, Italy ;Biagi, P. F.; Dipartimento di Scienze della Terra, Università “La Sapienza”, Roma, Italy ;Caputo, M.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Della Monica, G.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Ermini, A.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Plastino, W.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy ;Sgrigna, V.; Dipartimento di Fisica, Università “La Sapienza”, Roma, Italy; ; ; ; ; ; ; n 1990, some instrumentation was set up in the Amare cave (southern slope of the Gran Sasso chain, L'Aquila) in order to pick up electric signals ranging from 0.3 to 300 kHz, magnetic signals from 0.3 to 30 kHz and seismoacoustic signals by means of three geophones with natural frequencies of 0.3 kHz, 25 kHz and 150 kHz. Data are recorded every ten minutes on a solid state memory. The analysis of the data allows us to establish the existence of electromagnetic fields of distant origin connected with broadcastings and with tropical lightning activity and the discontinuous presence of local electric and magnetic signals, coupled with seismoacoustic ones, connected with weather events. A qualitative explanation of these near fields is given.188 325 - PublicationOpen AccessNormal and anomalous behaviour of electric, magnetic and seismoacoustic signals recorded in the Amare cave(1996-01)
; ; ; ; ; ; ; ;Bella, F.; Dipartimento di Fisica, III Università di Roma, Italy ;Biagi, P. F.; Dipartimento di Fisica, Università di Bari, Italy ;Caputo, M.; Dipartimento di Fisica, Università La Sapienza, Roma, Italy ;Della Monica, G.; Dipartimento di Fisica, III Università di Roma, Italy ;Ermini, A.; Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Università «Tor Vergata», Roma, Italy ;Plastino, W.; Dipartimento di Fisica, III Università di Roma, Italy ;Sgrigna, V.; Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Università «Tor Vergata», Roma, Italy; ; ; ; ; ; Since 1987 multichannel instrumentation has been recording electromagnetic and seismoacoustic emissions in the Amare cave (Gran Sasso í L'Aquila). Equipment detecting RMC (Principality of Monaco) longwave broadcasting (216 kHz) has been operating in the same place. Data collected during this period have pointed out two different phenomena called «quiet» and «perturbed» that characterize the normal behaviour of the cave. On 25 August 1992 an earthquake with M = 3.9 occurred in the Gran Sasso area and on 4 June 1993 an earthquake with M = 4.3 occurred in Umbria, 100 km to north of the Amare cave. Before these earthquakes, electromagnetic, seismoacoustic, and RMC data showed anomalies. Here we present the observed phenomenology and discuss the possibility that the anomalies can be considered precursors of the earthquakes.166 195 - PublicationRestrictedElectromagnetic propagation features of ground-penetrating radars for the exploration of Martian subsurface(2006)
; ; ; ; ; ; ; ; ; ; ; ; ;Pettinelli, E.; Dipartimento di Fisica “E. Amaldi”, Università “Roma Tre”, Roma and INFM-Viterbo, Italy ;Vannaroni, G.; Istituto di Fisica dello Spazio Interplanetario, INAF, Roma, Italy ;Mattei, E.; Dipartimento di Scienze Ambientali, Università della Tuscia, Viterbo and INFM-Viterbo, Italy ;Di Matteo, A.; Dipartimento di Fisica “E. Amaldi”, Università “Roma Tre”, Roma and INFM-Viterbo, Italy ;Paolucci, F.; Dipartimento di Fisica “E. Amaldi”, Università “Roma Tre”, Roma and INFM-Viterbo, Italy ;Pisani, A. R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Cereti, A.; Istituto di Fisica dello Spazio Interplanetario, INAF, Roma, Italy ;Del Vento, D.; Istituto di Fisica dello Spazio Interplanetario, INAF, Roma, Italy ;Burghignoli, P.; Dipartimento di Ingegneria Elettronica, Università “La Sapienza”, Roma, Italy ;Galli, A.; Dipartimento di Ingegneria Elettronica, Università “La Sapienza”, Roma, Italy ;De Santis, A.; Dipartimento di Scienze Ambientali, Università della Tuscia, Viterbo and INFM-Viterbo, Italy ;Bella, F.; Dipartimento di Fisica “E. Amaldi”, Università “Roma Tre”, Roma and INFM-Viterbo, Italy; ; ; ; ; ; ; ; ; ; ; In this work, the effects of magnetic inclusions in a Mars-like soil are considered with reference to the electromagnetic propagation features of ground-penetrating radars (GPRs). Low-frequency and time-domain techniques, using L-C-R meters and TDR instruments, respectively, are implemented in laboratory experimental set-ups in order to evaluate complex permittivity and permeability and wave velocity for different scenarios of a dielectric background medium (silica) with magnetic inclusions (magnetite). Attenuation and maximum detection ranges have also been evaluated by taking into account a realistic GPR environment, which includes the transmitting/receiving antenna performance and the complex structure of the subsurface. The analysis and the interpretation of these results shed new light on the significant influence of magnetic inclusions on the performance of Martian orbiting and rover-driven GPRs.260 33