http://hdl.handle.net/2122/234 Ricerca nel canale cerca http://www.earth-prints.org/simple-search http://hdl.handle.net/2122/6031 Titolo: A new station for monitoring electromagnetic fields in Duronia (Italy): experimental setup and first results<br/><br/>Autori: Palangio, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Masci, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Di Persio, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Di Lorenzo, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Lampis, E.; Geomagnetic System, Italy<br/><br/>Abstract: Since the end of 2007 a new electromagnetic field monitoring station has been in operation in Central Italy in thearea of a village called Duronia. The station was created in the framework of the MEM (Magnetic and Electricfields Monitoring) Project composed of a team headed by the Abruzzo region. The main target of the MEM Projectis to create in the Adriatic Area a network of observatories to monitor the environmental electromagnetic signalsin the frequency band from 0.001Hz to 100kHz (ULF-ELF-VLF). The peculiarity of the Duronia installationis the low electromagnetic background noise of the site and the low noise of the instrumentation. Here we showthe experimental setup, with a brief discussion on the installed instrumentation and on the preliminaresults obtainedin the first months of operation. The research activity is mainly focused on the analysis of the spectral structureof the Schumann Resonance in the range of frequencies [5.0-35.0]Hz, and the Ionospheric Alfvén Resonatorin the range of frequencies [0.1-7.0]Hz and their evolution in time. Another target concerns the long-term monitoringof local magnetic field anomalies possiblelated to the local geodynamical processes. Thu, 01 Oct 2009 00:00:00 GMT http://hdl.handle.net/2122/5832 Titolo: Three years continuous record of the Earth's magnetic field at Concordia Station (DomeC, Antarctica)<br/><br/>Autori: Chambodut, A.; EOST, France; Di Mauro, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Schott, J.-J.; EOST, France; Bordais, P.; IPEV, France; Agnoletto, L.; ENEA, Italy; Di Felice, P.; ENEA, Italy<br/><br/>Abstract: The magnetic observatory deployed at DomeC, Antarctica, in the French-Italian base known as Concordia has now been permanently running for more than three years. This paper focuses on these long-term results which are more relevant for an observatory intended to provide absolute values of the field. The problems which emerged in this fairly long record are discussed and solutions suggested to upgrade the observatory to the standards of an absolute one (i.e. Intermagnet standards). Sun, 01 Feb 2009 00:00:00 GMT http://hdl.handle.net/2122/5167 Titolo: Geomagnetic jerks in the polar regions<br/><br/>Autori: Tozzi, R.; 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<br/><br/>Abstract: The occurrence of geomagnetic jerks over the Arctic and Antarctic regions is here investigated. Maps of geomagnetic secular acceleration over the polar regions are produced from the CM4 and CHAOS models and the occurrence of geomagnetic jerks is associated with jumps in secular acceleration. The obtained results confirm that in Antarctica geomagnetic jerks systematically follow geomagnetic jerks in the Arctic region with a time delayfrom one to three years. Evidence is found of an abrupt change in secular acceleration in both polar regions around 1985, suggesting that the 1985 local jerk could actually be a worldwide event. Combining our results with the results previously obtained on the occurrence of a geomagnetic jerkat low-mid latitudes around 2003, we support the hypothesis of a global extension of an event occurred at the beginning of the 21st century. Sat, 08 Aug 2009 00:00:00 GMT http://hdl.handle.net/2122/4418 Titolo: Three years continuous record of the Earth's magnetic field at Concordia station (DomeC, Antarctica)<br/><br/>Autori: Chambodut, A.; EOST, Strasburg, France; Di Mauro, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Schott, J.-J.; EOST, Strasburg, France; Bordais, P.; IPEV, France; Agnoletto, L.; Enea, Italia; Di Felice, P.; Enea, Italia<br/><br/>Abstract: The magnetic observatory deployed at DomeC, Antarctica, in the French-Italian base known as Concordia base, is now permanently running for more than three years. This paper focuses on these long-term results which are more relevant for an observatory intended to provide absolute values of the field. The problems which came up in the light of this fairly long record are discussed and solutions suggested in order to upgrade the observatory to the standards of an absolute one (i.e. Intermagnet standards). Tue, 01 Jan 2008 00:00:00 GMT http://hdl.handle.net/2122/4201 Titolo: The new Italian Geomagnetic Observatory of Duronia: experimental setup and first results<br/><br/>Autori: Palangio, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Masci, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Di Persio, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Di Lorenzo, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Lampis, E.; Geomagnetic System, Italy<br/><br/>Abstract: Since the end of 2007 a new geomagnetic observatory is in operation in Central Italy in the area of the village of Duronia (41°39’N, 14°28’E, 910m a.s.l.). The observatory has been created in the framework of the MEM (Magnetic and Electric fields Monitoring) Project. The main target of the MEM Project is to create in Central Italy a network of observatories to monitoring the environmental electromagnetic