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EIL-08 Geoelectromagnetic studies of the Earth?s crust and mantle

Ionospheric magnetic sources and long term transfer function monitoring

Paolo Palangio, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Giovanni Santarato, Università degli Studi di Ferrara (Italy)
Cinzia Di Lorenzo, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Lucia Santarelli, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Elisabetta Lampis, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Manuele Di Persio, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
 

Among the objectives of the MEM Project (Magnetic and Electric Field Monitoring) there is the study of the relation between the Earth conductivity structure and the magnetic transfer function related to geodynamical processes. In the long term monitoring of the anomalous lateral variations in geological conductivity associated to local seismic phenomena we noted some time dependent features of the TF not correlated with subsoil changes. Several causes could influence the time changes in the magnetic transfer function components, for example the geometry of the sources and the spectral content changes.

In the present study we have been analyzed the problem of ionospheric magnetic sources in order to consider the long term transfer functions time coherence. Our analysis shows that when the source is "seen" from the Earth close to the vertical direction at a certain band of frequency the magnetic transfer functions have a good time coherence.