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Piancatelli, Andrea
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- PublicationOpen AccessUltra low frequency geomagnetic field measurements during earthquake activity in Italy (September-October 1997)(2001-04)
; ; ; ;Villante, U.; Dipartimento di Fisica, Università ed Area di Astrogeofisica, L'Aquila, Italy ;Vellante, M.; ipartimento di Fisica, Università ed Area di Astrogeofisica, L'Aquila, Italy ;Piancatelli, A.; ipartimento di Fisica, Università ed Area di Astrogeofisica, L'Aquila, Italy; ; Different methods with different results have been proposed in the scientific literature to identify the possible occurrence of weak seismo-magnetic ULF emissions. In September-October, 1997 Central Italy was struck by repeated seismic activity (M L < 5.8). A simple amplitude analysis of the geomagnetic field variations (horizontal components, in the frequency range 4-100 mHz) at a geomagnetic facility located 65-85 km from epicenters of major earthquakes does not reveal in this case any clear evidence for possible ULF emissions.172 286 - PublicationOpen AccessGeomagnetic field observations at a new Antarctic site, within the AIMNet project(2010-05-02)
; ; ; ; ; ; ; ; ; ;Lepidi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Cafarella, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Santarelli, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Pietrolungo, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Urbini, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Piancatelli, A.; Universita’ di L’Aquila, L’Aquila, Italy., (3) British Antarctic Survey, Cambridge, UK ;Biasini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Di Persio, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Rose, M.; British Antarctic Survey, Cambridge, UK; ; ; ; ; ; ; ; During the 2007-2008 antarctic campaign, the Italian PNRA installed a Low Power Magnetometer within the framework of the AIMNet (Antarctic International Magnetometer Network) project, proposed and coordinated by BAS. The magnetometer is situated at Talos Dome, around 300 km geographically North-West from Mario Zucchelli Station (MZS), and approximately at the same geomagnetic latitude as MZS. In this work we present a preliminary analysis of the geomagnetic field 1-min data, and a comparison with simultaneous data from different Antarctic stations.261 361 - PublicationOpen AccessPc3 pulsations in the polar cap and at low latitude(2010)
; ; ; ; ; ; ; ; ;We present a statistical analysis of Pc3–4 pulsations during 2005 at two polar cap stations (Terra Nova Bay and Dome C, Antarctica) and, for comparison, at a low‐latitude station (L’Aquila). The analysis technique allows to discriminate the signal component from the background noise in the power spectrum and to determine the frequency of such ULF signal, commonly associated to the upstream wave source. The comparison of data makes evident that the characteristics of the ULF pulsations are different at low and high latitudes, and significant differences emerge also between the two polar cap stations. At Dome C the ULF signals are observed during the whole day, while at Terra Nova Bay and at L’Aquila the signals are mainly observed in the dayside sector. The different cone angle dependence at L’Aquila and Dome C, the steeper slope in the frequency dependence on the interplanetary magnetic field strength at Dome C with respect to L’Aquila and Terra Nova Bay and the time dependence of the coherence between pulsations at the Antarctic stations suggest that at low‐latitude waves are transmitted to the ground from a region close to the subsolar bow shock, while near the geomagnetic pole waves are mainly transmitted through the magnetotail lobes. At Terra Nova Bay, where the local field lines approach the cusp around noon and are stretched into the magnetotail around midnight, the transmission path seems to be time dependent, with daytime and nighttime pulsations penetrating through the subsolar point and via the magnetotail lobes, respectively.127 28 - PublicationOpen AccessThe 6 April 2009 earthquake at L’Aquila: a preliminary analysis of magnetic field measurements(2010-02-09)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Villante, U.; Dipartimento di Fisica, Universit`a L’Aquila, L’Aquila, Italy ;De Lauretis, M.; Dipartimento di Fisica, Universit`a L’Aquila, L’Aquila, Italy ;De Paulis, C.; Dipartimento di Fisica, Universit`a L’Aquila, L’Aquila, Italy ;Francia, P.; Dipartimento di Fisica, Universit`a L’Aquila, L’Aquila, Italy ;Piancatelli, A.; Dipartimento di Fisica, Universit`a L’Aquila, L’Aquila, Italy ;Piancatelli, A.; Dipartimento di Fisica, Universit`a L’Aquila, L’Aquila, Italy ;Pietropaolo, E.; Dipartimento di Fisica, Universit`a L’Aquila, L’Aquila, Italy ;Vellante, M.; Dipartimento di Fisica, Universit`a L’Aquila, L’Aquila, Italy ;Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Palangio, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Schwingenschuh, K.; Institut f¨ur Weltraumforschung, Graz, Austria ;Prattes, G.; Institut f¨ur Weltraumforschung, Graz, Austria ;Magnes, W.; Institut f¨ur Weltraumforschung, Graz, Austria ;Nenovski, P.; Geophysical Institute, Sofia, Bulgaria; ; ; ; ; ; ; ; ; ; ; ; ;Several investigations reported the possible identification of anomalous geomagnetic field signals prior to earthquake occurrence. In the ULF frequency range, candidates for precursory signatures have been proposed in the increase