signals in the frequency band from 0.001Hz to 100kHz (ULF-ELF-VLF). Actually the network consists of two observatories, L’Aquila (42°23’N, 13°19’E, 682m a.s.l.) and Duronia. Next year a third observatory will be activated in Central Italy. Moreover, in the future we plan to widen the network in the Adriatic area, creating two new observatories in the other countries of the MEM partners. The peculiarity of the Duronia’s Observatory is the low electromagnetic background noise of the site and the low noise instrumentation used for the measurements. These characteristics allow us to plan new research activities in the field of the geomagnetic sciences. Here we show the experimental setup of the observatory with a brief discussion of the installed instrumentation. Moreover, some examples of the scientific results obtained in the first months of operation are shown. The new research activity is mainly focused on the analysis of the spectral resonance structure, and its evolution in time, of the Schumann Resonance in the range of frequencies [5.0-35.0]Hz, and the Ionospheric Alfvén Resonator in the range of frequencies [0.1-7.0]Hz. Another research activity of the observatory concerns the long term monitoring of local magnetic field anomalies, to underline their possible correlation with the geodynamical processes. Tue, 01 Jan 2008 00:00:00 GMT http://hdl.handle.net/2122/4071 Titolo: Are we going towards a global planetary magnetic change?<br/><br/>Autori: De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Qamili, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia<br/><br/>Curatori: De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Baker, R.; Israel Institute of Technology, Israel; Klug, B.; Univ. of Natural Res. & Applied Life Sciences, Austria; Vanicek, P.; University of New Brunswick, Canada; D'El-Rey Silva, L. J. H.; Universidade de Brasilia, Brazil; Foyo, A.; University of Cantabria, Spain; Ercanoglu, M.; Hacettepe University, Turkey; Dordevic, D.; University of Belgrade, Serbia<br/><br/>Abstract: The dipolar part of the geomagnetic field has been decaying rapidly during the last few hundreds of years. In addition to this classical argument, from Information theory applied to geomagnetism, there are some evidences that the recent Earth magnetic field is showing characteristics typical of a reversal in progress. If this is true, many scientific and environmental questions will arise. For instance, it will be of particular interest to monitor the time-space dynamics the South Atlantic Anomaly, where the magnetic field is strongly reduced (a sort of "planetary magnetic hole"). Here we find one of the most favourite places where Low Earth Orbiting (LEO) satellites are lost or present some damages, due to the vicinity of "clouds" of electric particles (Van Allen belts) to the Earth's surface. The decay of the field will also decrease the screening effect to the solar wind and cosmic charges, so enhancing the cosmic radiation illuminating our planet: possible negative consequences are expected in terms of increase of skin cancers. Also important will be the study of the possible evolution of the core dynamics that will be generating this specific condition of the geomagnetic field. Thu, 11 Sep 2008 00:00:00 GMT http://hdl.handle.net/2122/4070 Titolo: Environment and Geoscience<br/><br/>Autori: De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Baker, R.; Israel Institute of Technology, Israel; Klug, B.; Univ. of Natural Res. & Applied Life Sciences, Austria; Vanicek, P.; University of New Brunswick, Canada; D'El-Rey Silva, L. J. H.; Universidade de Brasilia, Brazil; Foyo, A.; University of Cantabria, Spain; Ercanoglu, M.; Hacettepe University, Turkey; Dordevic, D.; University of Belgrade, Serbia<br/><br/>Curatori: De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Baker, R.; Israel Institute of Technology, Israel; Klug, B.; Univ. of Natural Res. & Applied Life Sciences, Austria; Vanicek, P.; University of New Brunswick, Canada; D'El-Rey Silva, L. J. H.; Universidade de Brasilia, Brazil; Foyo, A.; University of Cantabria, Spain; Ercanoglu, M.; Hacettepe University, Turkey; Dordevic, D.; University of Belgrade, Serbia<br/><br/>Abstract: This book contains the proceedings of the 1st WSEAS International Conference on Environmental and Geological Science and Engineering (EG'08) which was held in Malta, September 11-13, 2008. This conference aims to disseminate the latest research and applications in Renewable Energy, Mineral Resources, Natural Hazards and Risks,Environmental Impact Assessment, Urban and Regional Planning Issues, Remote Sensing andGIS, and other relevant topics and applications.The friendliness and openness of the WSEAS conferences, adds to their ability to grow byconstantly attracting young researchers. The WSEAS Conferences attract a large number of well-established and leading researchers in various areas of Science and Engineering as you can see from http://www.wseas.org/reports. Your feedback encourages the society to go ahead as youcan see in http://www.worldses.org/feedback.htmThe contents of this Book are also published in the CD-ROM Proceedings of the Conference.Both will be sent to the WSEAS collaborating indices after the conference:www.worldses.org/indexesIn addition, papers of this book are permanently available to all the scientific community via the WSEAS E-Library.Expanded and enhanced versions of papers published in this conference proceedings are also going to be considered for possible publication in one of the WSEAS