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Dominici, Guido
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Dominici, Guido
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guido.dominici@ingv.it
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51 results
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- PublicationOpen AccessInfluence of solar activity on magnetic network measurements(2012)
; ; ; ; ;Tozzi, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Dominici, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;De Michelis, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; The influence of solar activity on magnetic measurements taken during the Italian repeat station surveys performed in 1999/2000 and 2009/2010 has been investigated. A method to estimate the difference between the 2000.0 and 2010.0 surveys in terms of the “residual” (i.e. not completely reduced) external contribution is proposed. This method is also based on the removal of the contribution due to the magnetic field of internal origin by means of CHAOS3 model from magnetic repeat station measurements. The origin of the observed differences is interpreted in terms of the very different level of solar activity between 2000.0 and 2010.0. Indeed, results seem to suggest that differences could be attributed to the enhanced ring current intensity during a phase of solar maximum. The investigation of the spatial patterns of these differences suggests that they could be reduced by introducing a larger number of variometer stations, especially during surveys undertaken under conditions of high solar activity.459 208 - PublicationRestrictedMagnetic Repeat Station Network in Italy and Magnetic Measurements at Heliports and Airports(2006)
; ; ;De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Dominici, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ;Rasson, J. L.; Institut Royal Météorologique de Belgique, Dourbes, Belgium ;Delipetrov, T.; Department of Geology and Geophysics, Faculty of Mining and Geology, 2000 Štip, Macedonia; The Italian Magnetic Network is composed of 114 repeat stations and its last complete measurement took place in the period 1999-2001, i.e. centred at epoch 2000. Mathematical models and maps were produced for declination, horizontal and vertical components, together with the total intensity of the geomagnetic field. By the end of 2005 the Magnetic Network measurement will be repeated again completely. To the Italian sites have been added also 11 other stations in Albania . Those were measured in 2004 with the collaboration of the Albanian Academy of Science and the University of Tirana. Together with this activity also another one dedicated to airports or heliports measurements has been undertaken. This kind of measurements has the objective to provide absolute magnetic knowledge of the magnetic declination in airports and heliport swinging roses where it is possible then to calibrate aircraft compasses.142 29 - PublicationOpen AccessGeomagnetic Activity at Lampedusa Island: Characterization and Comparison with the Other Italian Observatories, Also in Response to Space Weather Events(2021-08-06)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Regular automatic recordings of the time series of the magnetic field, together with routine manual absolute measurements for establishing dynamic baselines at Lampedusa Island—south of Sicily—Italy (geographic coordinates 35°31′N; 12°32′E, altitude 33 m a.s.l.), show a signature of very low electromagnetic noise. The observatory (provisional IAGA code: LMP) lays inside a restricted and remote wildlife reserve, far away from the built-up and active areas of the island, which at present is the southernmost location of the European territory for such observations. The availability of high-quality data from such site, whose survey started in 2005, is valuable for filling the spatial gap due to the lack of observatories in the whole south Mediterranean and North African sectors. We compare observations at Lampedusa, in both time and frequency domains, with those at the other Italian observatories (Castello Tesino and Duronia-L’Aquila), operating since the 1960s of last century, allowing us to report even the secular variation. Using data recorded in the last few years, we investigate higher frequency variations (from diurnal to Pc3-4 pulsations) in order to magnetically characterize the Italian territory and the local response to external forcing. In particular, we present a characterization in terms of diurnal variation and its seasonal dependence for the three observatories. This latter feature is in good agreement with a geomagnetic Sq-model, leading us to speculate about the position of the north Sq-current system vortex and its seasonal displacement with respect to the geographic positions of the observatories. We also study the geomagnetic individual response to intense space weather events by performing Superposed Epoch Analysis (SEA), with an ad-hoc significance test. Magnetic responses in the Ultra Low Frequency range (ULF) from spectral, local Signal-to-Noise Ratio (SNR) analyses under different local time, and polarization rates are computed. These latter studies lead us to search for possible signatures of magnetic field line resonances during intense space weather events, using cross-phase multi-observatory analysis, revealing the promising detection capability of such technique even at low latitudes. The geomagnetic observatories prove to be important points of observation for space weather events occurring at different spatial and time scales, originating in both upstream and ionospheric regions, here analyzed by several well-established methodologies and techniques. The quiet environmental site of LMP, providing high-quality geomagnetic data, allows us such investigations even at inner Earth’s magnetospheric shell.397 20 - PublicationOpen AccessYearbook magnetic results 2017 Geomagnetic observatory of Castello TesinoCastello Tesino observatory is one of the three geomagnetic observatories in Italy operated and maintained by the Istituto Nazionale di Geofisica e Vulcanologia. The observatory is located near the homonymous town, 55 km East from the city of Trento (Northern Italy). Castello Tesino Observatory has been working almost continuously since 1964 and it is the main Northern Italy magnetic observatory. Data from this observatory are used to study the temporal trend of the geomagnetic field in Northern Italy and to reduce magnetic field data obtained during magnetic surveys to the same period (http://roma2.rm.ingv.it/it/risorse/rete_magnetica_italiana/36/cartografia_magnetica_nazionale). This yearbook presents the results of the magnetic measurements carried out at this observatory during 2017.
