GEOPHYSICAL OBSERVATORY REPORTS, YEAR 1974 - NAGYCENK GEOPHYSICAL OBSERVATORY (Sopron, 1975)
1974
PREFACE This report continues the series of reports on the observation data of the Geophysical Observatory Nagycenk. The first four of them came out in the publication Acta Technica Hungarica; all the others in separate booklets. Here it is worth noting — to sum it up briefly — that the Reports of 1957—1960 comprise the data of the earth current records only. The geomagnetic data were first given in the Report on 1961. In 1962 the observation network was completed by records of the atmospheric electric potential gradient and the point discharge, so that from 1962 on these data have also been published in the Reports. From 1967 on the measurement data of the ionospheric absorption are given as well. Exchange copies of the Reports may be obtained from the Geodetical and Geophysical Research Institute of the Hungarian Academy of Sciences (H—9401 Sopron, Pf. 5. Hungary). J. Somogyi Director