journals that participate in the major International Scientific Indices (Elsevier, Scopus, EI, ACM, Compendex, INSPEC, CSA .... see: www.worldses.org/indexes) these papers must be of high-quality (break-through work) and a new round of a very strict review will follow. (No additional fee will be required for the publication of the extended version in a journal). WSEAS has also collaboration with several other international publishers and all these excellent papers of this volume could be further improved, could be extended and could be enhanced for possible additional evaluation in one of the editions of these international publishers. Finally, we cordially thank all the people of WSEAS for their efforts to maintain the high scientific level of conferences, proceedings and journals. Thu, 11 Sep 2008 00:00:00 GMT http://hdl.handle.net/2122/3978 Titolo: A discussion of the uniqueness of a Laplacian potential when given only partial field information on a sphere<br/><br/>Autori: Lowes, F. J.; Physics Department, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK; De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Duka, B.; Faculty of Natural Sciences, Department of Physics, University of Tirana, Tirana, Albania<br/><br/>Abstract: For a vector field defined by a scalar potential outside a surface enclosing all thesources, it is well known that the potential is defined uniquely if either the potentialitself, or its derivative normal to the surface, is known everywhere on the surface.For a spherical surface, the normal derivative is the radial component of the field; the horizontal (vector) component of the field also gives uniqueness (except for any monopole contribution). This paper discusses the way other partial information of the field on the spherical surface can give a unique, or almost unique, knowledge of the external potential/field, bringing together and correcting previous work. For convenience the results are given in the context of the geomagnetic field B. This is often expressed in terms of its local Cartesian components (X, Y, Z), equivalent to (-Bθ, BΦ, -Br); it can also be expressed in terms of Z and the vector horizontal component H = (X, Y). Alternatively, local "spherical polar" components (F, I, D) are used, where F = |B|, the inclination I is the angle in the vertical plane downward from Hto B, and the declination D is the angle in the horizontal plane eastward from northto H. Knowledge of X over the sphere gives a complete knowledge of the potential, apart from that of any monopole (which is zero in geomagnetism), and Y gives the potential except for any axially symmetric part (which can be provided by a knowledge of X along a meridian, or of H along any path from pole to pole). In terms of (F, I, D) the situation is more complicated; either F or the total angle (I, D) needs to be known throughout a finite volume; for the latter, this paper shows how,in principle, the actual potential can be determined (except for an unknown scalingfactor). Similarly D on the sphere also needs a knowledge of |H| on a line from (magnetic) pole to pole. We also discuss how these various properties affect the determination, by surface integration, of the Gauss coefficients of the field representation in terms of spherical harmonics. Sun, 01 Jan 1995 00:00:00 GMT http://hdl.handle.net/2122/3977 Titolo: A simple approach to the transformation of spherical harmonic models under coordinate system rotation<br/><br/>Autori: De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Torta, J. M.; Observatori de l'Ebre, CSIC, 43520 Roquetes, (Tarragona), Spain; Falcone, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia<br/><br/>Abstract: The transformation of a set of spherical harmonic coefficients characterizing a modelof the geomagnetic field, or a general function defined on a sphere, subject to a rotation of the coordinate system, is given by the direct relations between the coefficients and then by using a numerical approach. The parameters for a pair of such rotations (from one set to another, and vice versa) are given, along with a few examples of their application. The method is particularly useful for the comparison of geophysical characteristics derived from models developed under different coordinate systems. It offers a practical solution to the problem, which can be implemented without difficulty. Mon, 01 Jan 1996 00:00:00 GMT http://hdl.handle.net/2122/3970 Titolo: The first Antarctic geomagnetic Reference Model (ARM)<br/><br/>Autori: De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Torta, J. M.; Observatori de l'Ebre, Roquetes, Spain; Gaya-Piqué, L. R.; Observatori de l'Ebre, Roquetes, Spain<br/><br/>Abstract: Spherical Cap Harmonic Analysis has been applied to obtain a reference model of geomagnetic secular change for Antarctica valid for the last forty years. In this paper, we use the latest availableobservatory data to update this model and to compare it with the 8th generation IGRF. In addition, the selected set of total field values used for the generation of the Oersted Initial Field Model have been employed together with observatory data to develop the first complete Antarctic Reference Model (ARM). This model improves the fit to the secular variation deduced from observatory data by about 60% relative to IGRF, and the fit to observatory and satellite field data by 8%. The model allows merging data sets taken at different altitudes and epochs in Antarctica, where significant temporal geomagnetic variations occur. Thu, 18 Apr 2002 00:00:00 GMT