Italian magnetic network and geomagnetic field maps of Italy at year 2010.0

Paper type: 
Poster

ITALIAN MAGNETIC NETWORK AND GEOMAGNETIC FIELD MAPS OF ITALY AT YEAR 2010.0

 

G. Dominici, A. Meloni, A. Di Ponzio, M. Miconi

Istituto Nazionale di Geofisica e Vulcanologia,Vigna Murata 605, 00143 Roma, Italy,

email: guido.dominici@ingv.it

 

 

Starting from the end of nineteen hundred 80s, the National Institute of Geophysics and Volcanology (INGV) has systematically undertaken the task of making measurements of the Earth’s magnetic field in Italy. In Italy, both for tradition and to preserve a detail that can tag along the peculiar geometric shape of our peninsula and islands, a grid of around 110 points called the first order repeat stations, with an average spacing around 55-60 km, is in operation. In these points the  measurements are repeated regularly, every 5 years. In the frame of a collaboration between I.N.G.V. and Istituto Geografico Militare (I.G.M.), a survey of 131 repeat stations of the Italian Magnetic Network (including 2 Observatories, 11 stations in Albania, 3 stations in Corsica and 1 in Malta) was carried out between 2009 and 2010 with the main purpose of elaborating magnetic cartography. We describe the characteristics of magnetic first and second order network, the magnetic measurements and reduction procedure. We report, in accordance with the recommendations of MagNetE Committee, new repeat station data list reduced at hour 02  for the day of measure and reduced at 2010.0. For what concerns the normal field computation for the Italian region, an analytical expression of second order degree polynomial type, in latitude and longitude, was chosen: we determined, for all elements, the coefficients of expression of normal fields at 2010.0 and for secular variations in the period 2005-2010. The new maps for Italy, for D, F, H and Z at the year 2010.0, are drawn with graphic contouring programs shortly explains. 

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