93 111 - PublicationRestrictedThe Hungarian Magnetic Network and the Processing of the Obtained Data(1999)
; ; ; ; ; ;Kovács, P.; Eötvös Loránd Geophysical Institute, H-1440 Budapest, POB 35 Hungary ;Körmendi, L.; Eötvös Loránd Geophysical Institute, H-1440 Budapest, POB 35 Hungary ;Hegymegi, L.; titute, H-1440 Budapest, POB 35 Hungary ;Chiappini, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Dominici, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; In 1994-95 a geomagnetic survey was carried out on the territory of Hungary and the neighbouring regions on 195 stations. Magnetic declination, inclination and total field were directly observed. Some of the stations were measured jointly with Istituto Nazionale di Geofisica (ING), Roma. The results were reduced to the epoch of 1995.0. Normal fields for the magnetic components were determined as second order functions of the geographic coordinates. The polynomial coefficients have been computed in three different waves: by means of simple and weighted least squares procedure and using the adjustment according to "most frequent value". In the present paper the mathematical foundation of these methods and the comparison between the obtained results will be presented.222 29 - PublicationRestrictedBasin deformation due to laccolith emplacement at Radicofani (Southern Tuscany, Italy)The Radicofani basin (Southern Tuscany), developed during regional extension, is mainly filled by a mio-pliocene clastic sequence. During Early Pleistocene, the Radicofani spatter cone formed in the centre of the basin. A broad anticline, whose formation was previously associated with both extensional and compressional tectonics, is present within the basin. In order to better define the anticline, we collected field, seismic and magnetic data. Field work constrained the surface geometry of the anticline, showing that the Radicofani vent is located along the trace of its axial plane. Seismic lines are consistent with field data and show a progressive decrease in the dip of the anticline layers towards the bottom of the Neogene succession. The measured magnetic field shows a systematic relationship with the anticline, suggesting the association with a buried magnetic body. The matching of these data suggests that the anticline is the result of the emplacement of a laccolith within the Radicofani basin, possibly related to the magmatic activity responsible for volcanism at Radicofani.
156 5 - PublicationOpen AccessIl nuovo manuale degli osservatori geomagnetici(2016)
; ; ; ; ; ; ; ; ; Il nostro pianeta è sede di un campo magnetico generato principalmente da correnti elettriche di origine interna alla Terra, che fluiscono nel nucleo esterno fluido, a cui si sovrappone un contributo dovuto a correnti elettriche presenti nella ionosfera e nella magnetosfera. Oggi sono sempre più numerosi i siti permanenti di misura del campo magnetico terrestre, sia per il crescente interesse in questo settore scientifico, che apporta importanti e autonomi contributi alle altre discipline della geofisica, che per la maggiore disponibilità di strumentazione, tecnologicamente migliorata e miniaturizzata a costi ridotti. I geomagnetisti hanno un interesse particolare allo studio del campo magnetico terrestre poiché nella magnetosfera si innescano una serie di fenomeni ancora poco noti e per questo particolarmente attraenti. Sulla scia di questo interesse sono stati installati molti punti di osservazione, gli osservatori geomagnetici, dove effettuare misure di campo magnetico con continuità e per lunghi intervalli temporali. Anche l’Italia rientra in questa tradizione. Già nel 1958, con il Prof. Franco Molina, veniva installato il primo osservatorio geomagnetico moderno su suolo italiano, a Preturo, a pochi km da L’Aquila. Oggi l’Istituto Nazionale di Geofisica e Vulcanologia gestisce 3 osservatori sulla penisola e 2 in Antartide. La storia dell’evoluzione di questi siti di osservazione è lunga e ricca di aneddoti e fatti interessanti. In questo manuale gli autori vogliono fare il punto della situazione su quello che gli osservatori geomagnetici sono oggi (settembre 2016) in Italia. Vengono descritti brevemente gli osservatori, la strumentazione ivi installata e alcune accortezze messe a punto negli anni per gestire al meglio la strumentazione. Questo manuale non può certamente essere esaustivo, né tantomeno pretende di ricostruire interamente la storia dei nostri osservatori, che pure sarebbe interessante. Si vuole lasciare una traccia dello stato dell’arte riassumendo in particolare il percorso seguito in questi ultimi due anni di lavoro, dando così uno strumento a chi lavora e lavorerà presso gli osservatori gestiti dall’INGV. Gli autori ci tengono a sottolineare che il lavoro svolto presso gli osservatori è portato avanti da un gruppo di persone costituito da personale ricercatore, tecnologo e tecnico. Il contributo di tutti è stato ed è fondamentale per la realizzazione e la manutenzione di tutto quello che oggi abbiamo a disposizione.138 561 - PublicationOpen AccessIlalian Magnetic Network at 1985.0The new national geomagnetic network of repeat stations for total field F, horizontal component H, vertical component Z and declination D, has been repeated in the frame of a collaboration between Istituto Nazionale di Geofisica and Istituto Geografico Militare Italiano. From the observed magnetic elements all repeat stations values were referred to 1985.0 and normal fields, in the form of a 2nd order polynomial in latitude and longitude, were computed. All geomagnetics maps published previously have been updated at 1985.0 and are published here with the secular variation pattern. An overview of all work, including a brief history of the recent Italian geomagnetic measurements, new normal fields coefficients and secular normal fields, are presented here.
115 48 - PublicationOpen AccessItalian magnetic network and geomagnetic field maps of Italy at year 2010.0(2011-05-09)
; ; ; ; ; ; ; The 2010 survey started in September 2009 and was concluded in November 2010. In this period of time Istituto Nazionale di Geofisica e Vulcanologia (INGV) has made measurements on the national repeat station network and also repeated some measurements outside Italy. This was the case for 11 repeat stations in Albania, in collaboration with the National academy of the Sciences of Albania and with the university of Tirana, and on 3 repeat stations in Corsica, thanks to the information furnished by the Institute de Physique du globe de Paris (IPGP). Moreover INGV made 1 new measurement in the island of Malta.62 61