Studies of local and global electrical currents in the atmosphere

Projektinformationen

ID Finanzhilfevereinbarung: INTAS-94-1054

Projekt abgeschlossen

Startdatum 1 September 1995

Enddatum 28 Februar 1998

Finanziert unter

• International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993-

Gesamtkosten

Keine Daten

EU-Beitrag

€ 30 000,00

Koordiniert durch

Uppsala University
Sweden

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Verwertbare Ergebnisse

Studies of local and global electrical currents in the atmosphere

The investigations performed in the framework of the project allowed us: a. -to conduct the series of measurement campaigns at the network of geophysical observatories; b.-to develop the new approach of electrohydrodynamic (EHD) description of electric processes in weakly conducting media as applied to the atmosphere:c.- to apply the computing modelling to the study of electrical state of the lower troposphere. The following results have been obtained: a.- Local data banks of electric field and vertical electric current measured with high time resolution in several locations, b, A quantitative model of the turbulence induced variations of the signal of a long-wire antenna and the method for estimation of the level of turbulence-induced variations using the micrometeorological data. c.- Preliminary quantitative models and estimates of ionospheric effects realised through atmospheric electrical mechanisms in the lower atmosphere. Two measurement campaigns have been fulfilled according to the Project Work Programme in May June of 1996 and from March 1997 to December 1997. The results of these experiments, concentrated in local data banks, would be serve as the foundation of comprehensive database Lit the Geophysical Department of Finish Meteorological Institute and in the Internet, which must be the subject of united efforts of Contractors in the forthcoming new project. The main instrument for theoretical investigation of atmospheric electric phenomena in the framework of this Project has been electrohydrodynamics (EHD) of' weakly conducting medium. EHD approach has been proved to be a powerful method for the analysis of wave perturbations, turbulence, instabilities and structures in the atmosphere. The turbulent electric dynamo problem has been formulated and studied. The studies of electrode effect in the surface atmospheric layer have been advanced.