S U M M A R Y This paper gives a new method for automatic calculation of K-indices by computer. The general philosophy of the method is the simulation of the hand-scaling procedure. The simple theory, based on the least-squares method with additional limitation of the second derivatives, is outlined. The method has two steps; in the second step the weighting factors are introduced to avoid errors connected with large variations. We call this method the Adaptive Smoothing (AS). The method was applied to data from three observatories, Belsk, Nurmijarvi and Sodankyla, for the period 1985 January 1 to 1986 February 28. The agreement with results from the hand-scaled method was 75-84 per cent. The percentage of the differences larger than one unit was less than 0.3 per cent.
A large‐scale international electromagnetic experiment has been carried out in northwest Poland and northeast Germany. The main goal was to study the deep conductivity structure across the Trans‐European Suture Zone, which is the most prominent tectonic structure of Phanerozoic age in Europe. Electromagnetic measurements were carried out mainly along seismic profiles P2, LT‐7, and LT‐2 crossing the suture zone and running in the northeastern direction. Strike and dimensionality analyses indicate that a geo‐electrical strike of N60°W common to both profiles LT‐7 and P2 can be estimated. This strike direction was used to project and rotate all transfer functions and both profiles were subjected to 2D inversion using three different approaches. The results show the presence of highly conductive Cenozoic‐Mesozoic sedimentary cover reaching depths up to 3 km. A significant conductivity anomaly beneath the central part of the TESZ, called the Central Polish Anticlinorium, has been well resolved at mid‐crustal depths. The upper mantle of the Precambrian East European Craton is more resistive than, adjacent to the West, the younger Paleozoic Platform.
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