in the noise background and polarization parameter (i.e. the ratio between the amplitude/power of the vertical component and that one of the horizontal component), in the changing characteristics of the slope of the power spectrum and fractal dimension, in the possible occurrence of short duration pulses. We conducted, with conventional techniques of data processing, a preliminary analysis of the magnetic field observations performed at L’Aquila during three months preceding the 6 April 2009 earthquake, focusing attention on the possible occurrence of features similar to those identified in previous events. Within the limits of this analysis, we do not find compelling evidence for any of the features which have been proposed as earthquake precursors: indeed, most of aspects of our observations (which, in some cases, appear consistent with previous findings) might be interpreted in terms of the general magnetospheric conditions and/or of different sources.600 9736 - PublicationRestrictedSome aspects of man-made contamination on ULF measurements(2004)
; ; ; ; ; ; ; ; ;Villante, U.; Dipartimento di Fisica, Università, L’Aquila, Italy - Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Vellante, M.; Dipartimento di Fisica, Università, L’Aquila, Italy - Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Piancatelli, A.; Dipartimento di Fisica, Università, L’Aquila, Italy - Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Di Cienzo, A.; Consorzio Area di Ricerca in Astrogeofisica, L’Aquila, Italy ;Zhang, T. L.; Institut für Weltraumforschung, Graz, Austria ;Magnes, W.; Institut für Weltraumforschung, Graz, Austria ;Wesztergom, V.; Geodetic and Geophysical Research Institute of the Hungarian Academy of Science, Sopron, Hungary ;Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ;; An analysis of the man made contamination on ULF measurements in highly populated areas has been conducted at several suitably chosen sites in Western Europe. The experimental results show common characteristics at different stations with clear evidence for an additional working day contamination with respect to weekends. These effects more clearly emerge in the vertical component that is less influenced by natural signals. A similar analysis conducted at Terra Nova Bay does not reveal any clear evidence for man made disturbances on Antarctic measurements.240 80 - PublicationOpen AccessA study of geomagnetic field variations along the 80° S geomagnetic parallel(2017)
; ; ; ; ; ; ; ; ; ; ;; ; The availability of measurements of the geomagnetic field variations in Antarctica at three sites along the 80° S geomagnetic parallel, separated by approximately 1 h in magnetic local time, allows us to study the longitudinal dependence of the observed variations. In particular, using 1 min data from Mario Zucchelli Station, Scott Base and Talos Dome, a temporary installation during 2007–2008 Antarctic campaign, we investigated the diurnal variation and the low-frequency fluctuations (approximately in the Pc5 range, 1–7 mHz). We found that the daily variation is clearly ordered by local time, suggesting a predominant effect of the polar extension of midlatitude ionospheric currents. On the other hand, the pulsation power is dependent on magnetic local time maximizing around magnetic local noon, when the stations are closer to the polar cusp, while the highest coherence between pairs of stations is observed in the magnetic local nighttime sector. The wave propagation direction observed during selected events, one around local magnetic noon and the other around local magnetic midnight, is consistent with a solar-wind-driven source in the daytime and with substorm-associated processes in the nighttime.457 21 - PublicationOpen AccessThe geomagnetic coast effect at two 80° S stations in Antarctica, observed in the ULF rangeWe examined the coast effect in Antarctica along the 80 S magnetic parallel. We used the geomagnetic field measurements at the two coastal stations of Mario Zucchelli Station and Scott Base, and, as a reference, at the inland temporary station Talos Dome, during 18 January– 14 March 2008. Spectral analysis in the Pc5 frequency range (1–7 mHz) revealed large differences between coastal and inland stations, such as higher spectral power levels in the vertical component and higher coherence between horizontal and vertical components at coastal stations. Using the interstation method on selected active time intervals, with Talos Dome as a remote reference station, we found that remote reference induction arrows are directed almost perpendicularly with respect to their respective coastlines. Moreover, the singlestation analysis shows that at Talos Dome the amplitude of the induction arrows is much smaller than at coastal stations. These results clearly indicate that coast effect at a few hundred kilometers from the coastline is relatively small. The coast effect on polarization parameters was examined, for a Pc5 event that occurred on 11 March 2008. The results evidenced that the azimuthal angle of polarized signals at one of the coastal stations is largely different with respect to the inland station (by 110 ), while the polarization ratio and ellipticity attain comparable values. We proposed a correction method of the polarization parameters, which operates directly in the frequency domain, obtaining comparable azimuthal angles at coastal and inland stations.
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