POZZO-DI-BORGO , Elisabeth

Investigation of the ultra-low frequency (ULF) magnetic pulsations, detected at mid-latitude by the underground magnetometer system [SQUID]2, is carried out in order to establish a first baseline for the "global minimal magnetic level" in the site. This study analyzes 24 quiet days, identified by the Deutsches GeoForschungs Zentrum (GFZ) as...

SQUIDs can be used to monitor the three vector components of the geomagnetic field to a high precision at very low frequencies, yet as they are susceptible to external interference, the accuracy to which they can track changes in the dc field over long periods has been unclear. We have carried out simultaneous measurements of the geomagnetic...

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On 24 November 2006, simultaneous observations of Pc5 pulsations, electron precipitation and whistler-mode chorus, as well as solar wind and IMF parameters have been analyzed based on data from IMAGE magne-tometers, riometer array and temporal VLF station. This paper focuses on the Pc5 pulsations detected at the same time, in the 1–25...

Karst systems contain important groundwater resources. Due to their complexity, they are generally under exploited. Particularly, the hydrodynamic functioning of the unsaturated zone is badly understood even if its important role is admitted Today, the hydrogeologists are agreeing with the important function(s) of the unsaturated zone in karst...

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session poster (3A-E-P-03)

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session III: Couplings: solid Earth, atmosphere and near Universe

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Each ground movement on Earth shakes the air column above it. When the acoustic wave reaches the ionosphere floor, charges are temporarily displaced, parallel to the acoustic excitation. An electric current is created giving birth to a magnetic signal. The density difference between ground and air makes the coupling very poor but this is...

One hour before the Sichuan earthquake (Mw=7.9, 2008 May 12, 06:28~TU), amplified, recurrent and well-defined ionosphere excitations at the resonance frequency of the ionosphere floor were observed by the [SQUID]2 system, an ultra low-noise magnetometer with a rejection rate better than 3fT/√Hz over 40~Hz installed within the LSBB underground...

In the millihertz range, a single magnetometer can detect magnetic waves in the near-field regime. For such long wavelengths, it can measure the world-wide magnetic-background noise due to any charge displacement on Earth and within its environment. In this frequency band, the normal modes of the Earth's free oscillations exist and when...

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High sensitivity combined with an ultra-low-noise environment [SQUID]2 magnetometer (Superconducting QUantum Interference Device with Shielding QUalified for Ionosphere Detection) allows the observation of Earth–ionosphere couplings. Namely: – identification of a mesopause resonance mode excitable by P waves or by electric field as during the...

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The physical meaning of the azimuth information provided by the ultra low-noise magnetometer instrument [SQUID] 2 is analyzed for mesopause and atmosphere electromagnetic signal sources. Consequences for a potential worldwide network of such instruments are evaluated.

The physical meaning of the azimuth information provided by the ultra low-noise magnetometer instrument [SQUID]2 is analyzed for mesopause and atmosphere electromagnetic signal sources. Consequences for a potential world-wide network of such instruments are evaluated.

National audience